为合理分析和计算波形钢腹板PC简支箱梁桥局部与整体的动力冲击系数,分别建立了波形钢腹板PC箱梁桥和车辆结构的振动方程,并根据车轮与桥而的接触关系形成两者耦合振动的动力方程.采用MATLAB和ANSYS软件分别建立了三维的车辆模型和波形钢腹板PC箱梁桥的有限元模型,并在考虑路面平整度随机激励的作用下,利用M ATIAB软件求解了车桥耦合系统的动力方程,得到桥梁结点的位移振动响应;依据动位移与静位移的关系,计算出了波形钢腹板PC箱梁桥的局部及整体的动力冲击系数;对所求得的局部及整体动力冲击系数进行了不同车辆类型、不同车道数加载,不同行驶速度和不同路面情况下的参数分析,并与我国现行规范和美国现行AASHTO规范进行对比分析,最终提出了波形钢腹板PC简支箱梁桥局部及整体动力冲击系数的合理确定方法,所得结论可为波形钢腹板PC箱梁桥动力冲击系数的确定提供参考.%In order to calculate and analyze the local and global impact factors (IMs) of a simply supported box girder bridge with corrugated steel webs (CSWs) accurately,the motion equations of the bridge and vehicle were established.The two system equations were coupled through the contact condition.Three dimensional vehicle models were established by using the MATLAB software and the finite element model of the PC box girder bridge with CSWs was established by using the ANSYS software,respectively.Considering the random excitation effects of the road roughness,the vibration responses of the bridge nodes could be obtained by using the MATLAB program to solve the dynamic equations of the vchicle-bridge system.According to the relationship between the dynamic and the static deflection,the local and global IMs of the PC box girder bridge with CSWs could be calculated.The obtained local and global IMs were compared and the relationship between the obtained IM and four important parameters,including the type of vehicle,the number of the loaded lanes,vehicle speed,and the road surface condition,was studied.The obtained local and global IMs were also compared with the China code JTG D60-2015 and the AASHTO standard specification.Finally,the reasonable determinatiou method to calculate the local and global dynamic IMs of a simple supported PC box girder bridge with CSWs was presented.The conclusions can provide a reference for determining IMs of this type of bridges.
展开▼
