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针对Push-over分析方法的特点,对等效单自由度提出了一种新的等效方法。主要假设施加于框架结构上的侧向分布荷载是动力荷载,因此可用等效侧向荷载代替动力平衡方程中的地震作用,直接利用基底剪力一顶点位移曲线,避免了一般等效方法中的转换过程;同时利用强度折减系数对弹性加速度反应谱进行折减,根据等效周期求出相应目标位移,避免了复杂的迭代过程;最后用该方法对一框架进行了分析计算。结果表明:该方法简单实用,对结构计算分析具有一定的参考价值。
Aiming at the characteristics of Push-over analysis method, a new equivalent method is proposed for equivalent single degree of freedom. It is mainly assumed that the lateral distributed loads applied to the frame structure are dynamic loads so that the equivalent lateral load can replace the seismic effect in the dynamic equilibrium equation and the direct use of the base shear-vertex displacement curve avoids the common equivalent method At the same time, the intensity reduction coefficient is used to reduce the elastic acceleration response spectrum, and the corresponding target displacement is calculated according to the equivalent period, which avoids the complicated iterative process. Finally, a framework is analyzed and calculated by this method. The results show that this method is simple and practical and has certain reference value for structural calculation and analysis.