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原文传递 Fire-Resistance Mechanism and Residual Bearing Capacity of Prestressed Concrete Beams after Fire Exposure

题名：	Fire-Resistance Mechanism and Residual Bearing Capacity of Prestressed Concrete Beams after Fire Exposure
正文语种：	eng
作者：	Yu, Ying;Hang, Zhenyuan;Zhao, Wei;Zhao, Xiaohua
作者单位：	Shantou Univ Dept Civil Engn Shantou 515063 Peoples R China\|Shantou Univ Guangdong Engn Ctr Struct Safety & Hlth Monitorin Shantou 515063 Peoples R China;Shantou Univ Dept Civil Engn Shantou 515063 Peoples R China\|Zhejiang Inst Commun Coll Rd & Bridge Hangzhou 311112 Peoples R China;Zhejiang Inst Commun Coll Rd & Bridge Hangzhou 311112 Peoples R China;Shantou Univ Dept Civil Engn Shantou 515063 Peoples R China\|Shantou Univ Guangdong Engn Ctr Struct Safety & Hlth Monitorin Shantou 515063 Peoples R China
关键词：	Fire-resistance;Prestressed concrete;Residual stiffness;Residual bending capacity;Catenary action
摘要：	The fire resistance and residual bearing capacity of prestressed concrete (PC) beams after fire exposure are very important to the safety of engineering applications. This study performed experimental investigations and theoretical calculations of the fire resistance of PC T-beams subjected to a standard fire. Effects of fire exposure time, steel strand location, and prestress level on failure mode, ductility, residual bending capacity, and residual stiffness of PC T-beams were investigated. The bending working mechanism of PC T-beams after exposure to the standard fire was determined. With increased fire exposure time, the ductility and bending stiffness decreased significantly and the failure mode changed. However, because of catenary action, extra vertical force between the end support of specimens and steel strands increased the ultimate bending capacity of fire-damaged PC T-beams. Multilayer steel strands with high prestress could delay initial crack occurrence and increase residual bending capacity effectively. However, they have little influence on residual stiffness. (C) 2021 American Society of Civil Engineers.
出版年：	2021
期刊名称：	Journal of structural engineering
卷：	147
期：	8