【摘要】 通过对汶川、玉树、芦山地震中几组框架结构的典型破坏案例的分析对比,指出了产生框架结构底层薄弱的层屈服机制的主要原因和破坏过程,并提出了在框架结构中增设阶梯墙的加固改进方案。分别采用推覆分析方法和基于IDA的结构倒塌储备系数分析方法对一个典型框架结构和一个阶梯墙框架结构进行了分析研究。计算分析结果表明,阶梯墙在结构的整体承载力储备和变形能力,冗余度和整体性,以及合理的屈服机制三个层面上均能对框架结构的抗地震倒塌能力起到很好的改进作用。更多还原

【Abstract】 The main reason and failure process of the bottom yielding mechanism of RC frame structure are pointed out through some typical damaged structures in the Wenchuan,Yushu and Lushan earthquakes.Strengthening method of adding the stepped wall into the RC frame is proposed.The collapse resistance of an ordinary RC frame and a stepped wall-frame structure is analyzed with pushover analysis and collapse margin ratio analysis,which is based on incremental dynamic analysis.The study proves that the stepped wall can improve the collapse resistance of RC frame in the global loading resistance,lateral deformation,redundancy and rational yield mechanism.更多还原