多点激励简支梁桥车桥耦合振动响应

为研究多点激励下,简支梁桥跨中截面的动力响应,基于车辆动力学的相关原理,推导多车车辆动力学模型,采用模态综合法建立多车车桥耦合分析系统,并与相关文献算例结果进行对比分析,得出自编程序与文献算例结果相对误差在6％以内,验证方法的正确性;通过分析不同车辆间距和车辆数量通过桥梁时,结构跨中截面的动力响应变化.结果 表明:在一定车辆间距和车辆作用下,车辆振动与桥梁的能量耗散相抵消,结构动力响应达到极值,且在多点激励下,部分国家规范值相对偏小,建议在后续分析中加入多车激励响应的影响,相关研究成果可为公路桥梁多车车桥动力分析提供参考.

Research on the coupled vibration response of simply supported beam bridge under multi-point excitation

In order to study the dynamic response of the mid-span section of simply supported beam bridge under multi-point excitation,Based on the relevant principles of vehicle dynamics, the multi-vehicle dynamic model is deduced, the multi-vehicle vehicle-bridge coupling system is established by using the modal synthesis method, the results are compared and analyzed with the examples in the relevant literature. The relative error between the method and the maximum mid-span section in the examples in the literature is within 6%. Analysis of different vehicle spacing and vehicle number of Bridges, the analysis of cross section in the dynamic response, the results show that under certain vehicle spacing and vehicle, the vehicle and bridge vibration energy dissipation phase offset, to reach maximum dynamic response of structure under multiple vehicle action and, part of the national standard value is relatively small, suggest adding more car excitation response in the subsequent analysis, the results for highway Bridges car axle dynamic analysis to provide more guidance.