钢桁梁悬索桥承载能力的静载试验评估分析

Evaluation on Bearing Capacity of Suspension Bridge with Steel Truss Girder Based on Static Load Test

早期修建的小跨径钢桁梁悬索桥目前多已接近设计年限,正确评估其承载能力是桥梁维修、加固和技术改造的基本依据,也是桥梁管理的重要内容。文中介绍了桥梁承载能力评估的静载试验方法,分析了中美两国桥梁评估规范的异同;同时结合泸定县城南大桥的实例,在计算分析现场检测资料和静载试验结果的基础上评估其承载能力状况,并提出了恢复承载能力的加固措施和建议。

Most of the small-span steel truss girder suspension bridges built in early time have been close to their design life.Correct evaluation of their bearing capacity is the basis for bridge maintenance,reinforcement and technological transformation as well as the key content in bridge management.This paper introduces the static load method for evaluation of bridge bearing capacity and analyzes the difference between Chinese and American evaluation specification of bridge.Combined with the example of South City Bridge in Luding county,this paper evaluates its bearing capacity based on site inspection data and static load test result and puts forward reinforcement measures and suggestions for recovery of bearing capacity.