基于修正Park-Ang模型的型钢混凝土异形柱框架节点地震损伤研究  

Seismic damage of SRC special shaped column frame joints based on modified Park-Ang model

作　　者：陈宗平[1,2] 徐金俊[1] 陈宇良[1] 薛建阳[2] 梁莹[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《建筑结构学报》2015年第8期90-98,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(50908057);广西研究生教育创新计划项目(YCBZ2012005)

摘　　要：为了研究型钢混凝土(SRC)异形柱框架节点的地震损伤评估,考虑Park-Ang损伤模型存在数值收敛性差及适用范围受限的不足,结合异形柱结构力学特性,通过引入组合系数提出了适用于SRC异形柱框架节点地震损伤的Park-Ang修正模型。根据低周反复荷载作用下SRC异形柱框架平面与空间节点的实测滞回数据,确立了组合系数的计算方法,并对各试验影响因素进行了损伤演化分析。研究结果表明:SRC异形柱框架节点的修正Park-Ang模型损伤指数最大接近1.0,较好地满足了数值收敛性,且理论上更为合理;当水平加载角为45°时,T形截面柱空间节点的损伤水平最低,而十形截面柱空间节点则与之相反;在一定范围内,增大轴压比能延缓SRC异形柱框架节点的地震损伤;配钢形式对平面节点的损伤影响不大,对于空间节点的损伤水平的影响,配槽钢试件的比配T形钢试件的大,配空腹式钢试件的比配实腹式钢试件的大;L形截面柱的节点损伤程度较十形截面柱的大,而十形截面柱的节点损伤发展与累积则远大于T形截面柱节点。To research the seismic damage assessment mechanism of SRC special shaped column frame joints,the modified Park-Ang seismic damage model was put forward by introducing the combination coefficient based on the mechanical characteristics of special shaped column structures,due to the poor numerical convergence and limited application scope of Park-Ang damage model. The calculation method of combination coefficient for SRC special shaped column frame joints was built according to the measured hysteresis data under low cyclic reversed loading,and the effects of test parameters on the damage evolution of specimens were analyzed. The results show that the damage index calculated by modified Park-Ang seismic model is close to 1. 0 in the upper boundary of this model,it meets the numerical convergence better and it is more reasonable in theory. Under the loading angle of 45°,the damage level of T-shaped column 3D joints is the lowest,while the damage level of cross-shaped column 3D joints is on the contrary.Within certain limits,an increase of axial compressive ratio leads to delay the seismic damage of SRC special shaped column frame joints. There is no noticeable impact of shape steel configuration on the damage of planar joints; while for 3D joints,the damage level of the specimens configured with channel-shaped steel is higher than that of the specimens configured with T-shaped steel,and the damage level of the specimens configured with empty-web steel is higher than that of the specimens configured with solid-web steel. The damage degree of the specimens formed with L-shaped column is larger than that of the specimens formed with cross-shaped column,while the damage development and accumulation of the specimens formed with cross-shaped column is larger than that of the specimens formed with T-shaped column.

关 键 词：型钢混凝土异形柱 平面节点 空间节点 Park-Ang修正模型 组合系数 损伤指数 

分 类 号：TU398.9[建筑科学—结构工程]