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6 results on '"Eva Šuhajdová"'

1. Experimental Research on Hybrid Hardwood Glue-Laminated Beams

Author

Eva Šuhajdová, Pavel Schmid, Miloslav Novotný, Jan Pěnčík, Karel Šuhajda, and Ondřej Uhlík

Subjects
beech wood, bending strength, hybrid hardwood glue-laminated beam, modulus of elasticity, poplar wood, Building construction, TH1-9745
Abstract

The aim of this work was to verify the behavior of hybrid hardwood glue-laminated beams and the possibility of replacing Norway spruce (Picea abies) construction elements, especially in roof and ceiling structures. The samples were six lamellae homogeneous beech (Fagus sylvatica) beams and six-lamellae hybrid beech-poplar (Fagus sylvatica–Poplar spp.) beams; each beam had a cross-section of 60 × 120 mm and was glued with polyurethane adhesive. The samples were loaded using destructive four-point bending tests according to EN 408; the obtained bending strength and modulus of elasticity were statistically evaluated and compared to each other in both types of samples. The results showed that the examined properties of the hybrid beams (with a 16% weight reduction) are comparable to the properties of homogeneous beech glue-laminated beams. Based on the obtained data, the timber elements that are currently used can be successfully replaced by hardwood glue-laminated elements. Based on their higher load-bearing capacity, the cross-section depth can be reduced compared to a larger cross-section depth in spruce beams; this means that hardwood could be suitable in building renovations.

Published
2023
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2. Heat Flow through a Facede with a Controlled Ventilated Gap

Author

Aleš Rubina, Pavel Uher, Jakub Vrána, Miloslav Novotný, Ondřej Nespěšný, Daniel Skřek, Eva Šuhajdová, Jan Vystrčil, and Marian Formánek

Subjects
ventilated façades, air flow, heat balance, FSVM software, Building construction, TH1-9745
Abstract

The article presents current research results in the field of airflow through a façade with a width of 1 m and a height of 13.7 m and with a ventilated gap, and its effect on the year-round heat balance of this façade. An idea to influence airflow in the ventilated gap of the façade is presented based on the results of developed software and the suitability of closing the air gap in winter and in the transition period of the year is described. First, the boundary conditions of the calculations, which are further used in the energy balance between the interior of the building and the exterior environment are defined. In order to include these influences, a discrete analytical calculation was created. It consists of the time distribution of the investigated thermal phenomena calculations. A significant finding is an obvious benefit of controlling the airflow through a ventilated gap in the winter and especially in the transitional period of the year. This technological knowledge has a high potential for energy savings related to the heating of buildings. As the calculations show, airflow control through a ventilated façade reduces heat flow by 25–30% on average, and in contrast, it increases heat gains by 20% and the specific values are presented within the article.

Published
2023
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3. Experimental research on load bearing capacity of adhesively jointed beech timber lamellas

Author

Eva Šuhajdová, Miloslav Novotný, Jan Pěnčík, and Karel Šuhajda

Subjects
021105 building & construction, 0211 other engineering and technologies, 02 engineering and technology, 021001 nanoscience & nanotechnology, 0210 nano-technology
Abstract

The aim of this work was to verify behavior of a beech timber finger-joint in local conditions in the Central Europe. The samples were produced with a glued joint with the finger length of 23 mm according to standard ČSN EN 14 080. Commonly used polyurethane adhesive for production of engineered wood products in the Czech Republic was used. The samples were loaded by destructive four-point bending tests according to standard ČSN EN 408, and the achieved bending strength was statistically evaluated and compared with results of non-glued samples. The results showed that bending strength of lamellas with a finger-joint reached about 65% of the strength of samples without a joint, and the failure of lamellas occurred in most cases at the joint.

Published
2019

4. Evaluation of suitability of selected hardwood in civil engineering

Author

Miloslav Novotný, Bohumil Straka, Karel Šuhajda, Pavel Schmid, Jan Pěnčík, and Eva Šuhajdová

Subjects
0209 industrial biotechnology, 020901 industrial engineering & automation, Computer science, 0202 electrical engineering, electronic engineering, information engineering, Hardwood, 020201 artificial intelligence & image processing, 02 engineering and technology, Civil engineering
Published
2018

5. Selection of heating system based on acquisition and operating cost for family house

Author

Eva Šuhajdová, Radim Kucera, Karel Šuhajda, and Miloslav Novotný

Subjects
Rate of return, return rate, 0209 industrial biotechnology, Engineering, Life span, business.industry, 020209 energy, Promethee, heating, 02 engineering and technology, Automotive engineering, law.invention, Boiler (water heating), heat loss, 020901 industrial engineering & automation, Heating system, law, multi-criteria analysis, Single-family detached home, 0202 electrical engineering, electronic engineering, information engineering, Electric heating, business, Simulation, Heat pump, price for energy
Abstract

The aim of this study is to evaluate mutual dependences and significance of the input factors of a heating system for a family house. The input factors which are being most commonly considered are operating costs, acquisition prices on financial return rate, life span of these systems or requirements for maintenance and control. This research is focused on the analysis of three different heating systems in the common detached house; electric heating foils, heat pump and gas boiler. The building itself is evaluated in three variants; with and without a ventilation unit and with adjusted structure composition. To analyse the parameters mentioned above the Promethee method (multicriterial analysis) has been used. DOI: https://doi.org/10.3846/bm.2016.50

Published
2016

6. Management System Of Building Production Process In Central Europe

Author

Michal Potuznik, Miroslav Matl, Miloslav Novotny, Eva Šuhajdová, Karel Šuhajda, František Vajkay, and Jan Skramlik

Subjects
Risk analysis (engineering), Work (electrical), Project commissioning, Process (engineering), media_common.quotation_subject, Management system, Production (economics), Quality (business), Business, Rescission, Investment (macroeconomics), media_common
Abstract

Management system and its components, the management system of quality inspection, management system of safety and health protection at work and management system of environmental protection are widely used within the building industry. Hence, processes like preparation, compliance and evaluation of the management system are clearly definable and they guarantee that the construction was built not only within the boundaries of the latest acts, decrees, and other important regulations, but also that the construction was constructed inside the framework of pre-defined elements of the management system. In terms of the actual building production process it is possible to define the parts of the management system with regards to its individual phases. These phases include the management system of investment preparation as part of the investment decision-making process, the management system of the preand in-design phase, management system of contractor selection, management system of building production process, management system for commissioning of the construction and the management system of utilization (including inand postterm warranties and customer care). In engineering practice, first of all a great emphasis is put onto the management systems of building production, which is often prepared improperly and insufficiently or is just partially neglected by the contractor. Basically, failures within the implementation of the elements of the management system do often lead to a breach of contracted terms, degradation of quality of building realisation and may ultimately lead to the rescission of contract between the client and the contractor.

Published
2014

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