铁路钢-混凝土结合梁动力系数试验研究及参数分析  

Tests and parametric analysis for dynamic factor of railway steel-concrete composite beams

作　　者：李运生[1] 李帅[1] 张彦玲[1] 

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《振动与冲击》2014年第11期189-194,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51108281);国家支撑计划项目(2011BAJ09B02);河北省自然科学基金(E2014210038)

摘　　要：以抗剪连接度为参数设计了2片钢-混凝土简支结合梁,对车辆模型以不同速度和重量过梁时的动力响应进行了测试;采用ANSYS软件建立了车桥模型,分析了行车速度、结合梁跨度、车桥频率比、车桥质量比、栓钉抗剪连接度等参数对结合梁桥动力系数的影响。结果表明:随车辆速度的增加,结合梁动力系数呈共振和消振交替上升趋势;动力系数随车桥频率比的增大而增大,随结合梁跨度、栓钉抗剪连接度和车桥质量比的增大而减小,车桥质量比越小,动力系数下降速度越快。所有参数中,结合梁跨度和车桥频率比对动力系数的影响最大。The dynamic vehicle model tests were conducted on two steel-concrete simply-supported composite beams taking shear connection ratio as a parameter,the dynamic responses of the beams were measured when a train model passed through the beams at different speeds and with different weights.The train-bridge finite element model was built with ANSYS software,and the influence of some parameters on the dynamic factor of the composite beams were analyzed,these parameters included train speed,beam span,frequency ratio of train to beam,weight ratio of train to beam,and shear connection ratio.The results showed that the peaks of the dynamic factor of the composite beams appear at the resonant points and the anti-resonant ones; the dynamic factor increases with increase in frequency ratio of train to beam,but decreases with increase in beam span,shear connection ratio,and weight ratio of train to beam; the smaller the weight ratio of train to beam,the faster the drop speed of the dynamic factor; in all parameters,the span of the composite beams and the frequency ratio of train to beam have the largest effects on the dynamic factor of the beams.

关 键 词：钢-混凝土结合梁 动力系数 模型试验 有限元分析 动力响应 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]