拱桥实测冲击效应统计分析

The Statistics Analysis of Arch Bridge’s Measured Impact Effect

拱桥结构设计中需要考虑到移动荷载对拱桥结构的冲击力大小,有效评价桥梁结构冲击系数大小具有研究意义,有利于改进桥梁设计、方便桥梁后期养护。在收集了大量拱桥荷载试验实测数据后,分析各个拱桥的冲击系数。利用统计学软件SPASS中几种常用的数学模型对提取的拱桥冲击系数进行分析拟合,对拟合的几种函数公式分析判别,建立了最优的拱桥实测基频-应变增大系数关系函数,并利用拟合后函数取值与桥梁实测值进行比较,验证公式的有效性。

Deflection coefficient of impact is the dynamic effect of bridge integral parameter,the increased strain coefficient is the bridge of local index,the two are not synonymous.But the test often used in bridge strain increasing coefficient reflected shock effect,by a plurality of cross section layout of a number of measurement points to achieve,achieve from local to the whole shift effect.However,the measured strain increment coefficient and no evaluation index.On the collection of large amount of measured data,and then using the statistical software SPASS selection of several mathematical models were established after the best deck type arch bridge of concrete measured fundamental frequency strain increasing coefficient correlation function,and the use of fitting function value and the measured value is compared to the bridge,and verifies its effectiveness.