中文摘要：

尽管近年来国内外学者提出了多种基于位移的抗震设计方法，但采用的与位移相关的反应谱大多是平均谱，设计过程可以看作是确定性的。基于位移的抗震设计应该建立在可靠度理论基础之上。利用作者在概率延性需求谱方面已有的研究成果和可靠度分析方法——验算点法，本文提出了根据基于位移的目标可靠指标直接进行结构设计的方法，并给出了设计流程图。为便于工程应用，在进行了大量分析计算之后，本文建议了基于位移的概率极限状态分项系数设计表达式，并确定了其中的分项系数。最后，本文对一8层框架结构采用建议的分项系数设计表达式进行了设计，并对有待于进一步研究的问题进行了简要分析。

英文摘要：

Recently many displacement-based seismic design methods have been proposedby researchers. In most of these methods the average displacement-related spectra are adopted, and the design procedure can be considered determinate. Displacement-based seismic design should be based on the reliability theory. Utilizing the authors＇ research results on probabilistic ductility demand spectrum and the reliability analysis method, such as checking point method, the direct probabilistic design procedure and the flowchart to reach the displacement-based target reliability index are presented. By a large amount of computation and analysis, a practicable partial coefficient design expres- sion based on probabilistic limit states design is proposed, and a group of optimal partial coefficients are obtained, In the end, an eight-story structure is designed by using the proposed partial coefficient design expression, and the deficiency of this method is indicated.