建筑结构学报2018，Vol.39Issue(3)：84-92,9.DOI:10.14006/j.jzjgxb.2018.03.011
锈蚀钢筋混凝土框架节点高温后抗震性能试验研究
Experimental study on seismic performance of corroded RC frame joints after fire
摘要
Abstract
Four RC frame beam-column joints were designed to study the effects of reinforcement corrosion on bearing capacity and seismic behavior of RC frame joints after fire.Four joints were designed to make the steel rebar suffer from different degrees of corrosion by electrochemistry accelerated corrosion test.The one-hour fire test and low cyclic loading test were carried out orderly on the four joints to get the distribution rule of temperature field along each cross-section and then study the effects of reinforcement corrosion rate on bearing capacity,ductility,stiffness,energy dissipation of RC joins after fire.The results show that bearing capacity,stiffness and energy dissipation of the joints after fire are decreased significantly with the increase of corrosion rate.Though ductility of the joint with slight corrosion is increased slightly,the ductility of the joints is decreased on the whole with the increase of corrosion rate.Compared with the joint without corrosion,the range of reduction of corroded RC joints after fire could be as much as 37.93％ of yield load,28.11％ of ultimate load and 35.92％ of core shear bearing capacity.At last,a formula for the residual shear bearing capacity of RC joints was proposed considering the effect of the initial damage and high temperature on the rebar and concrete.The calculated results agree with the experimental data well.关键词
钢筋混凝土框架节点/钢筋锈蚀/高温试验/低周反复荷载试验/抗震性能/受剪承载力Key words
RC frame joint/reinforcement corrosion/fire test/low cyclic loading test/seismic behavior/shear bearing capacity分类
建筑与水利引用本文复制引用
李兴国,苗吉军,周莹萌,时盼盼,张伟星..锈蚀钢筋混凝土框架节点高温后抗震性能试验研究[J].建筑结构学报,2018,39(3):84-92,9.基金项目
国家自然科学基金项目(51179081). （51179081）
