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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Main Authors: Yan Kai, Zhang Yao, Cai Hao, Fan Lili, Xin Zhang
Format: Article
Language:English
Published: Hindawi Limited 2020-01-01
Series:Advances in Materials Science and Engineering
Online Access:http://dx.doi.org/10.1155/2020/7837418
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spelling 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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