Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures
Since the postfire safety of prestressed RPC beams after exposure to elevated temperatures needs to be studied and proved, this paper prepares eight smart prestressed RPC beams with intelligent sensors built in to monitor the internal temperature, force, and strain. The residual bearing tests after...
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2020-01-01
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Series: | Advances in Materials Science and Engineering |
Online Access: | http://dx.doi.org/10.1155/2020/7837418 |
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doaj-3bb959181e0448adaf18599f79cba94f2020-11-25T03:27:12ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/78374187837418Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated TemperaturesYan Kai0Zhang Yao1Cai Hao2Fan Lili3Xin Zhang4Key Lab of Building Structural Retrofitting and Underground Space Engineering of the Ministry of Education, Shandong Jianzhu University, Jinan, ChinaKey Lab of Building Structural Retrofitting and Underground Space Engineering of the Ministry of Education, Shandong Jianzhu University, Jinan, ChinaKey Lab of Building Structural Retrofitting and Underground Space Engineering of the Ministry of Education, Shandong Jianzhu University, Jinan, ChinaShandong Institute of Mechanical Design, Jinan, ChinaKey Lab of Building Structural Retrofitting and Underground Space Engineering of the Ministry of Education, Shandong Jianzhu University, Jinan, ChinaSince the postfire safety of prestressed RPC beams after exposure to elevated temperatures needs to be studied and proved, this paper prepares eight smart prestressed RPC beams with intelligent sensors built in to monitor the internal temperature, force, and strain. The residual bearing tests after fire are carried out. The failure process of the beams under static load with different fire durations cover thickness of tendons, load ratio, bonded and unbonded tendons, and partial prestressing ratio, which are investigated. The load-deflection curves, crack distributions and developments, and strain variations are obtained, in addition to the damage mechanism and failure mode of the beams. The results show that the load-deflection curve of the prestressed RPC beam after fire has obviously three polylines, and the deflection points are where the cracks expand and the tendons yield. The failure procedure is the same as that of under-reinforced beams, while the height of the crushing zone is much lower than that of the balanced-reinforced beam at room temperature. The whole span deformation demonstrates a strong catenary effect, and the midspan deflection is approximately 1/40 of the effective span. The postfire safety of the bonded prestressed RPC beams is superior to that of unbonded prestressed RPC beams. The test results of this paper provide a basis for the safety performance evaluation and control of prestressed RPC beams after fire.http://dx.doi.org/10.1155/2020/7837418 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yan Kai Zhang Yao Cai Hao Fan Lili Xin Zhang |
spellingShingle |
Yan Kai Zhang Yao Cai Hao Fan Lili Xin Zhang Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures Advances in Materials Science and Engineering |
author_facet |
Yan Kai Zhang Yao Cai Hao Fan Lili Xin Zhang |
author_sort |
Yan Kai |
title |
Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures |
title_short |
Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures |
title_full |
Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures |
title_fullStr |
Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures |
title_full_unstemmed |
Postfire Safety Investigation on Prestressed RPC Beams after Exposure to Elevated Temperatures |
title_sort |
postfire safety investigation on prestressed rpc beams after exposure to elevated temperatures |
publisher |
Hindawi Limited |
series |
Advances in Materials Science and Engineering |
issn |
1687-8434 1687-8442 |
publishDate |
2020-01-01 |
description |
Since the postfire safety of prestressed RPC beams after exposure to elevated temperatures needs to be studied and proved, this paper prepares eight smart prestressed RPC beams with intelligent sensors built in to monitor the internal temperature, force, and strain. The residual bearing tests after fire are carried out. The failure process of the beams under static load with different fire durations cover thickness of tendons, load ratio, bonded and unbonded tendons, and partial prestressing ratio, which are investigated. The load-deflection curves, crack distributions and developments, and strain variations are obtained, in addition to the damage mechanism and failure mode of the beams. The results show that the load-deflection curve of the prestressed RPC beam after fire has obviously three polylines, and the deflection points are where the cracks expand and the tendons yield. The failure procedure is the same as that of under-reinforced beams, while the height of the crushing zone is much lower than that of the balanced-reinforced beam at room temperature. The whole span deformation demonstrates a strong catenary effect, and the midspan deflection is approximately 1/40 of the effective span. The postfire safety of the bonded prestressed RPC beams is superior to that of unbonded prestressed RPC beams. The test results of this paper provide a basis for the safety performance evaluation and control of prestressed RPC beams after fire. |
url |
http://dx.doi.org/10.1155/2020/7837418 |
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