【摘要】 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。更多还原

【Abstract】 A new equivalent non-liner single-degree-of-freedom system is proposed.The main assumption of this paper is that the masses of the frame are loaded with lateral external dynamic forces so that the equivalent dynamic forces can substitute the seismic demand.Thus the curve of base shear forces-top displacement diagram can be used directly and the conversion of the common equivalent method can be avoided;Besides,the iteration is avoided by reducing the elastic spectrum through the strength reduction factor and calculating the target displacement according to the equivalent period.Finally,this method is verified by a six-story regular frame system.The results show that,this method is simple and practical,and it has certain reference significances for structure analysis.更多还原