汽车动力作用对曲线梁桥地震反应特性的影响分析

Effect of vehicles on seismic response characteristics of curved girder bridges

为探讨移动车辆作用对曲线梁桥地震反应的影响,采用模态综合技术,提出考虑地震作用的曲线梁桥车桥耦合振动分析方法。以4×40 m曲线连续梁桥和典型3轴重车为对象,编程分析车辆动力作用下曲线梁桥地震反应特性,研究车辆关键参数、不同地震动类型等因素对曲线梁桥地震反应的影响。研究结果表明:增加车重和车速,结构地震响应受到车辆作用的影响增大;提高地震动峰值,车辆作用对桥梁地震响应的影响减弱;不同场地条件下,车辆作用对桥梁地震反应的影响存在明显差异,地震波频率集中时影响较大。

To study the effect of moving vehicle load on the seismic responses of curved girder bridge,by using modal synthesis technology,a method for analyzing the vehicle-bridge coupled vibration of curved girder bridge and considered the ground motion was proposed.By taking 4×40 m curved bridge and a typical 3-axial vehicle as examples,the related programs were compiled to analyze the seismic responses characteristics of curved girder bridges under vehicle dynamic action,and the impact of vehicle parameters,different ground motion types and other factors on the seismic responses of curved girder bridges were studied.The results suggest that with the augment of vehicle weight and speed increase,the effect of vehicle load on bridge seismic responses is greater than before.While the effect decreases when the peak value of ground motion becomes higher.Besides,the effect of vehicles on bridge seismic responses was significantly different under different site conditions,and the effect is greater when the seismic wave frequency distribution is concentrated.