一种基于低通滤波的公路简支梁桥实测冲击系数计算方法

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 46-50.

论文

一种基于低通滤波的公路简支梁桥实测冲击系数计算方法

李伟钊1 张巍1 王宗林1 李岩1 王彦旭2

作者信息 +

A COMPUTING METHOD TO ESTIMATE TESTED IMPACT FACTOR OF HIGHWAY SIMPLY SUPPORTED GIRDER BRIDGE BASED ON LOW-PASS FILTER

LI Wei-zhao1 WANG Zong-lin1 LI Yan1 Wang Yan-xu2

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文章历史 +

摘要

分析现行公路桥梁评定规范中实测冲击系数计算中存在的问题；基于动力学理论推导移动力作用下简支梁的动力响应，分析其中的振动频率成分，得到对应静态分量的频段；提出通过频域低通滤波从简支桥梁的动力响应中提取相应的静力成分的方法；通过仿真分析介绍了动挠度响应提取静力成分进而计算冲击系数的具体过程；并将该方法应用于某简支梁桥跑车试验的冲击系数计算。结果表明：该方法方便、可靠，可供从事桥梁评定的人员参考。

Abstract

Some problems existing in the calculation of tested impact factor of current bridge assessment specification were analyzed. The frequency components in dynamic response of simple supported girder subjected to the moving force were investigated theoretically. A method using frequency domain low-pass filter to extract the static component from dynamic response was proposed. Simulation analysis introduced the process of extracting static displacement. This method was applied to a real bridge for the static displacement extraction and impact factor calculation. The results show that the method is convenient and reliable and provides reference for the calculation of experimental impact factor.

导出引用

李伟钊张巍王宗林李岩王彦旭. 一种基于低通滤波的公路简支梁桥实测冲击系数计算方法[J]. 振动与冲击, 2012, 31(20): 46-50

LI Wei-zhao WANG Zong-lin LI Yan Wang Yan-xu. A COMPUTING METHOD TO ESTIMATE TESTED IMPACT FACTOR OF HIGHWAY SIMPLY SUPPORTED GIRDER BRIDGE BASED ON LOW-PASS FILTER[J]. Journal of Vibration and Shock, 2012, 31(20): 46-50