钢管混凝土柱-钢梁错层节点地震损伤评估

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.

Earthquake Damage Evolution on Staggered Joints for Concrete-Filled Steel Tube Column-steel Beams

Abstract]: In order to study the seismic damage evolution low of the 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 low-cycle reciprocating loading tests, the nonlinear combination relationship between deformation and energy during the cyclic loading of the specimen is studied.Based on the earthquake damage mechanism of column-steel beam staggered joints of concrete-filled steel tubular, a two-parameter seismic damage model suitable for column-steel beam staggered joints of concrete-filled steel tubular is proposed. The data is obtained through low-cycle reciprocating loading tests. Based on the two-parameter seismic damage model, the seismic damage index is calculated to quantitatively describe the damage evolution law of the column-steel beam staggered joints of concrete-filled steel tubular under earthquake action. The effects of axial compression ratio, staggered height and shear compression ratio on seismic damage of column-steel beam staggered joints of concrete-filled steel tubular are analyzed. It was found that the specimens with a small axial compression ratio tended to advance in the damage process. The cumulative damage was greater than that of the specimens with a large axial compression ratio, the damage development and accumulation of the specimens with a large staggered height were greater than that of the specimens with a small staggered height, and the cumulative damage of the specimens with a large shear pressure ratio was greater than that of the specimens with a small shear pressure ratio.