基于位移模式的改进能力谱法结构位移反应分析

能力谱法是基于性能抗震设计方法中结构位移反应分析的有效方法之一。为了克服常规的能力谱法在评估结构地震反应时只考虑结构第一振型的局限性,本文作者提出了基于位移模式的改进能力谱法,引入考虑多振型的位移模式,介绍了该方法的实施步骤,基于位移模式对结构进行Pushover分析得到体系的能力曲线,采用等效阻尼比和延性系数得到需求谱,从而计算结构的位移响应,并通过算例验证本文所提出方法计算结果的可靠性。

Displacement-pattern-based improved capacity spectrum methods for analysis of structural displacement response

Capacity spectrum method is one of the effective methods for structural displacement response analysis of performance based seismic design method. The conventional capacity spectrum methods only consider the first vibration mode in the assessment of the seismic responses. In order to overcome this limitation, the displacement-pattern-based improved capacity spectrum methods is proposed and the implementing process of this method is introduced. The selected displacement-pattern can consider multiple vibration modes. The capacity curve of capacity spectrum method is obtained by displacement-based Pushover method. The demand spectrum is obtained by equivalent damping ratio and ductility coefficients. And the displacement response of structure can be determinate by the demand spectrum. A practical example of frame structure is used to validate this methodology.