移动力作用下考虑自由振动与阻尼影响的简支梁桥动力响应理论解  

Theoretical Solution for the Dynamic Response of Simple-supported Beam Bridge under Moving Load with Free Vibration and Damping Effect

作　　者：占陈文[1] 丁勇[1] 孔树清[1] 黄剑源[1] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2013年第2期73-77,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金(51208269);浙江省自然科学基金(Y1110548);浙江省重中之重学科开放基金(ZJ1109)

摘　　要：对于移动力作用下简支梁的振动,推导了考虑阻尼和自由振动影响的动力学方程用以研究简支梁桥在车辆荷载作用下的动态挠度响应,并通过动力学有限元方法验证了该理论解的可靠性.利用该理论解探讨了影响车辆荷载冲击系数的主要因素,包括车辆的速度、桥梁的自振频率、结构材料类型和阻尼等,所得结论可为桥梁结构的减振降噪提供参考.The dynamic equation goveming the vibration of the simple-supported beam under moving load is presented for the analysis of the transient deflection of bridge under vehicle load, in which the damp effect and free vibration are considered. The theoretical solution is validated by the dynamic finite element method. Using the proposed method, the parameters affecting the impact factor of vehicle load is discussed, such as the velocity of the vehicle, length of the bridge, construction material and damping. The results are informative in reducing the vibration and noise of bridge structure.

关 键 词：移动力 动力响应 冲击系数 桥梁结构 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]