预制大箱梁桥静载试验中分布式光纤传感技术的应用

Application of Distributed Optical Fiber Sensing Technology in Static Load Test of Precast Large Box Girder Bridge

摘要: 以杭州湾跨海大桥杭甬高速连接线公路工程为背景，介绍了主线28联跨径预制大箱梁桥荷载试验中应变光缆和数码应变传感器的测点布置，在静载工况下测量得到桥梁的整体应变分布情况和跨中截面的应变值，并对待测桥梁进行理论建模分析，对比理论结果和实测值。研究表明分布式光纤传感技术测试数据不仅与应变计实际测量相吻合，还能得到梁底连续应变分布，表面分布式光纤传感技术在桥梁检测中具有较高的应用价值。

Abstract: Taking the Hangzhou Bay Cross-Sea Bridge Hangzhou-Ningbo Expressway connecting line highway project as the background, the measuring point arrangement of strain cable and digital strain sensor in the load test of the main line 28-span prefabricated large box girder bridge is introduced, which is measured under static load conditions. The strain distribution of the whole bridge and the strain value of the mid-span section are measured under the static load condition, and the theoretical modeling analysis of the bridge is tested, comparing the theoretical results with the measured values. The research shows that the distributed optical fiber sensing technology test data is not only consistent with the actual measurement of the strain gauge, but also the continuous strain distribution of the beam bottom. The surface distributed optical fiber sensing technology has high application value in bridge detection.