运营状态下南京长江二桥拉索索力测试与分析

为准确获取运营状态下拉索索力,采用动测法对南京长江二桥进行了拉索索力测试,讨论了车辆荷载、阻尼器以及环境温度对索力测试的影响,并对运营状态下的索力测试结果进行了对比与分析.研究结果表明:相对于面外振动,拉索面内振动更容易受车辆荷载影响,利用面外振动可以较好的确定拉索的自振频率;阻尼器和温度对拉索自振频率影响较小.通过对比成桥状态的拉索索力测试值和本次索力测试值,可看出个别拉索索力变化较大,大部分拉索索力变化较小.

Measurement and analysis of cable tension in the second Nanjing Yangtze River Bridge under running condition

The vibration method was used to measure the cable tension of the second Nanjing Yangtze River Bridge under running condition.Some factors influencing on measurement are discussed,such as vehicle load,damper and temperature.The results show that the vehicle load has much more effects on in-plane vibration of the cable than on out-plane ones,and the cable modal frequencies can be better acquired by out-plane vibration signal.Some typical cables were measured in different conditions,including before and after removing the damper and different temperature.The results show that the damper and temperature have no significant effect on the cable modal frequencies.Compared with the ones tested in load experiment,most of the cables' tension change only a little,however a few cables' tension change greatly.