火灾后SRC柱-RC梁框架结构性能反复加载试验研究  

Cyclic loading test on the performance of SRC column-RC beam frame after exposure to fire

作　　者：李俊华 李权平[2] 张磊 黄梦迪[2] LI Junhua;LI Quanping;ZHANG Lei;HUANG Mengdi(School of Civil Engineering,Quanzhou University of Information Engineering,Quanzhou 362000,Fujian,P.R.China;School of Civil and Environment Engineering,Ningbo University,Ningbo 315211,Zhejiang,P.R.China)

机构地区：[1]泉州信息工程学院土木工程学院,福建泉州362000 [2]宁波大学土木与环境工程学院,浙江宁波315211

出　　处：《土木与环境工程学报（中英文）》2021年第1期107-119,共13页Journal of Civil and Environmental Engineering

基　　金：National Natural Science Foundation of China(No.51178226);Basic Public Welfare Research Project of Zhejiang Province(No.LGF18E080008)。

摘　　要：对一个SRC柱-RC梁框架在火灾后与另一个对照框架在常温下进行了低周反复加载试验,研究了该框架的火灾后性能,评价了框架的承载力、刚度退化、延性、耗能能力、累积损伤,同时对P-Δ效应进行了分析。试验结果表明,与未暴露在火灾的SRC柱-RC梁框架相比,火灾后SRC柱-RC梁框架的承载力降低、刚度减小、延性系数下降、累积损伤增大,且P-Δ效应更为明显。由于框架柱截面中有核心钢的存在,SRC柱-RC梁框架在火灾后的滞回曲线仍保持饱满,破坏前的承载力可以保持在较高的水平,依然表现出良好的耗能能力。其塑性极限转动超过0.04rad,可以满足中国抗震设计规范的要求。Quasi-static cyclic tests were performed on one SRC column-RC beam frame after exposure to fire and an identical frame at ambient temperature to investigate the post-fire performance of the frame.The load bearing capacity,stiffness degeneration,ductility,and energy dissipation were evaluated,and the cumulative damage and the P-Δeffect were analyzed.Test results showed that after exposure to fire the SRC column-RC beam frame had a lower bearing capacity,less stiffness,lower ductility,increased cumulative damage and a more obvious P-Δeffect compared with its unexposed counterpart.Owing to the existence of core steel in the section of the frame column,after exposure to fire,the hysteresis loops of the SRC column-RC beam frame remained plump,and the load bearing capacity remained relatively high before destruction.Moreover,after exposure to fire,the SRC column-RC beam frame exhibited good energy consumption ability.The plastic limit rotation exceeded 0.04 rad,which could well meet the requirement of China’s seismic design code.

关 键 词：型钢混凝土 框架 火灾 反复荷载 抗震性能 

分 类 号：TU391[建筑科学—结构工程] TU398