基于能量方法设计的人字形中心支撑钢框架抗近场地震倒塌能力研究

Resertch on near-field sesismic collapse capacity of inverted-V CBSF based on energy-based sesismic design method

近年来国内外学者提出了各有特色的性态的设计方法,但其设计结果是否满足结构抗倒塌安全储备的基本要求,尚需进行研究。依据美国FEMAP695的结构抗地震倒塌性能评估体系,采用增量动力时程分析法,对近场地震下按文献[1]基于MECE谱能量设计方法设计的人字形中心支撑钢框架进行了抗强震倒塌富余度及易损性分析,以评估此能量设计方法的可行性。结果表明:基于文献[1]方法设计的人字形中心支撑钢框架的抗震倒塌富余度CMR值及易损性指标均满足要求,文献[1]的设计方法是可信的。

In recent years, many researchers have proposed variRRRRRous perfonnance-based seismic design methods, but whether the methods satisfy the basic requirements of the safety reserve of the earthquake resistance capability of structural needs to be studied. In order to assess the energy-based seismic design method based on MECE spectrum under the near-field earthquake which was mentioned in the literature [1], this paper, according to the seismic collapse assessment system in FEMAP695, uses the incremental dynamic analysis method to ana-lyze the collapse margin ratio （ CMR） of the two inverted-V CBSFs which were designed by that method. The re-sult shows that the CMR and the fragility index all meet the need of the assessment system, and the design method in literature [1] is credible.