既有简支钢箱梁人行天桥的动力状态评估

Dynamic Evaluation of Existing Simple-supported Steel-box Pedestrian Overpass

基于动力测试的桥梁结构承载力评定方法是工程领域的研究热点。该文以上海市某既有人行天桥评估为背景,依据新颁布《公路桥梁承载能力检测评定规程》,给出了结合表观技术状况检测和动力测试分析的既有人行天桥性能评估方法。通过空间有限元理论分析和实测比较,评估了人行天桥在桥下车流、附近地铁施工和通行人流等环境激励下的动力特性。结果表明:该桥目前的技术状态为2级,需要进行外观维修;桥梁的动力特性符合规范规定,人行舒适性较好。

The bearing capacity evaluation method of bridge structure based on the dynamic test is the study hotspot of the engineering field.According to the evaluation of an existing pedestrian overpass and based on the newly issued Bearing Capacity Inspection Testing Assessment Regulations of Highway Bridge,this paper presents the performance evaluation method of the existing pedestrian overpass combined with the apparent technical inspection and the dynamic testing analysis.According to the spatial finite element theoretical analysis and the practical test comparison,the paper evaluates the dynamic characteristics because of the environmental incentives of the vehicle flow under the pedestrian overpass,the nearby subway construction and the pedestrian flow.The result shows that the present technical state of the bridge is Grade 2 and is required to implement the appearance maintenance.The dynamic characteristics of the bridge satisfy the specifications.And the comfortable feeling of the pedestrians is better.