某人行吊桥既有承载能力验算及荷载试验方案设计

Scheme Design for Check Calculation on Existing Bearing Capacity and Load Test of a Pedestrian Suspension Bridge

人行吊桥荷载试验目前尚缺少相关技术规程,结合某人行吊桥的荷载试验实践,详细介绍了其既有承载能力验算及荷载试验方案设计过程。在恒载及设计人行荷载作用下,该桥承载索安全系数为8.2,大于下限值3;单根承载索最大拉力为39441N,远小于容许拉力110400N;最不利荷载作用下挠度系数变化值为1/163,小于常值1/150;说明该桥既有状态承载能力满足要求。荷载试验方案加载简便、测点布置合理,加载过程观测方便,可供相关工程技术人员参考。

At present,the load test of pedestrian suspension bridge lacks relevant technical regulations. In combination with load test practice of a pedestrian suspension bridge,the procedure of scheme design for check calculation on existing bearing capacity and load test is introduced in detail. Under the effects of constant load and designed pedestrian load,the safety coefficient of the bearing cable of the bridge is 8. 2,more than the lower limit value 3; the maximum tension of single bearing cable is 39441 N,far less than allowable tension 110400N; the change value of deflection coefficient under the effect of the most unfavorable bearing capacity is 1 /163,less than normal value 1 /150. The results show that the bearing capacity of the bridge under the existing status can meet the requirement. The application of load in the load test scheme is simple,the monitoring point arrangement is reasonable,and the observation of loading procedure is convenient, thus providing reference for relevant engineering technical personnel.