一种冗余交替荷载路径动态放大系数的近似方法及钢桁架桥梁的渐进倒塌线性静力分析

Hoang Trong Khuyen , Eiji Iwasaki
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引用次数: 16

摘要

采用动态放大系数(DAF)的交替荷载路径线性静力分析方法对钢桁架桥梁进行冗余分析和递进倒塌分析,避免了较耗时的动力分析。本研究提出了一个经验方程来计算这种类型的分析对初始构件突然断裂的DAF。目前,该分析采用单自由度近似模型来计算DAF。当阻尼比为5%时,所有类型的钢桁架桥梁均采用恒定DAF为1.854。然而,这种方法是不准确的,因为DAF在桥梁之间和断裂构件的位置也不同。考虑到一些用于建筑结构的方法,但使其适用于钢桁架桥梁,本文提出了一个经验方程,允许从最大范数应力σis/σiy计算破坏模型的静态线弹性分析中,构件的移除。本文对两座典型钢桁架桥梁的30个实例进行了研究,以获得经验方程的数据点。所提出的经验方程是在说明性案例中数据点的最佳拟合线的包络线偏移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An approximate method of dynamic amplification factor for alternate load path in redundancy and progressive collapse linear static analysis for steel truss bridges

Linear static analysis with an alternate load path using dynamic amplification factor (DAF) is often used for redundancy and progressive collapse analysis of steel truss bridges to avoid using the more time-consuming dynamic analysis. This study presents an empirical equation to calculate the DAF for this type of analysis against the initial sudden member fracture. Currently, this analysis employs an approximate model with a single degree of freedom to calculate the DAF. With a 5% damping ratio, the constant DAF of 1.854 is used for all types of steel truss bridges. However, this approach is inaccurate because the DAF varies between bridges and with the location of the fractured members as well. Considering some of the approaches developed for building structures but adapting them to steel truss bridges, this paper proposes an empirical equation that allows for the computation of the DAF from the maximum norm stress σis/σiy in static linear elastic analysis of the damaged model with a member removal. A total of 30 illustrative cases for two typical steel truss bridges are investigated to obtain the data points for the empirical equation. The proposed empirical equation is the enveloped line offset from the best fit line for the data points in illustrative cases.

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