基于阻尼对连续梁桥冲击系数影响的研究

Study on Damp in Impact Coefficient of Continuous Girder of Bridge

参照简化的车辆模型和桥梁模型,建立了车-桥相互作用的数学模型.给出了在移动荷载作用下连续梁桥各截面动力响应的时程曲线和连续梁桥前几阶模态的振型曲线,通过研究提出对于连续梁桥各控制截面起主要作用的模态并不都一样.因此,结合不同模态,分析了连续梁桥各控制截面弯矩和位移冲击系数随阻尼比的变化情况,指出阻尼对冲击系数影响的大小与截面位置有关.

Based on simple vehicle model and simple continuous girder bridge model the vehicle-bridge interaction model is make. Under moving vehicle loads the histories of bending moment at different sections and mode curves of continuous girder bridge are given, The investigations show that the main mode are different for different section of continuous girder bridge fordifferent Therefore,according to the modes the moment impact and distance aimpact at different sections with damping radio are analysed,which reveals that the value of impact is releated with the position with the position of section for continuous girder bridge.