基于封闭连通管的千米级悬索桥挠度测试

Deflection Test of a Suspension Bridge with Span Longer than One Thousand Meters Based on the Closed-end Connecting-pipe Method

在桥梁荷载试验中,挠度是关键的观测和评价指标,但对于超大跨径的跨江跨河桥梁,主梁挠度尤其是动挠度的观测还是一个难题。以虎门二桥项目大沙水道桥的荷载试验为例,介绍了基于封闭连通管的千米级悬索桥的挠度测试方法,以及与传统方法和其他方法的对比情况。结果表明,基于封闭连通管的挠度测试方法可满足千米级悬索桥的试验要求。

Deflection is a key observation and evaluation indicator in bridge load tests,however,for large span bridges,the deflection measurement of the main beam,especially the dynamic deflection,is still a difficult problem.In this paper,taking the deflection test of Dasha Waterway Suspension Bridge of the Second Humen Bridge Project as an example,the principles of closed-end connecting-pipe method have been introduced,with the results being compared with traditional methods.The results have shown that the deflection test method being based on the closed-end connecting-pipe method can fully meet the test requirements of the suspension bridge with span longer than one thousand meters.