简支梁在列车荷载下的共振与消振效应

发布时间：2018-04-02 11:26

本文选题：简支梁桥　切入点：移动荷载　出处：《振动工程学报》2014年02期

【摘要】：对简支梁在移动荷载(单个移动力、等间距移动荷载列及列车荷载)下的振动进行了分析,得到了以桥梁自由振动方式表达的响应理论解。通过振动响应分析,得出了任一模态下简支梁共振及两类消振效应的发生条件,并阐明了它们的发生机理。第一类消振只与单个荷载的移动速度有关,第二类消振发生在两个荷载之间,并与它们的间距相关。当共振与消振条件同时满足时,共振将受到抑制,出现共振消失现象。用数值分析计算了一座19.1m简支梁桥在高速列车通过时的动力响应,并从单个轮对所引起的桥梁位移时程出发进一步说明了共振与消振机理和此时桥梁的响应特点,对解析结果进行了验证。
[Abstract]:The vibration of simply supported beam under moving load (single moving force, moving load sequence of equal distance and train load) is analyzed, and the theoretical solution of the response expressed in the form of free vibration of bridge is obtained. The occurrence conditions of simply supported beam resonance and two kinds of damping effects in any mode are obtained, and the mechanism of their occurrence is explained. The first type of vibration suppression is only related to the moving speed of a single load, and the second type of vibration suppression occurs between two loads. The resonance will be restrained and the resonance will disappear when the resonance and vibration suppression conditions are satisfied. The dynamic response of a 19.1m simply supported beam bridge is calculated by numerical analysis. The mechanism of resonance and vibration attenuation and the response characteristics of the bridge are further explained from the displacement time history of the bridge caused by single wheelset, and the analytical results are verified.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家重点基础研究发展计划973项目(2013CB036203) 中央高校基本科研业务费专项资金资助项目(C12JB00250)
【分类号】：U441.3

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