模态分离法在拱桥动载试验中的应用

Using of Modal Separation Method in Dynamic Loading Test

丹东月亮岛拱桥为一座钢管混凝土系杆拱,因为拱肋较高,在上面布设测点困难,只对主梁进行了夜间天然脉动测试,而后结合有限元动力特性理论计算数据,应用模态分离法依然获得了大桥的实际动力特性。本文介绍方法可为同类情况下的实桥测试提供参考,获得的大桥频率、振型和冲击系数等动力特性,可以为大桥通车和运营提供依据。

Through a dynamic loading test on an actual 202m arch bridge in Dandong,the dynamic amplification factor (DAF) is acquired to check the dynamic load capacity.The DAF is measured by forced vibration tests.It is difficult to fit test sensor because the rib is too high.So,only main beam test is arranged.The test method is seismic pulse response.The theoretical analysis about the bridge is also preceded.Through FEA software ANSYS,the 3-dimension special model is built and dynamic performance are acquired.So,the result can offer reference for same type bridges under similar circumstance.