基于剪切破坏的剪力墙构件地震损伤

Shear failure test and seismic damage analysis of shear walls

基于性能的抗震设计特点是使结构抗震设计从宏观定性目标转化为具体量化指标的多重结构性能目标。《建筑抗震设计规范》(GB 50011)给出的是针对整体结构弹性及弹塑性变形的变形指标量,对构件没有量化的损伤指标,为此,进行了5片配置HRB600级钢筋T型截面剪力墙试件的低周反复加载抗震抗剪性能试验,研究配置高强钢筋与普通钢筋剪力墙之间的抗震性能差异;收集剪力墙抗剪试验数据对Park-Ang双参数地震损伤模型进行参数修正,得到适用于剪切破坏下剪力墙构件的损伤模型。利用修正的损伤模型来评估发生剪切破坏的剪力墙各个受力阶段的损伤程度,结合剪力墙的变形状态进行损伤评估,给出不同性能状态下与剪力墙构件位移角的量化关系限值。

The characteristic of performance-based seismic design is that the structural seismic design is transformed from macroscopic goal to specific multiple objectives.At present,the national code《Building Seismic Design Code》（GB50011）only provides the deformation index of the elastic and elastic-plastic for the whole structure,not for individual components,without quantifying the damage index.Therefore,this paper firstly carried out the reversed cyclic load tests on shear behavior for 5 T-section RC shear walls with HRB600 steel bars,and the aseismatic performance differences between high-strength bars and ordinary bars of shear wall was studied.Combined with the experimental results of shear resistance performance worldwide,the modified Park-Ang double-parameter seismic damage model is proposed,which can capture the seismic damage of shear wall under shear failure.The modified damage model can evaluate shear wall＇s damage degree during different loading phases.Based on the damage assessment of shear wall member,quantization indexes of different performance levels for displacement angles of RC shear wall structure were proposed.