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在不中断交通情况下进行斜拉索更换施工时,行车效应的影响性与运营状态有较大差异,为了确定合理的交通限制措施,需要对重载车辆在不同车速下的桥跨结构反应进行分析。该文采用基于直接积分法的时程分析技术,以某换索斜拉桥为工程背景,分析了控制性载重车辆在不同车速下行车对桥跨结构的作用效应,指出在斜拉索卸除的情况下,行车时的冲击效应相比运营状态下有较明显增大,而行车引起的结构反应时程曲线的峰值并非随车速增大而增大;因此,施工控制中需要根据具体桥梁情况确定适用的冲击系数和限制车速。
In the case of cable stayed cable replacement without interruption of traffic conditions, the influence of traffic effect and operating status are quite different. In order to determine reasonable traffic restriction measures, the response of bridge-span structures of heavy-duty vehicles under different vehicle speeds needs to be carried out analysis. In this paper, the time-history analysis technique based on direct integral method is used in this paper. Taking a cable-stayed bridge as an example, the effect of driving on the bridge structure under different vehicle speeds is analyzed. , The impact effect when driving is more obvious than that under operating condition, and the peak value of structural reaction time-course curve caused by driving is not increased with the increase of vehicle speed. Therefore, the construction control needs to be based on the specific bridge conditions Determine the applicable impact factor and speed limit.