偏心结构考虑扭转的三维Pushover分析

运用三维Pushover方法对偏心框架结构进行分析,通过与对称结构的屈服机制、能力曲线和层间位移的对比,得到其地震扭转反应特征.由于Pushover分析未考虑结构高阶振型的影响,对于偏心结构而言,其结果与时程分析结果偏差较大.在Fajfar提出的N2方法的基础上,考虑扭转振型对结构的影响,提出了Pushover分析结果的修正方案.在算例中,分别用N2方法和建议的方法对Pushover分析结果进行组合,结果表明在偏心率较大的情况下,建议的方法具有更好的精度.

3D Pushover analysis of asymmetric structure with torsional effect

3D Pushover analysis is performed on asymmetric structures. Contrast the yielding mechanism, capacity curve and storey displacements to those of corresponding symmetric, the character of seismic response of asymmetric structure can be found. In previous analysis, the result of Pushover always has some error with the result of time-history. To solve this problem, based on N2 method oriented by Fajfar, a new method with regard of torsional effect is presented in this paper. And good accuracy is obtained in the examples.