箱形弯梁桥车桥耦合振动分析

发布时间：2019-02-14 16:21

【摘要】：城镇化的快速发展,促进了城市交通工程的发展,曲线梁桥应用越来越广泛;随荷载载重提高和速度的增加,以及桥梁的轻型化,高墩桥梁的普遍应用,桥梁动力响应成为不能回避的研究课题。论文对城市曲线桥梁车桥耦合振动展开研究,具有一定的工程应用价值。对车辆动荷载作用下的桥梁动力响应问题进行了理论分析,并以某城市立交匝道弯梁桥为研究对象,进行数值模拟研究。将车-桥耦合系统分为车辆子系统和桥梁子系统,运用ANSYS分别建立了车辆和曲线箱梁桥的有限元模型。车辆采用6参数2自由度的1/4汽车模型,桥梁采用三维的实体单元建立有限元模型。具体分析了预应力、曲率半径、约束情况及车速等参数变化对弯梁桥自振特性和动力响应的影响。经过数值模拟分析得出各种参数的变化对弯梁桥的动力性能均有影响,主要结论如下:(1)预应力对弯梁桥的位移、速度及加速度响应均有影响,且随预应力增大而增强,各阶模态频率值均逐步减小;(2)弯梁桥的动力响应随半径的增加而波动剧烈,但当半径超过200m后,响应开始趋于稳定;(3)动力响应时程曲线将随着车速的不断增加,其波动情况不断趋于光滑和稳定。
[Abstract]:The rapid development of urbanization has promoted the development of urban traffic engineering, and the application of curved beam bridge is becoming more and more extensive; with the increase of load load and the increase of speed, as well as the light weight of the bridge and the universal application of the high-pier bridge, the dynamic response of the bridge becomes a research subject that can't be avoided. The research on the coupling vibration of the bridge axle of the urban curve has a certain application value. The theoretical analysis of the dynamic response of the bridge under the action of dynamic load of the vehicle is carried out. The vehicle-bridge coupling system is divided into the vehicle subsystem and the bridge subsystem, and the finite element model of the vehicle and the curved box girder bridge is established by using the ANSYS. The vehicle adopts 1/ 4 automobile model with 6-parameter 2-degree-of-freedom, and the bridge adopts three-dimensional solid unit to set up the finite element model. The effects of parameters such as prestress, radius of curvature, restraint condition and vehicle speed on the self-vibration and dynamic response of the bridge are analyzed. The results of numerical simulation show that the variation of various parameters has an effect on the power performance of the curved beam bridge, and the main conclusions are as follows: (1) The displacement, velocity and acceleration response of the pre-stress to the curved beam bridge are affected, and the modal frequency values of each stage are gradually reduced with the increase of the prestress; (2) The dynamic response of the curved beam bridge is violent with the increase of the radius, but when the radius exceeds 200m, the response starts to be stable; and (3) the curve of the dynamic response will continue to be smooth and stable as the vehicle speed increases.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3

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