移动车辆作用对公路连续梁桥地震反应特性的影响

发布时间：2018-05-19 18:49

本文选题：公路连续梁桥 + 移动车辆　；参考：《振动工程学报》2017年05期

【摘要】：随着汽车保有量的增加,地震发生时车辆在桥上存在车辆作用的概率大大增加。为探讨移动车辆对公路连续梁桥地震反应特性的影响,以3×40 m的连续T梁桥和汽车—超20级车队为研究对象,根据车轮与桥面接触点的作用力和位移协调条件,首先给出了移动车辆作用下连续梁桥地震反应的分析方法,然后考虑车辆本身动力特性的影响,采用多自由度的车辆模型组合成车队荷载模型,并借助ANSYS的APDL参数化语言编制了相应的分析程序,利用该程序分析了中低强度三向地震动作用下移动车辆作用对连续梁桥地震反应的影响参数。分析结果表明:典型三向地震动作用下,移动车辆对不同地震波作用下的连续梁桥地震反应有明显的影响,其影响程度与车速、轮胎刚度以及桥梁墩高直接相关。随着桥面上横向加载车道数的增加,顺桥向的墩底弯矩及支座位移逐渐减小,而横桥向的墩底弯矩及支座位移则逐渐增大,但响应的变化率随车道数增加而逐渐减小。车辆对桥梁地震响应的影响随着车速的变化和车身重量的变化而改变,但路面不平度的改变对移动车辆作用下桥梁地震反应影响甚微。部分研究成果与前人的研究结论相一致,但有些成果仍有待更进一步的试验验证。
[Abstract]:With the increase of vehicle ownership, the probability of vehicle action on the bridge increases greatly when the earthquake occurs. In order to investigate the influence of moving vehicles on the seismic response characteristics of highway continuous beam bridges, a 3 脳 40 m continuous T-beam bridge and a vehicle-super 20 class motorcade are taken as the research objects, according to the coordination conditions of the force and displacement of the contact point between the wheels and the bridge deck. In this paper, the seismic response analysis method of continuous beam bridge under moving vehicle action is presented, and then considering the influence of vehicle dynamic characteristics, the vehicle model with multiple degrees of freedom is combined to form the vehicle fleet load model. With the help of the APDL parameterized language of ANSYS, the corresponding analysis program is compiled, and the influence parameters of moving vehicle action on the seismic response of continuous beam bridges under the action of low and medium intensity three direction ground motion are analyzed. The results show that the moving vehicle has a significant effect on the seismic response of continuous beam bridges under different seismic waves under the action of typical three-direction ground motion, and the influence degree is directly related to the speed, tire stiffness and the height of the bridge pier. With the increase of the number of lateral loading lanes on the bridge deck, the bending moment and support displacement of piers along the bridge direction gradually decrease, while the bending moment and support displacement of the transverse bridge increase gradually, but the change rate of response decreases with the increase of the number of lanes. The influence of vehicle on bridge seismic response changes with the change of vehicle speed and body weight, but the change of road roughness has little effect on bridge seismic response under the action of moving vehicle. Some of the research results are consistent with the previous conclusions, but some of the results still need to be verified by further experiments.
【作者单位】：福州大学可持续与创新桥梁工程研究中心;福建省招标采购集团有限公司;
【基金】：国家自然科学基金资助项目(51108086)
【分类号】：U442.55;U448.215

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