不同截面类型简支梁桥动力冲击系数研究

发布时间：2018-06-16 12:36

本文选题：车桥耦合振动 + 动力冲击系数　；参考：《振动与冲击》2015年14期

【摘要】：针对我国《公路桥涵设计通用规范》JTJ 021-89及JTG D60-2004中分别采用跨度、基频计算桥梁动力冲击系数IM时均只考虑影响车桥耦合振动中一个因素不够准确问题,基于通用图集建立5座桥梁有限元模型,并用数值方法计算设定工况下的IM。将计算结果与两种规范设计值进行对比;分别比较跨径、基频相同的不同截面类型桥梁IM差异。结果表明,中等路面桥梁的IM计算结果较04规范设计值小,与89规范较接近;差路面情况下两规范设计值均远小于IM计算结果;不同截面桥梁的IM相差较大,说明仅用跨径或基频计算动力冲击系数不完全合理,由桥梁截面类型引起的动力冲击系数差异不可忽视。
[Abstract]:In view of the span adopted in JTJ021-89 and JTG D60-2004 in the General Code for Design of Highway Bridges and culverts in China, only one factor affecting the coupled vibration of vehicle-bridge is considered in calculating the dynamic impact coefficient IM of the bridge by the fundamental frequency. The finite element model of five bridges is established based on the general map set, and the IMM is calculated by numerical method. The calculated results are compared with the design values of the two specifications, and the IM differences of different cross-section types of bridges with the same span and the same fundamental frequency are compared respectively. The results show that the results of IM calculation of medium pavement bridges are smaller than those of Code 04, which are close to those of Code 89, and the design values of the two codes are far smaller than those of IM calculation results under the condition of poor pavement, and the difference of IM between different sections of bridges is larger. It shows that it is not completely reasonable to calculate the dynamic impact coefficient only by span or fundamental frequency, and the difference of dynamic impact coefficient caused by the type of bridge section can not be ignored.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金(51208189) 湖南省杰出青年基金(14JJ1014)
【分类号】：U441.3

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