中文摘要：

对于结构连续性倒塌过程中的动力特性通常有两种考虑方式,一是直接采用动力的分析方法,二是通过荷载动力放大系数（DIF）将静力荷载进行放大,从而间接模拟结构的动力响应.本文首先对荷载动力放大系数的研究现状进行介绍,并给出了一种考虑初始状态的等效构件模拟方法.利用变换荷载路径法对一空间网架结构支撑柱突然失效,并通过线性静力和线性动力的计算比较,研究静力计算中荷载动力放大系数的取值问题.计算显示,在空间网架结构中,DIF取值为2.0是合适的.

英文摘要：

There are two methods for the dynamic effect analysis of progressive collapse.The first one is the direct integral method for the dynamic equation,and the other is the dynamical increasement factor（DIF） of static analysis.Firstly,the research of the DIF was introduced.Then the simulation method of elements to be removed was discussed,and the initial condition of structure before the local damage was considered.The behavior of a space truss structure under the column loss was studied with the alternate path method.By comparing the results of linear static analysis and linear dynamic analysis,the DIF for the space truss structure was discussed.The results show that the DIF for the space truss structure should be 2.0.