汽车荷载作用下军用梁铺盖体系冲击系数分析

Analysis of Impact Coefficient of Military Beam Overlay System Under Vehicle Load

以西安地铁6号线钟楼站为例,研究汽车荷载对半盖挖法中临时铺盖体系的影响,主要分析20m六四式军用梁在行车荷载下的自振频率和冲击系数。采用DASP采集仪对现场临时铺盖体系进行动态测试,得到其自振频率和冲击系数,并与现行使用规范进行对比。结果表明,为保证军用梁临时铺盖体系的安全性和稳定性,应选取军用梁使用手册求出的冲击系数和公路桥涵规范根据桥梁基频求出的冲击系数较大值作为稳定性分析的冲击系数指标。

Taking the Zhonglou Station of Xi’an Metro Line 6 as an example, the impact of vehicle load on the temporary overlay system in the half-cover method is studied, and the natural frequency and impact coefficient of a 20 m 64-type military beam under vehicle load are analyzed. Adopting the DASP acquisition instrument to dynamically test the on-site temporary overlay system, and its natural frequency and impact coefficient are obtained, and compared with the current use specifications.The results show that in order to ensure the safety and stability of the military beam temporary overlay system, the larger value of the impact coefficient obtained from the military beam manual and the impact coefficient obtained from the highway bridge and culvert code according to the bridge fundamental frequency should be selected as the impact coefficient indicator of the stability analysis.