Abstract The main contribution of this paper is to develop a new multi-mode adaptive pushover analysis procedure for estimating the seismic demands of RC moment-resisting frames. The proposed procedure enhances the seismic demands of conventional pushover analysis methods by combining the advantages of ‘multi-modal’ and ‘adaptive’ pushover procedures. The presented method, which has been named the multi-mode adaptive displacement-based pushover (MADP) analysis procedure, estimates the seismic demands of buildings by using several multi-stage modal pushover analyses. Each multi-stage pushover analysis begins with the lateral load pattern proportional to the elastic mode-shape. The pushover analysis is then continued with a new lateral load pattern, constructed based on the story displacements obtained from the previous stage. The lateral force distribution is changed whenever a new plastic hinge is formed in the inelastic structural model. The ‘first-mode’ inelastic mode-shape of the structure is also used by the MADP method to accurately estimate the value of the target-displacement. The final structural responses are determined by combining the seismic demands obtained by the multi-stage modal pushover analyses using an appropriate modal combination rule. The accuracy and efficiency of the MADP procedure is verified using the analysis of four special RC moment-resisting frames with 4-, 8-, 12-, and 20-stories. The structural responses are estimated for two different seismic hazards (intensities). A comparison is then carried out between the estimates from the MADP method with those given by the exact nonlinear response history analysis (RHA). The results from two advanced pushover analysis procedures including the modal pushover analysis (MPA) and consecutive modal pushover (CMP) methods are also presented for the purpose of comparison. The results show that the MADP method is able to satisfactorily estimate the critical seismic demands such as interstory drift ratio and the plastic rotation of the hinges for the example buildings, and to provide an advanced nonlinear static procedure for the seismic performance assessment of RC moment-resisting frames.

中文翻译：

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用于估算 RC 抗弯框架抗震要求的多模态自适应 Pushover 分析程序

摘要 本文的主要贡献是开发了一种新的多模态自适应推覆分析程序，用于估计 RC 抗弯框架的抗震要求。所提出的程序通过结合“多模态”和“自适应”Pushover 程序的优点，提高了传统 Pushover 分析方法的抗震要求。所提出的方法，已被命名为多模态自适应位移基推覆 (MADP) 分析程序，通过使用多个多阶段模态推覆分析来估计建筑物的抗震要求。每个多阶段 Pushover 分析都从与弹性模态形状成正比的横向载荷模式开始。Pushover 分析然后继续使用新的横向荷载模式，该模式基于从前一阶段获得的楼层位移构建。每当在非弹性结构模型中形成新的塑性铰时，侧向力分布就会发生变化。MADP 方法还使用结构的“第一模态”非弹性模态形状来准确估计目标位移的值。最终的结构响应是通过使用适当的模态组合规则组合多阶段模态推覆分析获得的地震需求来确定的。MADP 程序的准确性和效率通过对 4、8、12 和 20 层的四个特殊 RC 抗弯框架的分析得到验证。结构响应是针对两种不同的地震灾害（强度）进行估计的。然后将 MADP 方法的估计值与精确非线性响应历史分析 (RHA) 给出的估计值进行比较。出于比较的目的，还提供了包括模态推覆分析 (MPA) 和连续模态推覆 (CMP) 方法在内的两种高级 Pushover 分析程序的结果。结果表明，MADP方法能够令人满意地估计示例建筑物的层间漂移比和铰链塑性旋转等关键抗震要求，并为RC力矩的抗震性能评估提供先进的非线性静力程序。抵抗帧。