高负载下焊接加固方管钢柱受力性能研究  

Study on mechanical performance of welded reinforced square steel column under high loads

作　　者：刘红波[1,2] 孙沛钊 陈志华 张士硕[1] LIU Hongbo;SUN Peizhao;CHEN Zhihua;ZHANG Shishuo(School of Civil Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,China;Key Laboratory of the Ministry of Education on Binhai Civil Engineering Structure and Security,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]河北工程大学土木工程学院,河北邯郸056038 [3]天津大学滨海土木工程与安全教育部重点实验室,天津300072

出　　处：《建筑结构学报》2023年第8期149-158,共10页Journal of Building Structures

基　　金：河北省杰出青年基金项目(E2021402006)。

摘　　要：为研究高负载下焊接加固方管钢柱中钢柱与角钢截面之间的协同工作性能,对4个Q235方管柱轴压构件进行了高初始应力比下的焊接加固试验,并用重复加载的方式模拟实际工程中的荷载变化。试验中测量了方管钢柱与角钢的应变及位移变化过程,采用间接-热结构耦合有限元方法对焊接加固过程进行分析,并使用弹塑性力学的方法对焊接加固后方管钢柱与角钢截面的应力变化进行理论分析。结果表明:对于材料强度控制的轴压方管钢柱,重复加载过程基本不影响其承载力;焊接加固后,随着荷载的重复变化,方管钢柱与角钢之间协同工作性能良好,方管钢柱是否达到塑性工作状态与加载历史有关,在高初始应力比0.8和0.9下进行焊接加固可行。To study the cooperative working performance between steel column and angle steel sections of welded reinforced square steel columns under high load,the welding reinforcement tests of four Q235 square steel column axial compression members under high initial stress ratio were carried out.The load variation in the actual engineering practices was simulated by repeated loading.In the experiments,the strain and displacement variation process of the square steel column and the angle steel sections were measured,the indirect thermal-structural coupling finite element analysis(FEA)method was used to analyze the welding strengthening process,and the stress laws of the square steel column and the angle steel sections after welding reinforcement were theoretically analyzed by the elasto-plasticity theory.The results show that for the axially compressed square steel column governed by strength failure,the repeated loading process hardly affects its bearing capacity.After welding,with the repeated change of live load,the cooperative working performance between the square steel column and the angle steel sections is good.Whether the square steel column reaches the plastic working state or not is related to the loading history,and welding reinforcement is feasible under a high initial stress ratio of 0.8 and 0.9.

关 键 词：方管钢柱 焊接加固 高负载 重复加载 应力变化机理 

分 类 号：TU392.3[建筑科学—结构工程]