中文摘要：

合理的设计承载力取值能确保结构满足各性能水平的承载力需要。本文将多自由度结构等效为相应的单自由度体系，并假定单自由度体系为理想弹塑性体；根据结构各性能水平的目标位移，由能力谱法确定相应的实际承载力需求，取其中最大值作为结构实际承载力需求；引入超强系数定义结构实际承载力与设计承载力的比例关系，进而由实际承载力需求除以超强系数得到结构设计承载力，以此为依据对结构构件进行截面承载力设计，确保了结构能够满足性能目标要求。通过例题说明了本文方法的计算过程，并由静力弹塑性分析验证了其可行性。

英文摘要：

The reasonable value of design bearing capacity can ensure that the structure satisfies its bearing capacity demand of each performance level. The multi-degree-of-freedom system is transformed into equivalent single-degree-of-freedom （ESDOF） system, and the ESDOF system is assumed to be perfectly elasto-plastic. Based on the structural target lateral displacement, the actual bearing capacity demand of each performance level could be determined by capacity spectrum method and the maximum is regarded as the structural actual bearing capacity demand. The over-strength coefficient is defined as the ratio of actual beating capacity to design beating capacity. The actual beating capacity demand divided by over-strength coefficient equals to the design bearing capacity, which ensures the structure meeting its performance objective. The paper illustrates the application of the proposed method with an example and this, method is proved to be feasible by pushover analysis.