地震作用下车—桥空间耦合系统动力响应分析
发布时间：2018-10-16 10:43
【摘要】：地震是一种严重的自然灾害,对于铁路系统而言,地震可能会引起轨道弯曲、车辆脱轨、桥梁坍塌等一系列问题。随着高速铁路的发展,桥梁在铁路线路中所占的比例不断增大,地震发生时车辆运行在桥梁上的概率也随之变大。为了探究地震对车辆和桥梁的影响,建立了车辆-桥梁空间耦合系统动力学分析模型,其中车辆模拟为多刚体系统,采用达朗贝尔原理推导车辆系统动力学方程;桥梁假定为质量均匀分布的等截面简支梁,采用模态坐标法建立桥梁广义坐标方程。将规格化的地震波作为系统激励,同时考虑轨道随机不平顺的影响,采用新型显式积分法求解系统方程,分析不同烈度地震作用下车桥耦合系统的动力响应。结果表明,地震作用车辆-桥梁空间耦合系统的响应有着显著的影响。当地震烈度在桥梁的抗震设防烈度范围内时,桥梁垂向加速度、横向加速度、垂向挠度和横向挠度均满足规范的限值要求。车辆运行平稳性的Sperling指标相对加速度指标较为宽松,当地震烈度为7度及以上时,车辆已不能平稳地运行于桥梁之上。车辆的脱轨系数随着行驶速度的增加急剧增大,当地震发生时,需要采取制动措施避免安全事故的发生。轨道随机不平顺对车辆动力响应的影响不明显,对桥梁垂向加速度响应影响相对明显。在相对较弱的地震作用下,如需详细研究桥梁的动力响应,则不应该忽略轨道随机不平顺的影响。随着地震烈度的增大,轨道随机不平顺的影响越来越小。
[Abstract]:Earthquake is a serious natural disaster, for railway system, earthquake may cause a series of problems, such as track bending, vehicle derailment, bridge collapse and so on. With the development of high-speed railway, the proportion of bridges in railway lines is increasing, and the probability of vehicles running on bridges becomes larger when earthquake occurs. In order to investigate the effect of earthquake on vehicle and bridge, the dynamic analysis model of vehicle-bridge spatial coupling system is established. The vehicle simulation is a multi-rigid body system, and the dynamic equation of vehicle system is derived by using the Darembert principle. The bridge is assumed to be a simple supported beam with uniform mass distribution. The generalized coordinate equation of the bridge is established by using the modal coordinate method. Taking the normalized seismic wave as the system excitation and considering the influence of track random irregularity, a new explicit integral method is used to solve the system equation, and the dynamic response of the vehicle-bridge coupling system under different intensity earthquakes is analyzed. The results show that the seismic response of vehicle-bridge spatial coupling system is significant. When the seismic intensity is within the range of seismic fortification intensity of the bridge, the vertical acceleration, transverse acceleration, vertical deflection and transverse deflection of the bridge all meet the limit requirements of the code. The Sperling index of vehicle running stability is relatively loose relative to acceleration index. When the seismic intensity is 7 degrees or above, the vehicle can no longer run smoothly on the bridge. The derailment coefficient of the vehicle increases sharply with the increase of the driving speed. When the earthquake occurs, the braking measures should be taken to avoid the occurrence of the safety accident. The influence of track random irregularity on vehicle dynamic response is not obvious, but on the vertical acceleration response of bridge is relatively obvious. If the dynamic response of the bridge needs to be studied in detail under the relatively weak earthquake, the influence of track random irregularity should not be ignored. With the increase of seismic intensity, the influence of track random irregularity becomes smaller and smaller.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U211.9
[Abstract]:Earthquake is a serious natural disaster, for railway system, earthquake may cause a series of problems, such as track bending, vehicle derailment, bridge collapse and so on. With the development of high-speed railway, the proportion of bridges in railway lines is increasing, and the probability of vehicles running on bridges becomes larger when earthquake occurs. In order to investigate the effect of earthquake on vehicle and bridge, the dynamic analysis model of vehicle-bridge spatial coupling system is established. The vehicle simulation is a multi-rigid body system, and the dynamic equation of vehicle system is derived by using the Darembert principle. The bridge is assumed to be a simple supported beam with uniform mass distribution. The generalized coordinate equation of the bridge is established by using the modal coordinate method. Taking the normalized seismic wave as the system excitation and considering the influence of track random irregularity, a new explicit integral method is used to solve the system equation, and the dynamic response of the vehicle-bridge coupling system under different intensity earthquakes is analyzed. The results show that the seismic response of vehicle-bridge spatial coupling system is significant. When the seismic intensity is within the range of seismic fortification intensity of the bridge, the vertical acceleration, transverse acceleration, vertical deflection and transverse deflection of the bridge all meet the limit requirements of the code. The Sperling index of vehicle running stability is relatively loose relative to acceleration index. When the seismic intensity is 7 degrees or above, the vehicle can no longer run smoothly on the bridge. The derailment coefficient of the vehicle increases sharply with the increase of the driving speed. When the earthquake occurs, the braking measures should be taken to avoid the occurrence of the safety accident. The influence of track random irregularity on vehicle dynamic response is not obvious, but on the vertical acceleration response of bridge is relatively obvious. If the dynamic response of the bridge needs to be studied in detail under the relatively weak earthquake, the influence of track random irregularity should not be ignored. With the increase of seismic intensity, the influence of track random irregularity becomes smaller and smaller.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U211.9
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