兰州杨家湾吊桥静载试验中的挠度检测研究

Study on Deflection Detection in Static Load Test of Yangjiawan Suspension Bridge in Lanzhou

桥梁静载试验是评价桥梁质量和验证桥梁承载能力是否满足设计要求的重要手段,而挠度测量是桥梁检测的重要组成部分。现以兰州市杨家湾吊桥静载试验检测的实际案例为依托,阐述了静载试验中位移观测点的布设、施测方法、试验荷载设计原理。通过对实验数据、挠度曲线、位移变化分析,结果表明:在试验荷载作用下变形无异常,经维修加固后承载能力满足设计荷载通过的使用要求,桥面更加平顺,上下游对称性较好。

The static load test of bridge is an important method to evaluate the quality of the bridge and to verify whether or not the bearing capacity of the bridge meets the design requirement. And the deflectionmeasurement is an important part of bridge detection. Based on the practical case of static load test detection of Yangjiawan Suspension Bridge in Lanzhou, this paper sets forth the layout and measurement method of displacement observation point, and test load design principles in the static load test. By the analysis of experimental data, deflection curve and displacement change, the results show that the bridge deformation is normal in the test load and the bearing capacity can meet the service requirements of the design load after maintenance and reinforcement. And the bridge deck is smoother, and the upstream and downstream symmetries are better.