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In order to investigate the ultimate load capacity of K-type tube-gusset plate connections with stiffened plate, the static tests of five full-scale specimens were conducted in this study. The results indicate that the end stiffened plate is critical for improving the load capacity of the connections. In addition, the parametric nonlinear finite element analysis of the K-type tube-gusset plate specimens was performed with account of such non-dimensional parameters as chord diameter-to-thickness ratio (γ), plate width-to-chord diameter ratio (α), plate thickness-to-chord thickness ratio ( $$\tau_{1}$$ ), stiffened plate thickness (td), and nominal-to-yield stress ratio (η). The above analysis implies that the ultimate load capacity decreases with the increment of γ and increases with the increment of α and $$\tau_{1}$$ , while it is only slightly affected by the stiffened plate thickness. Compare the results of the finite element analysis with assessment by design guides existing. Based on the former results, an equation for estimating the load capacity of K-type tube-stiffened gusset plate is proposed.

Aluminum conductor composite core has many technical advantages such as high tensile strength, light weight, low sag, large current carrying capacity. In order to study the influence of the broken of aluminum conductor composite core on the transmission tower, tower-line model was built by using the finite element software ANSYS/LS-DYNA, and the deformation of joints and stress of bar were analyzed. The impact load and the impact coefficient of the representative bars of the transmission tower are calculated. The results show that the impact acting on the tower is the most serious in the place of the conductor suspension point, the connection of upper and lower crank arms, the tower neck.

Mechanical properties of reactive powder concrete (RPC) containing fly ash were investigated under different curing regimes (standard and steam curing) in this study. The experimental results indicate that, flexural strength of RPC increased considerably after steam curing, compared to the standard curing. Steam curing had no significant effect on compressive strength of RPC. Increasing the fly ash content improved the flexural strength of RPC under all curing regimes considerably. The compressive strength reached a maximum (103.8MPa) when the fly to ash and cement ratio is 0.3.

To explore the influence of axial compressive ratio on seismic behavior of reactive powder concrete(RPC) beam-column joints,this paper carry out RPC beam-column joints nonlinear finite element analysis,using software ABAQUS.The effect of different axial compression ratio on the ductility,energy dissipation capacity and bearing capacity are studied,based on hysteretic curves and skeleton curves of the components.The results show that,with the increase of axial compression ratio,skeleton curves of the components tend to be steep when the vertical load of beam ends exceed the peak point.The ultimate bearing capacity of the components are improved with the increasing of axial compression ratio which is less then 0.6,while the ultimate bearing capacity show a opposite trend when the axial compressive ratio exceed 0.6.

The author puts forward a new insulation cross arm, uses the insulation and high strength composite materials (FRP), to replace the steel applied to the RPC pole cross arm, this not only has a full bar maintenance-free features, and can shorten transmission corridor again, for the construction of resource intensive transmission lines has important practical significance. In addition, this paper uses finite element analysis software ANSYS, considering the influence of fluctuating wind, in the modal analysis and dynamic response illustrates the actuality of cross arm application of composite materials.

The beam-column joint is the key component of a RC structure and also the hub of stress transferring between beam and column. It is the major part for ensuring enough stiffness, ductility and good energy dissipation capacity of the RC frame. In order to simulate the beam-column joints under cyclic loading, a model based on OpeeSees was studied. OpenSees has advantages over other nonlinear analysis software in the improvement of algorithms. Comparison of simulated and observed hysteretic curve indicates that the proposed model is appropriate.

Given the path situation of Xiyue substation 220kV four outlets project crossing Shunde waterway section,this article applies of Dao Heng tower full stress analysis software and the finite element analysis software ANSYS to two steel pipe combination of angle steel towers to carry on design research,contrast axial stress of two kinds of software,analyse the reasons of axial stress difference.

Choosing LW15-550Y porcelain high voltage SF6 circuit breaker as the research subject, we designed the lead laminated rubber bearing (LRB) seismic isolation device for LW15-550Y circuit breaker. We finally gets the results that the LRB isolation system increases the flexibility of the breaker structure and improves the seismic performance of the high voltage circuit breaker structure.

tower consisted of steel tubes and angel steels has equal advantages which steel tube tower has and not easy to happen some bar breeze vibration,but but the wind vibration response for such transmission tower structure research is less. In the engineering background of a tower consisted of steel tubes and angel steels , set up the finite element model for transmission towers. Using Kaimal spectrum for numerical simulation of wind velocity time history. Of 90 ° Angle of wind direction wind to dynamic response are analyzed, the results show that for the displacement, the maximum of dynamic analysis results 88% larger than the result of the average wind, 53.7% larger than standard wind load static result; For axial force, the maximum of dynamic analysis results 147% larger than average the result of the wind, 108% larger than standard wind load static result. So in view of the transmission tower structure dynamic response analysis should be more precise.

In order to study the conduction performance of the old transmission lines, we carried out a comparative study by testing the heat dissipation of the old and the new overhead conductors (35 kV aluminium cable steel reinforced (ACSR) lines, LGJ70/10). The temperature variation of two distinct types of lines under the identical current flow was investigated in details theoretically and experimentally. Our extensive experiments show that the temperature rise of old lines is higher about 11% than those of new lines with the same current flow of 255 A. By combining the theoretical analysis and experimental observations, it is concluded that the heat radiated power of the old lines is higher about 46% than that of new lines, such high radiated heat power is the main factor affecting the temperature rise of old lines.

In order to study and solve the problem of connection on the part of the prestressed tendons RPC concrete pole engineering. Design connecting flange suitable for the existing part of the prestressed tendons RPC concrete pole developed by our group used the connection flange in Steel tower as the prototype.Through the ABAQUS software to establish the finite element model between the connection flange and part of the prestressed tendons RPC concrete pole, and carry out finite element analysis.Through the finite element analysis to get results whether the design of connecting flange can meet the strength requirements when the prestressed tendons RPC concrete pole is under ultimate load, so to get the practical design method of the 500kv part prestressed RPC concrete pole connecting flange.

Based on experiments of uniaxial compression and flexural experiments, the basic mechanical properties (compressive strength and flexural strength) of reactive powder concrete (RPC) were investigated, the effect of the steel fiber content on mechanical properties of RPC was studied in this work. The resu1ts indicate that the axial compressive strength of RPC had no obvious change with the change of steel fiber content. When the steel fiber content varied from 1.0% to 2.0%, the flexural strength of RPC had no obvious change.When the steel fiber content varied from 2.0% to 5.0%, the flexural strength of RPC increased dramaticlly with the increase of steel fibers content. According to experiment curves, an equation for the compressive stress-strain curve of RPC was deduced with different stee1 fiber content.

To study the mechanical properties of RPC performance and freeze-thaw resistance，through the experimental study discussed the water-cement ratio, silica fume cement ratio, steel fiber content, curing system and other factors on the mechanical properties of reactive powder concrete and anti-freezing properties. Research indicates that many factors in the RPC, the water cement ratio is the most important factor, followed by the silica fume cement ratio, finally the steel fiber content, and curing system for the growth of its early strength also have a greater role.

The original version of this article unfortunately contained a mistake. The corresponding author’s name “De-Hong Wang” was incorrectly spelled as “De-Dong Wang”.

A new kind of protective fitting which is safety pin is put into use in this paper, which can make transmission line dissociate from tower when ice thickness exceed the numerical value that ultimate load related. The approach has achieved the effect of avoiding and decreasing the ice disasters because it efficiently prevents collapse of power transmission tower and disconnection of transmission line. Through the analysis of ultimate load capacity of the 5A—ZM4 transmission tower in the «State Grid Typical Design Transmission and Distribution Projects « the load of controlling tower-line separation is determined. And then the size of safety pin is designed. The ultimate load capacity of safety pin analyzed by nonlinear finite element method through step loading is consistent with the load of controlling tower-line separation. As the loads increase, the safety pin status changes from elasticity to plasticity gradually, and finally the numerical non-convergence occurs. Based on this, the ultimate load capacity of safety pin and load-displacement curve gets. The safety pin meets the engineering requirements in normal use and disconnects necessarily through the analysis of the entire loading process. The order of formation of the microcosmic crack of safety pin and the macroscopic fracture judged through the crack formation criteria verifies the reliability of safety pin. The use of safety pin can achieve the objective of disasters prevention.

To the middling span cable-stayed bridge with single tower, it is very outstanding for material nonlinearity which caused by nonlinear properties of the material. So we must calculate the effects of the material nonlinearity which caused by nonlinear properties of the material when we calculate the geometry nonlinear effects to many middling span cable-stayed bridge with single tower. The other issue is that many people adopt simplified models in the course of the nonlinear static analysis to the bridge which can not get the particular law of the stress and the deformation of the bridge. Here, we take Jilin Linjiangmen cable-stayed bridge as an example, a new analysis model is established which adopts SOLID65 and LINK10 to simulate the concrete and the cables by ANSYS. The method breaks through the former form of the analysis model.

Bridge ambient vibration test has an advantage of being simple, fast and cheap. In this paper, we take the example of Linjiangmen Bridge which is located in Jilin City, Jilin province. The dynamic test research on the characteristics of the natural vibration for the bridge is discussed. The authors calculate the characteristics of the natural vibration for the bridge with the structure analysis software-ANSYS, and compare them with the test results. The finite element calculation results coincide with the dynamic test results, which demonstrated that the ambient vibration tests are sufficient to identify the most significant modes for this kind of cable-stayed bridges. The Identified dynamic properties can be served as the basis in the finite element model updating, damage detection, condition assessment and health monitoring of the bridge.

Ice storm is a kind of extreme weather conditions that can cause great losses to electric power system. The payments of power transmission towers account for 40 percent of total investment. For this, research on ultimate load and failure mechanism of transmission tower is very necessary. The property of ice coating is summarized in this paper. Also, the lateral load, the longitudinal load, and the vertical load of transmission tower under the effect of ice coating are discussed in detail. Taking a tangent tower as an example, finite element model is built with the consideration of beam element orientations. On these bases, the calculation of ultimate load capacity of the transmission tower is carried out in this paper. The results show that the mechanic behavior of transmission tower is similar to steel member, which can be approximately divided into three different stages: elastic stage, yield stage and strengthen stage.

The interplay of ferroelectrics and ferromagnetics gives an additional freedom for device design. Based on thermodynamic theory, the bending response of a bilayer terfenol-D/BaTiO3 system to external magnetic and electric fields was investigated. The vertical displacement induced by an asymmetry stress in the bilayer system can be controlled by the thicknesses of each layer, external electric field and magnetic field. A high relative static displacement of 55% can be obtained under a saturated magnetic field. The large bending response controlled by external electric and magnetic fields simultaneously may have potential applications for multifunctional devices.