基于位移模式的能力谱法结构抗震性能评估

Assessment on structural performance by displacement pattern-based capacity spectrum method

能力谱法是结构非线性静力分析的主要方法,阐述了能力谱法的基本原理,提出了基于位移模式的Pushover方法,并用该方法计算结构的能力曲线;分析了等效单自由度方法和等价线性化方法,建立基于位移模式的等效单自由度体系,基于位移模式对结构进行往复Pushover分析得到等效体系的参数,对结构进行抗震性能评估,并通过算例验证本文所提出方法的可靠性,计算结果较好地反应了结构的非线性行为.

Capacity spectrum method is the primary method for nonlinear static analysis and the basic principles of this method are introduced in this paper.The displacement-pattern-based pushover method is proposed and the capacity curve of structure is obtained by this method.The equivalent single-degree-of-freedom method and equivalent linearization method is analyzed and MDOF system is converted into equivalent SDOF system.Based on the reciprocating pushover,equivalent system parameters are obtained and the seismic performance of the structure is evaluated.The displacement response of structure can be determinate by elastic demand spectrum.A practical example of frame structure is used to validate this methodology.The results can reflect the nonlinear behavior of the structure.