【摘要】 对未加固和采用防屈曲支撑加固后的某框架结构进行了罕遇地震作用下的连续倒塌比较分析。分析结果表明,未加固的框架结构在罕遇地震作用下产生了连续倒塌,采用防屈曲支撑加固后的框架结构在罕遇地震作用下未产生倒塌,最大层间位移角达到1/59,部分框架柱边缘混凝土出现压溃但未全截面压溃,但底层部分防屈曲支撑退出工作。防屈曲支撑起到了较好的消能减震作用,提高了结构的抗震性能,可见采用防屈曲支撑进行加固是必要的,提及的分析方法可为带消能减震构件的结构防连续倒塌分析提供参考。更多还原

【Abstract】 Under rare earthquake action,progressive-collapse analysis of a structure strengthened with buckling restrained brace and unstrengthened structure was conducted. The analysis results show that the unstrengthened structure continuously collapses under rare earthquake action while the structure strengthened with buckling restrained brace does not occur progressive-collapse under rare earthquake action and the maximal story drift angle reaches 1 /59. Edge concrete of some frame columns crush but not for the whole cross section,and part of the bulking restrained braces on the bottom floor are out of working. Buckling restrained braces play a significant role in energy dissipation,and seismic performance of the structure has been improved. Thus,it can be seen that it is necessary to adopt buckling restrained brace for structure and the proposed method can be used to study the progressive-collapse prevention of structure with energy dissipation components.更多还原