南昌朝阳大桥静动载试验研究

Study of Static and Dynamic Load Tests of Chaoyang Bridge in Nanchang

南昌朝阳大桥为主跨5×150m的六塔七跨波形钢腹板PC箱梁斜拉桥。为判断成桥的实际承载力以及设计使用荷载下的工作性能,对该桥进行静载和动载试验。结合该桥的实际受荷情况确定试验方案,测试各静载工况下主梁应力和挠度、主塔偏位和索力增量,以及动载试验下桥梁结构的自振特性和行车激振特性。将实测静动载试验结果与理论计算结果对比分析,结果表明:该桥结构受力合理,具有足够的强度和刚度,实际承载能力和工作性能满足设计荷载安全运营要求。

Nanchang Chaoyang Bridge mainly across the 5×150 m six tower seven cross-shaped steel web PC box girder cable-stayed bridge.In order to determine the actual carrying capacity of the bridge and the design performance under the load,the bridge is subjected to static load and dynamic load test.According to the actual load condition of the bridge,the test scheme is determined to test the stress and deflection of the main girder under the static load conditions,the increment of the main tower and the increase of the cable force,and the vibration characteristics of the bridge structure under the dynamic load test and the driving excitation characteristic.The results show that the bridge structure is reasonable,with sufficient strength and stiffness,and the actual carrying capacity and working performance meet the requirements of safe operation of the design load.