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The present paper focuses on the evaluation of different methods for calculation of air change rates due to natural ventilation through windows. Such estimations are of utmost importance for the studies, in which the influence of window operation on thermal comfort, air quality and building performance is to be addressed. Especially, to build accurate building performance models and to develop reliable building simulation scenarios, it is crucial to predict proper values of air exchange. A number of standards and recent scientific contributions present various models for the estimation of air change rates, whereby different sets of input parameters related to room and outdoor conditions are needed. The current contribution examines the reliability of calculated air change rates obtained via a number of widely used estimation methods for a case study room with single sided windows. To this end, a number of tracer gas measurements in a variety of window state settings were conducted, and the real air change rates were calculated based on the measured concentration decay of the tracer gas. Consequently, using the resulting measured and calculated values of air change rates, the reliability of estimation methods could be extensively explored.

In order to improve the accuracy of hydrologic calculation of highway bridge crossing tributary, two calculation methods were listed in this paper. Based on the analysis and comparison of the hydrologic calculation of bridge design flood flow and water level at certain frequency crossing tributaries in the main river system, the hydrologic analysis of bridge is introduced. The important applications of hydrologic analysis of highway bridge community along river that need to be solved are discussed.

In this paper the authors present some theoretical and experimental research carried out during the manufacture of a rotary table for CNC machine-tools AF type. There are shown the calculation methods in static and dynamic conditions for the indexable rotary tables and also for those that operate as numerically controlled “B” axes. The calculation methods were tested by manufacturing several such tables intended for the machines belonging to AF(P)100-180 range.

Acoustic properties of building structures are currently very actual theme with regard to the development of new building and insulating materials, while the methods for estimating the airborne sound reduction index evolve mainly from the second half of the 20th century. For mutual comparison of selected prediction methods and for determination of their suitability it has been provided a calculation of weighted sound reduction index RW [dB] from the input parameters of materials identified by laboratory measurements, calculation of weighted apparent sound reduction index R ́W [dB] and these values were compared with in-situ measurements. The aim of this paper is to determine the most appropriate method to calculate RW [dB] and R ́W [dB] values of lightweight building constructions with regard to their practical applicability, accuracy of estimation and complexity of the calculations.

Ability to resist of high temperature impacts during fire is not based exclusively on ignitability of building materials. At the present time, fire resistance is declared mainly through fire tests, but numerical procedures for the determination of fire resistance also represent an effective alternative in this field. Using calculation methods for the determination of ceiling structure fire resistance on the basis of timber is subject of the submitted paper. The main objective of this paper is to demonstrate the fact that timber, or products from it, are building materials capable to resist impacts of fully developed fire for the period of more than 60 minutes in spite of their flammability. Applicability of these results in selected countries of Europe can be seen from the list of requirements.

Most of China's newly developed fighters are equipped with 28MPa hydraulic system rather than previous 21MPa hydraulic system since introduction of Russian S27 fighter production line. However, there is no truly applicable design standard guiding the sealing design of 28MPa hydraulic products in aviation applications although 28MPa hydraulic system has been applied in China's fielded fighters for quite a long time. In this article, the sealing standards both abroad and home and the sealing materials used by world-famous seal manufacturers are respectively investigated. In addition, calculation methods and allowable limits are recommended for the tensile and compression rate used in design calculation for sealing structure. All these recommended values can be referenced by sealing design engineers before China's high pressure sealing design standards are implemented.

In this paper we shall deal with application of analytical and numerical calculation methods in selected geotechnical problem. It is well-known that numerical modeling by Finite Element Method (FEM) is often used for solving complicated engineering problems. FEM is very universal and efficient tool for their solution. In our case a contact task of rigid shallow (circular, rectangular and strip) foundations loaded by centric force, has been solved. The obtained results of vertical normal stresses distributions according to analytical methods and FEM solutions have been analyzed and mutually compared. Results of the calculations have been presented in graphical and tabular form, too.

The structure of castellated beams is complex, using the computation theory of elastic flexural-torsional buckling of H-shaped beams to study the elastic flexural-torsional buckling strength of castellated beams under different loads, based on simplifying the section's eigenvalues. In addition to the theoretical investigation, the finite element analysis of the accurate critical loads of the beams had been done by the ABAQUS software, a comparison has been made between the calculated loads and analyzed results, error is smaller. Analyzing the effects that divergence ratio, depth-span ratio and distance-height ratio has on the elastic flexural-torsional buckling loads of castellated beams and draw out some reduced calculation methods for the section's eigenvalues and elastic flexural-torsional buckling critical load of castellated beams.

According to the area of water resources development and utilization of non-equilibrium phenomena, introduces the concept of water resource Gini coefficient, introduces two kinds of calculation methods of water resources in the Gini coefficient, establishes a non-equilibrium evaluation model of water resources, from the two aspects of intragenerational and intergenerational were evaluated for non-equilibrium degree and the law of development and evolvement of water resources development and utilization in the area, and to put forward the idea of water resources and social economy unbalanced development model. Through an empirical analysis of water resources Gini coefficient in Hubei province, obtained the practical achievement and conclusion.

The article deals with various optional combinations of upper and lower basins in pumped-storage power plants (PSPP) which determine ice conditions that may appear on water surfaces, headwater discharge basins and slopes basins. There are also examples of calculation methods of ice regimes that are given in this article.

Modern scientific principles of air exchange and air distribution calculations are meant in the development of calculation methods based on complex consideration of stream flows and approximative models regularity – i.e. system of heat-air balance equations compiled for specific volumes of the premise. The article defines most significant factors affecting the formation of gas, moisture and velocity fields in the premise, namely: heat emission sources, intake streams, descending convective air flows occurring near cold surfaces, heat losses (or intakes), draft ventilation (general exchange and local). Issues regarding determination of intake air volumes and distribution of the above inside the premises were considered in close interrelation with each other (i.e. principle of air exchange and air distribution conjoint calculation). Consistency of calculation methods has been repeatedly proved with physical models and in field conditions.

In the framework of ultimate state calculation methods the paper presents some propositions for stress-strain state, crack resistance analysis and failure state of reinforced concrete structures with corrosion damage at supports. The work concerns the durability of concrete and reinforced concrete elements with corrosion damage. The theory for reinforced concrete with corrosion damage is presented for plane stress state

In the traditional outage model, the failure rate of the wind turbine is often given as a long-term statistics value on average, that is only one value for a wind turbine, this calculation method is not reflect the real reliability level of wind turbines. According to historical failure data, the factors that affect the wind turbine outage are divided into several categories. Based on Markov Process, the calculation methods for wind turbine failure rate under single factor and multi-factor are given respectively. On this basis, the calculation methods for wind turbine failure rate under different levels of single factor and multi-factor are given respectively based on statistical analysis method. Because different factors are taken into account in the failure rate calculation, the failure rate will change according to the actual factors and then it could reflect the real risk level of power systems when uses this failure rate. Simulation calculation is carried out on a real wind farm; the results show the effectiveness of this proposed method.

The tension distribution of high-strength bolted extended endplate connections does not have unified regulations in china, the assuming tension distribution between the "Code for Design of Steel Structure"(GB50017-2003) and the "Specification of High Strength Bolt Connection of Steel Structures"(JGJ82-2011) are different, it may lead some problems in practical engineering. "Specification of High Strength Bolt Connection of Steel Structures"(JGJ82-2011) has given the assumed tension distribution ,but has not given formula .But its distribution assumption is the same as the British Standard ,so the calculation is given below reference to British Standard. Comparing their calculation methods and referencing to the British Standard ,the latter distribution is more reasonable.

The screen pipe completion is the predominated method for heavy oil horizontal well in Liaohe Oilfield, accounting for 83.4% of the total completions. General steam injection has been used for the horizontal wells, resulting in a better exploitation percentage in heel part but a poorer exploitation percentage beyond 1/3 of the distance from the tiptoe to heel in horizontal well. As the concentric dual-tube steam injection technique for horizontal well has just been developed in Liaohe Oilfield, the related supporting technique is not enough. In this paper, researchers consider achieving horizontal wells concentric dual-tube steam injection optimized design as main goal so that the physical model will be established, and also the calculation methods for pressure, the calculation models for quality, heat loss and tapered string parameters along the wellbore will be provided during the concentric dual-tube steam injection for horizontal wells.

The true formation thickness missed in the geologic borehole has important sense for understanding the strata of borehole and position of target layer. Nevertheless, there had not been enough effective technologies and calculation methods to calculate the missing true formation thickness at present. To solve this problem, this paper focuses on mathematical formula combining with the actual geological conditions, collects various useful geologic data and parameters, such as stratigraphic dip, dip direction, distance from drilling well to formation’s pinchout boundary along the dip direction and difference in height between drilling well and pinchout boundary, sets a reasonable calculation method, derives a complete set of new expression to calculate the missing true formation thicknesses. The typical region, YM32 Area in Tarim Basin, was taken as the case study to prove the accuracy and practicability of the calculation method. The result was inspected by the actual data of neighbor boreholes.

Based on continuum damage mechanics, by defining the initial and critical damage value, because of the plastic volumetric strain of the specimen, we established the calculation methods of the rock specimen’s damage value. Through the conventional triaxial compression test of the shale, we find that damage value D changes as axial strain changes during compression, and summarizes its variation.

Reliable construction and maintenance of buildings and structures based on weak and highly-compressive soils are closely related to artificial methods of how to prepare for foundation works. And changing a layer of weak soil in deformed foundation with a compacted soil bed consisted of various strong materials (sand, gravel, pebble-gravel, slag, production waste materials and others) can be considered as one of efficient methods. With the existing calculation methods used the dimensions of compacted beds quite often appear to be overestimated, and this results in increase in costs and working hours needed to build artificial foundation. It is more rational to create highly compacted and reinforced soil beds. The article deals with the general outcomes of experimental and theoretical research on design and foundation works of these beds which give evidence of their efficiency and explicit possibilities to expand fields of application.

Error modeling and analysis can improve the manufacturing precision and the error compensation accuracy of machine tool. According to the surface of the parts topography information, this paper puts forward a kind of error model of machine tool based on cutter contacting point vector chain. Based on analyzing the cutter contacting point of one tool path which is on the surface of the parts, Based on analyzing action rules of a single cutter contacting point error, the cumulative rules of errors and calculation methods were introduced detailedly, and an application demonstration is given.

Aiming at prestressed anchor cable frame in the presence of reinforcement landslide problem, through the selection of test points, the paper study and tested soil pressure, frame internal force and prestress losses under prestressed anchor cable frame beam, reveal the law of internal force distribution, and provides a theory basis for the rational design of prestressed anchor cable in landslide..

The paper presents an original generalization of the Lagrange equations of the second kind, for motions with respect to reference frames in arbitrary motions. The traditional form of the equations is modified by adding certain supplementary terms. Calculation methods are presented for these terms and some conclusions useful in practical applications are drawn. For validation, the new formalism is illustrated on the application of the Foucault pendulum. The results are in full agreement with those obtained by traditional methods. The formalism can be used to determine the motions of various mechanical systems, with respect to large size movable bodies (such as planets or orbital stations), that are not influenced by the relative motion of the studied parts.

It is always difficult to obtain a reliable result of helicopter mission effectiveness evaluation (HMEE) by traditional methods. In order to solve the problem, this paper compared and analysed advantages and disadvantages of traditional effectiveness evaluation methods, and presented a simulation-based helicopter mission effectiveness evaluation method. The method is based on the simulation data. The method combines with advantages of multi parameter evaluation method, computer simulation evaluation method and logarithmic evaluation method. By using the reliable helicopter flight simulation data and an objective weight coefficient calculation methods, we can get accurate and reliable helicopter mission effectiveness value. Research proves that this method can be applied in the field of effectiveness evaluation.

Changing a layer of weak soil in deformed foundation with a compacted soil bed consisted of various strong materials (sand, gravel, pebble-gravel, production waste materials). Existing calculation methods and techniques to build compacted soil beds based on weak highly compressive soils do not meet up-to-date requirements. Calculation methods used the dimensions of compacted beds quite often appear to be overestimated, and this results in increase in costs and working hours needed to build artificial foundation. The paper presents the possibility of using reinforced soil beds as an efficient method to build artificial foundation based on weak soils.

In this paper, through the comparison of elastic mechanics and material mechanics of rod research methods, understand their common and different points, advantages and disadvantages, and further clarify their respective plays an important role in engineering application.

This paper focused on five kinds of methods for water inflow of typical sections in a long deep buried tunnel under conditions of high ground stress and high water pressure (referred to as “two high conditions”). The methods are based on groundwater dynamics formulae and practical experience. Results show that calculation data by the method 5 is the maximum. There is little difference of calculation results between the formulae 1 and 2 or between the formulae 3 and 5. The calculation methods and results of the water inflow can provide prevention of gushing water of a long deep buried tunnel under the two high conditions with scientific basis.

In recent years, the application of super-long piles gradually increased, therefore the research about effective pile length is imminent. This paper summarized the meaning of effective pile length from two different points, bearing capacity and settlement. Analyzed its application and discussed the advantages and disadvantages of the various effective pile length calculation methods, it has the important guiding significance and application value to the reasonable pile length design of the present actual project.

Based on the present situation of village building adopting the internationally recognized life-cycle theory, the life-cycle calculation model of carbon emission of rural roofing materials was put forward , the calculation boundary of carbon emissions was divided and the calculation parameters and calculation formula was determined. The result shows that: under reasonable assumptions, applying life cycle theory to carbon calculation of rural roofing materials is feasible. The rural roofing materials industry by improving production process to reduce energy consumption and selecting raw material in localization as far as possible can significantly reduce carbon emissions.

Marine salvage is a key link to ensure the safety of maritime shipping. Hydraulic dilator is one of the emergency tools which are widely used in rescue. The traditional hydraulic dilators with mineral oil drive or electric dilators can hardly achieve satisfactory results in underwater salvage environment. A kind of underwater salvage dilator with seawater hydraulic drive is designed. Its main functions, structure and the calculation methods of main parameters are introduced.

This paper analyzed the formula for calculating the velocity and scatter radius of water mist droplets after detonation. Through establishing model, calculating by the formula and simulation of theoretical model, the reasons of deviation between calculation and simulation results were found out. In order to make theoretical calculation more accurate and applicable, new formula was created by introducing correction factors.

Underground continuous wall has received more and more attention in the construction field as the important part in the foundation engineering. Pointing at the deformation characteristic of continuous wall, the factors which influent the deformation of continuous including the intrinsic mechanical characteristic and time effect in the construction area. The main calculation methods and various of calculation models are concluded as well as the construction technology, which concludes the research production in the continuous wall field and pointing the direction for the following research.

In recent years, the carbon fiber reinforced plastics (CFRP) has been widely used in field of structural reinforcement. To investigate the effect of different amount of CFRP strengthening pre-stressed concrete hollow-core slabs and the capacity calculation methods, test data of six slabs reinforced with CFRP at different amount were compared to obtain a available calculation formula of flexural capacity. The results showed that the bearing capacity and ductility of these specimens are significantly improved strengthened with CFRP; the proposed method of calculation is safe, simple, practical and relatively high accuracy, the calculation results coincide well with experimental results, and it has a certain reference value for the calculation of the followed studies and practical projects.

This paper studies the micro pile technology for the accumulative landslide reinforcement of expansive soil, putting forward the three failure modes of the micro pile strengthening accumulative landslides of expansive soil and design principles of the micro pile, and then illustrating its calculation methods. Those finding have been applied into 22 landslide disasters for the micro pile design, landslide treatment engineering in south mountainous area of Shaanxi Province in China, which attaches theoretical and practical importance to the design and treatment of micro piles reinforcing the same type of landslide.

Many complex waviness defects occur during the production process of ultra wide TCMs, flatness idex I can not meet the demands of analyzing these problems. Therefore flatness pattern recognition considering cubic patterns is introduced to provide a flatness evaluation parameter. Combining the calculation methods and statistical methods of evaluation parameters, a flatness assessment system is programmed with Matlab GUI, which provides functions such as representing the flatness of previous strips, recognizing the flatness error and making statistics. After verifying of actual flatness measured value, the system is proved to be effective, which provides theoretical basis and data support for mastering the flatness quality and optimizing flatness control parameters.

By analyzing the main transformer substation operation mode change various calculation methods of loss are conducted on how to determine the economic operation mode of the double main transformer substation. According to load changes, in order to achieve best value for economy it is neccessary to reduce variable transformer loss. In this paper, a practical method of substation transfomer determination is analyzed.

For the chase tank and large opening forms of inland waterway bulk carrier, using finite element method, the whole ship finite element model is established, the total intensity strength of the overall structure is conducted an evaluation study, the stress and strain distribution of the whole ship is obtained. The calculation methods of the entrained water quality is studied, and the entrained water quality is calculated by the method of Lewis and Todd, on this basis, the dynamic characteristics of the whole ship are calculated, the vibration characteristic of the whole ship is got, data is provided the support For the study of the important parts of inland waterway bulk carrier, and it is provided a certain reference for the design studies of inland waterway bulk carriers.

When analyzing the inner bending force and drawing the inner force,students often have confusion and make mistakes on the positive and negative values of the inner force.Based on the method of the symbols prescribed by the relevant teaching materials,I summed up a set of method easy to understand.Combining the living examples,this paper elaborated the simple regulation of the positive and negative rules of the internal force and calculation methods on the basis of method of sections.

The tree-like structure is a branch of space bionic structures,belonging to the Bionic Architectural Structures. Cast-steel joints with branches are the keys to build the tree-like structures.They are used widely,and the most common joints in our projects are cast-steel joints with two、three and four branches. The cast-steel joints with two branches are planar,while the joints with three and four branches are spatial.Until now,the basic theoretical researches about the cast-steel joints with branches are also relatively scarce.This paper did researches about mechanical properties, calculation methods and structural optimization of the cast-steel joints with three branches deeply and systematically. The result shows that the bending moment has a big influence on the value of the max stress. And the three main failure modes of the cast-steel joint with three branches are yield of the main tubular along the axial direction, local buckling at the connection of the main tubular and branches, and the tearing out of the branches.

In this paper, we present an efficient approach based on Smoothed Particle Hydrodynamics (SPH) to simulate nearly incompressible fluids. The proposed method is an extension of the traditional SPH method designed for compressible fluids. We first introduce a new scheme for pressure evaluation to satisfy the incompressibility constraints. Then novel calculation methods for pressure force and viscosity force are discussed. Finally, the results demonstrate that our method is more capable of realistically simulating fluids with near-incompressibility than previous method.

When there is a ramp, the methods of calculating the foundation and pile bearing capacity are different from the plains situation. Many scholars have been studied determination method of the foundation and pile bearing capacity under the condition of slopes. A program is developed based on the results of previous studies, which can calculate the foundation and pile bearing capacity under the condition of slopes. The program using MATLAB software integrates a calculation method of foundation and pile capacity under slope condition. Combined with numerical examples, the results illustrate the upshots of the calculation methods in the program on the basis of the literature by interpolation method with the adjustment coefficients are accurate. And analyzed the influence of slope ratio on the bearing capacity: capacity and slope ratio was negatively correlated, with the slope ratio decreases, the capacity is on the increase, but the degree of increase based on the slope ratio.

Based on the principle of featured through-current area being constant, calculation model for parameters of regenerative steam extraction of CHP unit in different heating conditions is developed in this paper through using FROTRAN software. The generated output and thermal economy of the CHP unit are calculated by using the method of equivalent enthalpy drop, and the accuracy of the model is verified. With the purpose to analyze the rationality of different calculation methods, the distribution ratio of coal consumption for heat supply and coal consumption rate for power generation are calculated through method of equivalent enthalpy drop, heat quantity method and method of actual enthalpy drop under the same operating condition. Moreover, according to the operation test on the unit, the highest and lowest generated output of the CHP under various loads of heat supply are determined, which will provide a basis to the subsequent thermoelectric units in participating in peak shaving of power grid.

Calculation methods of standard deviation in Up-and-Down method, which are traditional method and modified method of GJB/Z 377A-1994, are analyzed by Monte Carlo simulation, and estimation accuracy of standard deviation is improved by combining traditional method with modified method,which is called combinative method. It shows that estimation accuracy of traditional method is more precise than modified method with any sample size. Estimation accuracy of combinative method is better than other two methods when sample size is between 26 and 39, while has the same estimation accuracy as traditional method in the other sample size,and the optimumvalue of a is given.

This paper is study on the 330MW Double-extraction unit, made by Dongfang Steam Turbine Works manufactured, and the reference conditions of the unit was calculated. Thermal system analysis and calculated of double-extraction unit based on the equivalent enthalpy drop and variable condition calculation methods, and double-extraction steam turbine dynamic characteristics analysis model is established through a series of dynamic characteristics. The result showed that the smaller error between the calculated value and the design value of this model, and it can be applied to single extraction and condensed various working conditions. In addition, four variables of the unit main steam flow, low-pressure extraction flow, medium pressure extraction flow and electric power was fitted, resulting in multi-characteristic equation, which provides a theoretical basis for the follow-up study online load distribution.

Three radiation models are discussed in the present paper. The heat fluxes vary considerably between different methods. In all models, fluxes vary highly on the position of nearing the flame and are almost identical on the far away position. Heat fluxes calculated from point source model is less than other two models, and Shokri-Beyler model is highest. Shokri-Beyler method is most applicable at heat fluxes greater than 5 KW/m2 and recommended in engineering design, and Mudan model is not applicable for calculating the heat flux nearing the flame.

With the detailed force analysis of spiral spline transmission, the relationship of each force was derived. On the basis of this, referred to the designing and checking criterion of the straight-tooth spline transmission and spiral transmission, the calculation methods of the surface extrusion stress (or pressure) of the spiral spline teeth side, the shear stress and the max-flexural stress of the spiral spline teeth root, and the equivalent stress of the screw bolt were derived, and the checking criterions for them were put forward. An example, the surface extrusion stress through the calculation methods compared with that through ANSYSWorkbench simulation, verifies the calculation methods of the surface extrusion stress (or pressure) of the spiral spline teeth side.

In building structure, staircase is more complex and relatively weak. As an important emergency routes when earthquakes and other emergencies (such as fire, explosion, etc.) take place, stairs subject highly evacuation live or seismic load, destruction of the stair caused delay of evacuation and affected the commencement of rescue work, and produced serious injury or death. Investigation of Wenchuan earthquake damage also finds that many stairs broken before the main structure. In the current code for seismic designof building, seismic design advice of stairs was only given instructionally, and specific calculation methods and construction requirements were lacked. Based on the analysis of earthquake destroy of stairs in frame structure, this paper proposes some design requirements of stair.

The calculations of plan truss and beam-girder method on straight bridge were analyzed, which determined right beam-girder method calculation model of the box-girder bridge. Based on this model, the different radius continuous curved box-girder bridges were simulated by finite element, and then the internal forces of the bridge were obtained. The calculations of inner beam and outer beam show the change rule of internal force and bridge radius. The reasonable calculation methods of continuous curved box girder bridges are obtained, which can offer help to the bridge designers.

In the operation of the hydropower units, it often come across condition changes such as start-up, normal stop, increase or decrease the load and load rejection. This will cause the hydraulic transient process of the water power generation system, which is of great significance to the safe and stable operation of hydropower station. This paper analyzes the method to calculate the transient process of hydropower unit and expounds the principle of all kinds of calculation methods and steps to lay a foundation for further optimization study.

A virtual material model of joint interfaces was established based on the Hertz contact theory and fractal theory, this model was improved by considering the influence of the elastic-plastic deformation of asperities and ameliorating the calculation methods of the elastic modulus. The simulation results of elastic-plastic considered and elastic-plastic unconsidered were compared, moreover, the finite element simulation results and experimental results were compared to fully explain the necessity of considering the influence of the elastic-plastic deformation and the the correctness of the method to calculate the elastic modulus. The research suggested that under a same load the elastic modulus of the model considering the influence of the elastic-plastic deformation was slightly larger than the un considering one, which means it could describe the characteristics of joint interfaces more accurately.

The synthetic efficiency of hydroturbine is the foundation and important basis of economic operation of hydropower plants. However, the traditional calculation methods have large amount of calculation, large errors and other problems. To solve the problems better, this paper introduces the Elman neural network and BP neural network to calculate the synthetic efficiency of hydroturbine. Comparing the results of the Elman neural network and the traditional BP neural network, the result shows that, Elman neural network is an effective way to improve the learning speed, effectively suppress the minimum defects that the traditional neural network is easily trapped in, and reduce the error. The result suggests that the Elman neural network has better nonlinear mapping capability than the BP neural network.

In order to analyze the influence rule of water pipe cooling on the temperature field and thermal stress of large aqueduct structure, the finite element analysis model for FuYang River Aqueduct structure was established. The temperature field and thermal stress of the aqueduct structure were calculated. The following two cases were considered: structure with or without water pipe cooling, as well as the different beginning pouring months (May, June and July). The hydration-degree-based calculation methods of temperature and stress of concrete were adopted, and the high precision discrete simulation method of water pipe was used. The calculation results show that embedding the cooling pipe in concrete can effectively reduce the temperature difference between inside and outside of the early concrete and thermal stress, and is therefore effective to prevent concrete cracks. High accuracy of simulation and analysis can make people basically figure out the specific mechanism of concrete cracking and main factors even before construction, and determine accurately the structure crack location and the developing tendency.