摘要
为研究地震作用下钢管混凝土柱-钢梁错层节点的地震损伤演化规律,进行了8个钢管混凝土柱-钢梁错层节点的低周往复加载试验。基于低周往复加载试验的研究成果,研究了试件循环加载过程中变形和能量的非线性组合关系。从钢管混凝土柱-钢梁错层节点地震损伤破坏机理出发,提出适合于钢管混凝土柱-钢梁错层节点的双参数地震损伤模型。通过低周往复加载试验得到数据,基于双参数地震损伤模型,计算其地震损伤指数,定量地描述钢管混凝土柱-钢梁错层节点在地震作用下的损伤演化规律。对钢管混凝土柱-钢梁错层节点地震损伤评估,分析了轴压比、错开高度和剪压比对错层节点地震损伤的影响。发现轴压比小的试件在损伤过程中会有所提前,累积损伤比轴压比大的试件大,错开高度大的试件的损伤发展与累积大于错开高度小的试件,剪压比大的试件的累积损伤大于剪压比小的试件。
In order to study the seismic damage evolution low of column-steel beam staggered joints of concrete-filled steel tubular under earthquake action,low-cycle reciprocating loading tests of 8 column-steel beam staggered joints of concrete-filled steel tubular were carried out.Based on the research results of the low-cycle reciprocating loading test,the nonlinear combination relationship between deformation and energy during the cyclic loading of the specimen was studied.Starting from the earthquake damage mechanism of the column-steel beam staggered joints of concrete-filled steel tubular,a two-parameter seismic damage model suitable for the column-steel beam staggered joints of concrete-filled steel tubular was proposed.The data was obtained through low-cycle reciprocating loading test.Based on the two-parameter seismic damage model,the seismic damage index was calculated,and the damage evolution law of the column-steel beam staggered joints of concrete-filled steel tubular under earthquake action was quantitatively described.Through the seismic damage assessment of the column-steel beam staggered joints of concrete-filled steel tubular,the effects of axial compression ratio,stagger height and shear-compression ratio on the seismic damage of staggered joints were analyzed.It is found that the damage process of the specimen with a small axial compression ratio will be advanced,and the cumulative damage is larger than the specimen with a large axial compression ratio,the damage development and accumulation of specimens with large stagger height is greater than that of specimens with small stagger height,and the cumulative damage of specimens with large shear-compression ratio is greater than that of specimens with small shear-compression ratio.
作者
许成祥
魏锦涛
樊鸿博
郭骁
XU Cheng-xiang;WEI Jin-tao;FAN Hong-bo;GUO Xiao(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China)
出处
《科学技术与工程》
北大核心
2021年第12期5031-5037,共7页
Science Technology and Engineering
基金
国家自然科学基金(51678457)。
关键词
钢管混凝土柱
钢梁错层节点
损伤模型
损伤评估
concrete-filled steel tube column
staggered joints of steel beams
damage model
damage evolution
