地震-桥梁-汽车耦合作用下行车安全性研究

A Study on Running Safety of Vehicles under Earthquake-Bridge-Vehicles Coupled-Vibration

由于地震的突发性和不可预测性,行驶在桥梁上的车辆无法及时躲避。在常遇级别地震作用下,不仅桥梁结构的安全性及正常使用功能不应受影响,桥上的行车安全性也不应被忽视。基于此,本研究建立了一种求解地震-桥梁-汽车系统空间耦合振动问题的非线性分析模型,并开发了相应的分析程序,然后以一组连续梁桥为对象,对突发地震状况下车辆侧滑或侧倾可能性等行车安全性问题进行了分析研究。研究结果表明,地震作用下车桥间竖向作用力波动幅度放大,但随着路面粗糙度增加,放大效应减弱;当路面粗糙度过高时,车辆有侧滑和侧倾的风险。

Due to the accidentalness and unpredictability of earthquake,vehicles have no ways to avoid it while running on a bridge.Generally,most focuses are put on the safety and service function of a bridge subjected to earthquakes of frequent occurrence.However,running safety of vehicles should not be neglected.Therefore,a nonlinear analysis model is proposed of solving earthquake-bridge-vehicles coupled-vibration problems,and an analysis program is developed accordingly.Then,a study is conducted on the risk of side-slip and roll of vehicles running on several continuous bridges under moderate seismic load.According to the study,the variation of the vertical force between vehicle and bridge is amplified due to the seismic load,and this influence decreases while the road roughness increases.The risk of side-slip and roll of vehicles becomes huge on the condition of high road-roughness.