基于动柔度法的轨道高架桥橡胶垫减振性能研究

为探讨下橡胶垫对桥梁减振效果,基于动柔度法建立车辆-轨道-桥梁耦合的垂向动力学模型,车辆考虑1/8轮对系统,只考虑一系弹簧阻尼计算车轮动柔度,钢轨看作无限长Timoshenko梁,桥梁简化为简支的Euler梁,扣件系统、橡胶垫用线性弹簧阻尼单元模拟,联合车轮动柔度、钢轨动柔度和线性接触动柔度计算频域轮轨力并施加到钢轨上,计算钢轨、道床板、桥梁的动力响应。采用振动加速度级、加速度级插入损失和Z振级插入损失评价橡胶垫的减振效果,结果表明,采用橡胶垫后钢轨振动响应略有增大,Z振级插入损失为–0.81 d B,道床板振动响应大幅增加,Z振级插入损失为–10.3 d B,桥梁的振动响应减小明显,Z振级插入损失为:15.6 d B,计算结果表明橡胶垫能有效的降低桥梁结构振动,相关的研究为桥梁的减振降噪提供了一定参考。

Study on Vibration Reduction Performance of Rubber Pads of Track Viaducts based on Dynamic Compliance Method

In order to study the vibration effect of rubber mortar under cement asphalt mortar, the vertical dynamic model of vehicle-track-bridge coupling is established based on dynamic compliance method. The vehicle considers 1/8 rounds of the system, and only considers primary suspension. And the rails are regarded as infinitely long Timoshenko beams, the bridge is simplified as simply supported Euler beam, fastener system, Cement asphalt mortar, rubber pad with linear spring damping unit simulation, combined wheel dynamic compliance, rail dynamic flexibility and linear contact soft calculate the frequency of the track and field force and apply to the rail, calculate the rail, track plate, bridge dynamic response. The vibration response of the rubber pad was evaluated by the vibration acceleration level, the acceleration level insertion loss and the Z-level insertion loss. The results showed that the vibration response of the steel belt was slightly increased after the rubber pad was used, the insertion loss of the Z-stage was -0.81 dB, the vibration response of the bridge is reduced to -10.3 dB, the vibration response of the bridge is reduced obviously, and the insertion loss of the Z stage is 15.6 dB. The calculation results show that the rubber pad can effectively reduce the vibration of the bridge structure. The relevant research provides a reference for vibration reduction and noise reduction of bridges.