建筑结构学报2026，Vol.47Issue(6)：87-96,10.DOI:10.14006/j.jzjgxb.2025.0634
配置Fe-SMA的钢筋混凝土梁火灾后受力性能试验研究
Experimental study on post-fire mechanical performance of concrete beams reinforced with Fe-SMA rebars
摘要
Abstract
Iron-based shape memory alloy(Fe-SMA)rebars embedded in reinforced concrete(RC)beams can be activated at fire exposure to create prestress and improve the post-fire mechanical performance.To study the mechanical properties of hybrid Fe-SMA/steel RC beams,post-fire bending tests were conducted on 16 full-scale specimens,including two ambient-temperature controls and 14 beams exposed to fire for 1.0 h or 1.5 h under load levels of 0.3 and 0.5.The effects of Fe-SMA replacement(0-3)and concrete cover thickness(25 mm and 35 mm)were investigated.The results show that,under sustained loading,increasing cover thickness alone does not significantly reduce the rebar temperature due to fire-induced cracking.Replacing part of the tensile reinforcements with 6%prestrained Fe-SMA rebars reduces the section heating rate during 60-90 min of fire exposure.Fe-SMA reinforcement increases the residual load capacity by up to 17.9%compared with conventional RC beams.With two Fe-SMA rebars,the residual capacity after 1 h fire exposure at a load level of 0.3 is slightly higher than that of the ambient control.Partial recovery of initial stiffness is observed at the 0.3 load level,whereas stiffness improvement becomes limited at the 0.5 load level and 1.5 h fire exposure due to the weakened recovery stress effect.关键词
混凝土梁/Fe-SMA/受火试验/静力试验/回复应力/形状记忆效应/火灾后受力性能Key words
concrete beam/Fe-SMA/fire test/static test/recovery stress/shape memory effect/post-fire mechanical properties分类
建筑与水利引用本文复制引用
郑逸川,董志强,朱虹,崔础石..配置Fe-SMA的钢筋混凝土梁火灾后受力性能试验研究[J].建筑结构学报,2026,47(6):87-96,10.基金项目
国家重点研发计划(2024YFD1600404),江苏省优秀青年基金项目(BK20230088),国家自然科学基金面上项目(52378139),东南大学至善青年学者项目(2242025RCB0007). （2024YFD1600404）
