填充墙钢筋混凝土框架结构基于位移的改进抗震设计方法

按现行抗震规范设计的底部空框架填充墙钢筋混凝土框架结构，可能无法实现“强柱弱梁”的预期延性破坏机制。为此，建立了填充墙与主体框架协同作用的等效斜撑-框架模型，改进等效单自由度体系阻尼比与刚度的确定方法，提出了填充墙钢筋混凝土框架结构基于位移的抗震设计方法；针对底部为空框架的填充墙钢筋混凝土框架结构进行不同性能目标下的静力推覆分析，实现其“使用良好”、 “修复后使用”和“防止倒塌”性能水平的抗震设计。采用动力弹塑性时程分析方法和能力谱法验证了基于位移的改进抗震设计方法的有效性。分析表明，应用基于位移的改进抗震设计方法，可综合考虑填充墙对主体框架的利弊作用，实现结构性能抗震设计目标。

Advanced displacement-based seismic design method of reinforced concrete frame structures with infill wall

According to the current seismic design code, it is possible not to obtain the expected failure mechanism of “strong column and weak beam” for reinforced concrete (RC) frame structures without infill walls at the bottom. The equivalent diagonal bracing-frame model was established to consider the interaction between the infill wall and frame members. Calculation of equivalent damping ratio and the equivalent stiffness were improved for an equivalent single-degree-of-freedom system. The displacement-based seismic design method was presented for RC frame structures with infill wall. Aiming at different performance levels for a five story RC frame structure without infill walls at the bottom, displacement-based seismic performance design were carried out in order to satisfy the performance levels of serviceability, life-safety, and collapse prevention by means of structural pushover analysis. Furthermore it is proved that this method is feasible by means of both capacity spectrum method and dynamic elasto-plastic time history analysis method. Therefore it can be shown that performance-based seismic design can be achieved by taking both advantages and disadvantages of infill walls to the frame members into account by means of the advanced displacement-based seismic design method.