无伸缩缝桥梁的动力特性计算与试验研究

Dynamic analysis and field-test of jointless bridge

福建省永春县上坂大桥是目前我国修建桥长最大,采用整体式桥台的无伸缩缝桥梁。本文通过该桥的动力试验研究了该桥在天然脉动荷载作用下的自振特性,采用结构分析软件ANSYS建立全桥的空间模型,计算该桥的自振特性,与实测结果进行了分析比较。实桥试验还测试了无障碍行车试验和跳车试验这2种车辆激振作用下桥梁的强迫振动特性,并把实测的荷载冲击系数与新桥规的计算结果进行比较。研究结果有助于对该类桥梁动力特性的认识,有利于进一步开展无伸缩缝桥梁的抗震性能研究。

Shangban bridge is the most long integral abutment bridge in China. It is located in Yongchun county, Fujian province. In this paper, the test research on the characteristics of the natural vibration for the bridge is discussed. The authors calculate the characteristics of the natural vibration for the bridge with the structure analysis software-ANSYS, and compare them with the test results. The vibratory characteristics of the structure are also tested under a traveling truck and a truck with obstacle. The research results are helpful for the knowledge of dynamic characteristics of these bridges and help us to research the seismic properties of jointless bridge.