基于应急检测的农村人行悬索桥洪灾后评估分析

Assessment Analysis of Rural Pedestrian Suspension Bridge Based on Emergency Inspection After Flood

及时开展洪灾后的桥梁检测评估是排查结构安全隐患和恢复路线畅通的前提.以洪灾后的农村人行悬索桥为对象,根据现场检测结果与结构构造,结合JTG/T H21-2011《公路桥梁技术状况评定标准》相关条文,基于分层综合法的逐层递进原则,通过调整评价部件、权重及部分构件标度后进行技术状况评估.结果表明该桥总体评估为5类,钢构件防护涂层劣化明显,洪水引起部分钢梁和桥面发生偏位,以及钢梁局部连接缺损,建议提高该桥防锈等级,修复异常变位及缺损构件后重新评价桥梁实际承载能力,今后应重视缆风索改善此类人行桥桥跨结构的抗水毁稳定性.

Prompt inspection and assessment of crossing bridges after flood are needed,which is the premise of check structural safety hazards and recovery of route patency.Giving an example of such suspension bridge,structural technical condition was assessed according to site inspection results and structural characteristics after adjusting evaluation component,weight and partial disease scale based on layer by layer progressive principle of hierarchical analysis,with referring to the criteria of JTG/T H21—2011Standards for Technical Condition Evaluation of Highway Bridges.The results show the technical level of background bridge is in fifth category,protective coating of steel members are obviously degraded,partial steel beam and deck are deviated induced by flood,and partial steel connections are defected,so treatment measures are suggested for improving rust protection level,reevaluating structural actual bearing capacity after repairing problematic members with anomalous dissymmetry and defect,and further importance should be attached to wind cables which can improve structural stability of such suspension bridges against water damage.