钢骨混凝土剪力墙地震损伤性能分析

Analyses on seismic damage of steel reinforced concrete structural walls

根据钢骨混凝土剪力墙的试验结果,对构件在反复水平荷载作用下的损伤过程和累积滞回耗能进行了研究。分析了构件的裂缝开展过程及破坏性态,将剪力墙损伤发展分为三个阶段;给出了累积滞回耗能随加载循环水平的变化规律,得到了配箍率、配钢率对累积滞回耗能的影响。根据现有的损伤模型,对剪力墙试件的损伤指数进行了比较,提出各参数的计算方法,并对损伤模型进行了修正,使其适合于剪力墙的损伤评估。根据墙体不同阶段的损伤程度,将钢骨混凝土剪力墙结构的性能划分为使用良好、保证人身安全和防止倒塌三个性能水平,提出用损伤指数作为剪力墙结构的性能控制指标,给出不同性能水平下的宏观描述和相应的损伤指数,为钢骨混凝土剪力墙结构基于损伤的性能设计方法提供了依据。

Based on the experimental results of steel reinforce concrete(SRC) structural walls,the damage evolution of SRC walls under cyclic lateral load was researched.The crack distributing,developing rules and failure modes are analyzed and the damage evolution was divided into three levels.The variation history of accumulated hysteretic dissipated energy under different loading cycle levels are calculated.The influence of stirrup ratio and steel ratio on the accumulated hysteretic dissipated energy is researched.The damage index of SRC structural walls was calculated according to the modified damage model.The calculation method of characterized points is recommended.The modified seismic damage model was put forward to evaluate the damage of SRC structural walls correctly.According to different damage situation,three performance levels of SRC wall structure were suggested which were serviceability,life-safety and collapse-prevention.The damage index was used to control the different performance levels of SRC sturctural walls.The damage description and damage index are proposed for each performance level.It is a base for the seismic damage evaluation of SRC wall buildings.