建立了规则钢筋混凝土框架在不同破坏阶段最大地震位移形状曲线的计算方法,用于基于位移的抗震性能设计.通过对具有不同结构特性的框架在16条地震波输入下的大量非线性时程分析,研究了结构在三个不同破坏状态下的最大楼层位移反应与最大层间位移角、弹性第一自振周期、柱端弯矩增大系数的关系,并利用统计回归分析建立了它们之间的关系.研究表明,结构在不同破坏阶段的最大地震位移形状是有明显区别的.最后,对一座已完成振动台试验的12层框架模型进行了计算分析,计算结果与试验结果具有较好的一致性.
A new method is proposed to estimate the maximum seismic displacement profiles of regular moment resisting reinforced concrete (RC) frames at different damage states for displacement-based seismic design. A study is made of the relationship of the maximum floor displacement and the maximum story drift over the height, the elastic fundamental period, as well as the column-to-beam strength ratio for RC frames with different structural characteristics at three different damage states based on a lot of nonlinear time history analysis subjected to 16 ground motions. Based on statistical analysis of the results, the expressions are established to reveal the relationship of the maximum floor displacements and the main structural characteristics. The shape of the maximum displacement is quite different at different damage states. At last, a case study is conducted on a 12-story RC frame model tested on the shaking table before, and shows good agreement between the calculation and test results.