折叠装配式框架结构静力试验研究  

Static Test on Folding Prefabricated Frame Structures

作　　者：孙涛 王帅[2] 段茗爔 刘畅 严仁章[3] SUN Tao;WANG Shuai;DUAN Mingxi;LIU Chang;YAN Renzhang(Military Installation Department,Army Logistics Academy,Chongqing 401331,China;Chongqing Aerospace Polytechnic,Chongqing 400021,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]陆军勤务学院军事设施系,重庆401331 [2]重庆航天职业技术学院,重庆400021 [3]重庆交通大学土木工程学院,重庆400074

出　　处：《建筑钢结构进展》2024年第9期14-23,33,共11页Progress in Steel Building Structures

基　　金：重庆市教委科技项目(KJQN202403002,KJZD-K202112901)。

摘　　要：为获得折叠装配式框架结构的静力性能,设计了两个折展框架榀足尺试件,通过开展结构静力加载试验对单榀折展框架在不同荷载工况下的变形特征、承载性能与破坏形态进行了研究。试验结果表明:对于正常使用状态,进行静力加载时,有支撑的单榀框架结构整体变形处于弹性范围,水平作用下受推和受拉位移变化趋势基本一致,且增设支撑对折展框架的刚度影响较大;水平极限荷载作用下,有支撑的单榀框架结构在支撑连接处首先出现不可逆的塑性变形,单榀框架在边柱下端与下部拉条连接处发生局部破坏;上、下层梁柱节点弯矩-转角曲线变化趋势一致,但上层节点初始刚度明显弱于下层节点初始刚度,同层梁柱节点初始刚度基本相同;单榀框架的各关键点处等效应力在往复加载过程中推拉对称,结构总体处于安全状态。In order to obtain the static behavior of the folding prefabricated frame structure,the horizontal and vertical static loading tests of the two full-scale folding frames were carried out.In this paper,the deformation characteristics,bearing capacity and failure modes of the specimens are studied,and the mechanical behaviors of the specimens under different loading cases are analyzed,and the laws affecting the bearing capacity are obtained.The test results show that the overall deformation of the braced frame structure is in the elastic stage under static loading in the normal service state,and the positive and negative displacement trends under horizontal loading are basically the same.The addition of braces has a greater impact on the stiffness of the folding frame.When the horizontal ultimate load is applied,the unrecoverable deformation occurs at the brace connection of the braced frame structure first,and the local failure occurs at the connection between the lower end of the side column and the lower brace,which needs to be optimized.The moment-rotation curves of the upper and lower beam-column joints have the same trend,but the initial stiffness of the upper joint is significantly weaker than that of the lower joint,and the initial stiffness of the beam-column joints on the same floor is basically the same.The equivalent stress of each key point of the frame is equal in the process of reversed loading,and the structure is generally under a safe state.

关 键 词：折展框架 静力试验 极限承载力 节点刚度 破坏模式 

分 类 号：TU318[建筑科学—结构工程]