Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.028
O. Savchenko, Yuriy Yurkevych, O. Voznyak, Zenon Savchenko
The analytic research was conducted for a residential building built according to a typical project in Lviv. As the research data showed, the requirements of the existing normative documents of Ukraine do not allow to significantly reduce the heat load on the heat source. Thus, the value of the maximum heat flow to the heating system decreased by 36%, and the maximum heat flow to the hot water supply system - by 7.7%, and the total maximum hourly heat consumption, respectively, decreased by 23%. In addition, studies have established that for such values of the thermal power of the heat source, a decrease in the temperature parameters of the heat carrier can lead to an increase in the consumption of the heat carrier to provide thermal energy to the house by almost 3 times. And this, in turn, for the same diameter of the pipeline, leads to an increase in specific pressure losses by more than 5 times, and, accordingly, to an increase in the power of circulation pumps, the consumption of electrical energy and the cost of these pumps. This means that at present, the transition of large systems of district heating system of Ukraine to low-temperature coolants is possible only during the reconstruction of heat networks.
{"title":"Assessment of the possibility of transferring Ukrainian district heating systems to low-temperature coolants","authors":"O. Savchenko, Yuriy Yurkevych, O. Voznyak, Zenon Savchenko","doi":"10.23939/jtbp2023.01.028","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.028","url":null,"abstract":"The analytic research was conducted for a residential building built according to a typical project in Lviv. As the research data showed, the requirements of the existing normative documents of Ukraine do not allow to significantly reduce the heat load on the heat source. Thus, the value of the maximum heat flow to the heating system decreased by 36%, and the maximum heat flow to the hot water supply system - by 7.7%, and the total maximum hourly heat consumption, respectively, decreased by 23%. In addition, studies have established that for such values of the thermal power of the heat source, a decrease in the temperature parameters of the heat carrier can lead to an increase in the consumption of the heat carrier to provide thermal energy to the house by almost 3 times. And this, in turn, for the same diameter of the pipeline, leads to an increase in specific pressure losses by more than 5 times, and, accordingly, to an increase in the power of circulation pumps, the consumption of electrical energy and the cost of these pumps. This means that at present, the transition of large systems of district heating system of Ukraine to low-temperature coolants is possible only during the reconstruction of heat networks.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115869685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.049
Iurii Sidun, K. Sobol, Volodymyr Bidos, Oleksii Hunyak, I. Protsyk
This article describes the classification of cationic bitumen emulsions according to "reactivity" and breaking behaviour characteristics. The methods of researching the characteristics of breaking behaviour for bitumen emulsions of different "reactivity" in accordance with European and Ukrainian regulatory documents are presented. Available possible emulsifiers in Ukraine for over-stabilised bitumen emulsions are given with a description of road technology where they can be applied. The experience of using over-stabilised bitumen cationic emulsions in road construction is characterized. Namely, a literature review of the use of over-stabilised bitumen cationic emulsions in soil stabilization technologies, strengthening of base course materials with emulsion, and "cold recycling" technology was carried out. The regularities of the interaction of over-stabilised bitumen emulsion with finely dispersed mineral binders and fillers are reviewed.
{"title":"Cationic over-stabilised bitumen emulsion in road construction - review","authors":"Iurii Sidun, K. Sobol, Volodymyr Bidos, Oleksii Hunyak, I. Protsyk","doi":"10.23939/jtbp2023.01.049","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.049","url":null,"abstract":"This article describes the classification of cationic bitumen emulsions according to \"reactivity\" and breaking behaviour characteristics. The methods of researching the characteristics of breaking behaviour for bitumen emulsions of different \"reactivity\" in accordance with European and Ukrainian regulatory documents are presented. Available possible emulsifiers in Ukraine for over-stabilised bitumen emulsions are given with a description of road technology where they can be applied. The experience of using over-stabilised bitumen cationic emulsions in road construction is characterized. Namely, a literature review of the use of over-stabilised bitumen cationic emulsions in soil stabilization technologies, strengthening of base course materials with emulsion, and \"cold recycling\" technology was carried out. The regularities of the interaction of over-stabilised bitumen emulsion with finely dispersed mineral binders and fillers are reviewed.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132985656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.037
M. Sanytsky, Тetiana Kropyvnytska, Orest Shyiko, Yurii Bobetskyi, Andriy Volianiuk
The article presents the results of research on modified steel fiber-reinforced concrete and shows the expediency of their use to increase the effectiveness of fortification protection structures against shock loads. It was established that according to the results of tests of compressive strength (fсm = 79.4 MPa) and tensile strength during bending (fс, lf = 7.4 MPa), steel fiber-reinforced concrete can be classified as high-strength (strength class C 50/60) and rapid-hardening (fcm2/ fcm28 = 0.57) in accordance with DSTU EN 206:2018. Manufacturing in factory conditions of reinforced concrete elements of structures based on high-strength steel fiber-reinforced concrete with increased resistance to various types of force effects during shelling will allow to obtain quick-assembling/quick-dismantling fortification structures that will be able to provide protection for the personnel of the units of the armed forces of Ukraine.
{"title":"High strength steel fiber reinforced concrete for fortification protected structures","authors":"M. Sanytsky, Тetiana Kropyvnytska, Orest Shyiko, Yurii Bobetskyi, Andriy Volianiuk","doi":"10.23939/jtbp2023.01.037","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.037","url":null,"abstract":"The article presents the results of research on modified steel fiber-reinforced concrete and shows the expediency of their use to increase the effectiveness of fortification protection structures against shock loads. It was established that according to the results of tests of compressive strength (fсm = 79.4 MPa) and tensile strength during bending (fс, lf = 7.4 MPa), steel fiber-reinforced concrete can be classified as high-strength (strength class C 50/60) and rapid-hardening (fcm2/ fcm28 = 0.57) in accordance with DSTU EN 206:2018. Manufacturing in factory conditions of reinforced concrete elements of structures based on high-strength steel fiber-reinforced concrete with increased resistance to various types of force effects during shelling will allow to obtain quick-assembling/quick-dismantling fortification structures that will be able to provide protection for the personnel of the units of the armed forces of Ukraine.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125318514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.015
Ihor Mudryy
Construction in an existing building usually increases the time required to organize and perform process operations. The paper analyzes the existing methods for evaluating compressibility for various regulatory documents and their relationship with the conditions of the construction site and surrounding buildings, shows the need to systematize approaches to compressibility evaluation and develop appropriate design recommendations. Based on theoretical research, the author concludes that there is a need to formulate the terms "compact construction conditions" or "conditions of dense housing"; to compile a list of compressibility conditions and their classification, grouping in order to identify the impact of each group on the cost and duration of construction and installation works; to develop a general procedure for assessing the compressibility of work conditions (indicator) and the necessary measures depending on its quantitative value.
{"title":"Evaluation of compressibility indicators for housing density","authors":"Ihor Mudryy","doi":"10.23939/jtbp2023.01.015","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.015","url":null,"abstract":"Construction in an existing building usually increases the time required to organize and perform process operations. The paper analyzes the existing methods for evaluating compressibility for various regulatory documents and their relationship with the conditions of the construction site and surrounding buildings, shows the need to systematize approaches to compressibility evaluation and develop appropriate design recommendations. Based on theoretical research, the author concludes that there is a need to formulate the terms \"compact construction conditions\" or \"conditions of dense housing\"; to compile a list of compressibility conditions and their classification, grouping in order to identify the impact of each group on the cost and duration of construction and installation works; to develop a general procedure for assessing the compressibility of work conditions (indicator) and the necessary measures depending on its quantitative value.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123244938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.021
M. Hohol, Dmytro Sydorak, Marko Hohol
In this article, a new method of increasing the efficiency of combined steel roof trusses is proposed and considered. A rational shape of the steel roof truss, including its topology and rational geometric parameters, was obtained, but without obtaining a rational SSS. A proposed method provides the adjustment of SSS in the truss by changing the upper belt panel length. On the basis of the obtained rational SSS of the combined truss, a new structural form is proposed. It is shown that thanks to the proposed method, it is possible to obtain a more efficient design by 18-32%, compared to typical ones. The diagram of the moments in the stiffness beam of the reference truss and the truss with SSS regulation is given. Further directions of research are determined, in particular, the development or improvement of rational structural forms and the use of calculation method of regulation of SSS in the stiffness beam of the steel combined truss.
{"title":"New design form of steel combined roof trusses","authors":"M. Hohol, Dmytro Sydorak, Marko Hohol","doi":"10.23939/jtbp2023.01.021","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.021","url":null,"abstract":"In this article, a new method of increasing the efficiency of combined steel roof trusses is proposed and considered. A rational shape of the steel roof truss, including its topology and rational geometric parameters, was obtained, but without obtaining a rational SSS. A proposed method provides the adjustment of SSS in the truss by changing the upper belt panel length. On the basis of the obtained rational SSS of the combined truss, a new structural form is proposed. It is shown that thanks to the proposed method, it is possible to obtain a more efficient design by 18-32%, compared to typical ones. The diagram of the moments in the stiffness beam of the reference truss and the truss with SSS regulation is given. Further directions of research are determined, in particular, the development or improvement of rational structural forms and the use of calculation method of regulation of SSS in the stiffness beam of the steel combined truss.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121641258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.072
V. Zhuk, Taras Bodnar
Hidden leaks from water supply networks account for 50% to 90% of total leakage losses. The presence of two or more simultaneous leaks in a section of the water supply network significantly reduces the accuracy of locating hidden leaks. The method of independent Poisson events and the hypothesis of stationarity, absence of consequences, and ordinariness of leaks are used for the probabilistic description of the problem of multi-leakage in water supply networks. The analytical dependence of the probability of multiple leakages on the specific annual emergency rate of the site, its length and the duration of the localization and repair period is obtained. A generalized semi-empirical equation was obtained for estimating the maximum permissible duration of the localization and repair period depending on the annual emergency rate of the site for a given multi-leakage probability.
{"title":"Probability of simultaneous multiple leakages at sections of water networks in the process of localization of hidden water leaks","authors":"V. Zhuk, Taras Bodnar","doi":"10.23939/jtbp2023.01.072","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.072","url":null,"abstract":"Hidden leaks from water supply networks account for 50% to 90% of total leakage losses. The presence of two or more simultaneous leaks in a section of the water supply network significantly reduces the accuracy of locating hidden leaks. The method of independent Poisson events and the hypothesis of stationarity, absence of consequences, and ordinariness of leaks are used for the probabilistic description of the problem of multi-leakage in water supply networks. The analytical dependence of the probability of multiple leakages on the specific annual emergency rate of the site, its length and the duration of the localization and repair period is obtained. A generalized semi-empirical equation was obtained for estimating the maximum permissible duration of the localization and repair period depending on the annual emergency rate of the site for a given multi-leakage probability.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121297740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.102
Gavin Gengan, H. Kew, Poutos Konstantinos
The exponential expansion in concrete use has put the environment under immense pressure to supply cement, aggregates, and water. Natural resource consumption impacts the environment and undermines the concrete industry. A swift shift towards sustainable concrete is required considering the emergency triggered by human activity on the climate. Glass concrete (GC) has sparked the curiosity of the construction industry owing to its environmentally friendly approach. The study uses recycled glass aggregates (RGA) to partially replace natural aggregates (NA) to produce sustainable structural concrete with superior mechanical properties. 20% glass concrete outperformed all others in fresh and hardened concrete. Only 75% glass blend demonstrated a slight decrease in compressive strength due to drop in density. Glass concrete showed a lower water absorption capacity. However, glass has triggered an alkali-silica (ASR) reaction, reducing the durability of the concrete significantly.
{"title":"Effect of recycled of recycled glass aggregates on mechanical and physical properties of structural concrete","authors":"Gavin Gengan, H. Kew, Poutos Konstantinos","doi":"10.23939/jtbp2023.01.102","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.102","url":null,"abstract":"The exponential expansion in concrete use has put the environment under immense pressure to supply cement, aggregates, and water. Natural resource consumption impacts the environment and undermines the concrete industry. A swift shift towards sustainable concrete is required considering the emergency triggered by human activity on the climate. Glass concrete (GC) has sparked the curiosity of the construction industry owing to its environmentally friendly approach. The study uses recycled glass aggregates (RGA) to partially replace natural aggregates (NA) to produce sustainable structural concrete with superior mechanical properties. 20% glass concrete outperformed all others in fresh and hardened concrete. Only 75% glass blend demonstrated a slight decrease in compressive strength due to drop in density. Glass concrete showed a lower water absorption capacity. However, glass has triggered an alkali-silica (ASR) reaction, reducing the durability of the concrete significantly.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132407006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.23939/jtbp2023.01.043
I. Kirakevych, M. Sanytsky, Danylo Kotur
The article examines the effect of thermal insulation from autoclaved aerated concrete on the energy characteristics of a single-family house. Analysis of mathematical models of energy characteristics of external enclosing structures of buildings depending on the thickness of AEROC autoclaved concrete products according to the criteria of heat loss shows that the thermal resistance value of 7.11 m2K/W and the heat transfer coefficient of 0.141 W/(m2K) are achieved using the wall block AEROC D 300 and AEROC Energy thermal insulation panel with a thickness of 200 mm. These indicators correspond to the passive house standard for thermal resistance (Ro ≥ 6.7 m2K/W) and heat transfer coefficient (Uo ≤ 0.15 W/m2K) of external walls, which confirms the feasibility of using AEROC Energy D 150 thermal insulation panels in combination with wall blocks AEROC D 300 for housing construction according to passive construction standards.
本文考察了保温效果从蒸压加气混凝土对单户住宅的能源特性。根据热损失准则对AEROC蒸压混凝土产品厚度对建筑围护结构能量特性影响的数学模型进行分析，结果表明，采用AEROC D 300墙体砌块和厚度为200 mm的AEROC能量保温板，其热阻值为7.11 m2K/W，换热系数为0.141 W/(m2K)。这些指标符合被动式房屋外墙热阻(Ro≥6.7 m2K/W)和传热系数(Uo≤0.15 W/m2K)标准，证实了按照被动式建筑标准，采用AEROC Energy D 150绝热板结合墙块AEROC D 300进行房屋施工的可行性。
{"title":"The effect of thermal insulation from autoclaved aerated concrete on the energy performance of a single-family house","authors":"I. Kirakevych, M. Sanytsky, Danylo Kotur","doi":"10.23939/jtbp2023.01.043","DOIUrl":"https://doi.org/10.23939/jtbp2023.01.043","url":null,"abstract":"The article examines the effect of thermal insulation from autoclaved aerated concrete on the energy characteristics of a single-family house. Analysis of mathematical models of energy characteristics of external enclosing structures of buildings depending on the thickness of AEROC autoclaved concrete products according to the criteria of heat loss shows that the thermal resistance value of 7.11 m2K/W and the heat transfer coefficient of 0.141 W/(m2K) are achieved using the wall block AEROC D 300 and AEROC Energy thermal insulation panel with a thickness of 200 mm. These indicators correspond to the passive house standard for thermal resistance (Ro ≥ 6.7 m2K/W) and heat transfer coefficient (Uo ≤ 0.15 W/m2K) of external walls, which confirms the feasibility of using AEROC Energy D 150 thermal insulation panels in combination with wall blocks AEROC D 300 for housing construction according to passive construction standards.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126592685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-20DOI: 10.23939/jtbp2022.02.105
T. Markiv
The influence of the air-entraining agent (AEA) on a density, the volume of entrained air of mortar mix and compressive strength of hardened mortar was studied in this article. Results show that the addition of AEA results in the reduction of water to cement ratio to provide the targeted flow and the density that depends on the volume of entrained air. The addition of AEA causes the decrease of the density of mortar (C:S=1:2) by 8,2% and the increase of the compressive strength by 13,9% after 28 days of hardening compared to the mortar (C:S=1:2) without AEA. The further increase of a sand content in a mortar (C:S=1:3) results in slight decrease of a density of fresh mortar and compressive strength. If C:S ratio is 1:4 the increase of the density and the compressive strength decrease is observed in comparison with the mortar with C:S=1:3. The obtained results show that properties of mortar incorporating AEA depend on its mix proportion.
{"title":"PROPERTIES OF FRESH AND HARDENED MORTARS WITH AIR-ENTRAINING AGENT","authors":"T. Markiv","doi":"10.23939/jtbp2022.02.105","DOIUrl":"https://doi.org/10.23939/jtbp2022.02.105","url":null,"abstract":"The influence of the air-entraining agent (AEA) on a density, the volume of entrained air of mortar mix and compressive strength of hardened mortar was studied in this article. Results show that the addition of AEA results in the reduction of water to cement ratio to provide the targeted flow and the density that depends on the volume of entrained air. The addition of AEA causes the decrease of the density of mortar (C:S=1:2) by 8,2% and the increase of the compressive strength by 13,9% after 28 days of hardening compared to the mortar (C:S=1:2) without AEA. The further increase of a sand content in a mortar (C:S=1:3) results in slight decrease of a density of fresh mortar and compressive strength. If C:S ratio is 1:4 the increase of the density and the compressive strength decrease is observed in comparison with the mortar with C:S=1:3. The obtained results show that properties of mortar incorporating AEA depend on its mix proportion.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124133401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-20DOI: 10.23939/jtbp2022.02.025
H. Hladyshev, D. Hladyshev, Ihor Butrynskyi
The research and analysis of technical conditions, deflections, and bearing capacity of subjected to fire impact reinforced concrete slabs of raised “panel per room” typical design model 1-480a of a five-storey residential building in Lviv are present. A study of the technical condition of floor structures in the area of high temperatures. In the area of intense fire a decrease in the bearing capacity and rigidity of the shelf of the tent floor slab under the action of high temperatures was found. Due to the fire impact, the thin plate of raised panel slabs completely loses load-bearing capacity, with large sagging deflections, caused by the plastic elongation of the wire reinforcement due to the action of high temperature. The developed design of the reinforcement of the riced plate slab is considered.
{"title":"EVALUATION OF FIRE IMPACTED RAISED SLABS OF RESIDENTIAL BUILDING IN LVIV AND THEIR REINFORCEMENT","authors":"H. Hladyshev, D. Hladyshev, Ihor Butrynskyi","doi":"10.23939/jtbp2022.02.025","DOIUrl":"https://doi.org/10.23939/jtbp2022.02.025","url":null,"abstract":"The research and analysis of technical conditions, deflections, and bearing capacity of subjected to fire impact reinforced concrete slabs of raised “panel per room” typical design model 1-480a of a five-storey residential building in Lviv are present. A study of the technical condition of floor structures in the area of high temperatures. In the area of intense fire a decrease in the bearing capacity and rigidity of the shelf of the tent floor slab under the action of high temperatures was found. Due to the fire impact, the thin plate of raised panel slabs completely loses load-bearing capacity, with large sagging deflections, caused by the plastic elongation of the wire reinforcement due to the action of high temperature. The developed design of the reinforcement of the riced plate slab is considered.","PeriodicalId":369033,"journal":{"name":"Theory and Building Practice","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117072965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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