双塔斜拉大桥桥梁载荷试验与分析

Load Test and Analysis of Double Pylon Cable-stayed Bridge

通过对双塔斜拉大桥主桥进行静载试验可了解桥跨结构的静力特性,判断其能否继续安全正常运营。JN大桥主桥为双塔斜拉桥型,对主桥进行静载试验可获得了桥梁在不同荷载工况下的主梁静应力、挠度、塔顶水平变位、斜拉索拉力等参数。分析结果表明:在设计等效的试验荷载作用下,主桥竖向挠度和应变校验系数实测值均小于计算值,说明主梁各测试断面竖向强度和刚度满足设计要求。

The static characteristics of the bridge span structure can be understood through the static load test on the main bridge of the double pylon cable-stayed bridge to judge whether it can continue to operate safely and normally.The main bridge of JN bridge is a double pylon cable-stayed bridge.The static stress,deflection,horizontal displacement of pylon top,stay cable tension and other parameters of the main beam of bridge under different load conditions can be obtained through the static load test on the main bridge.The analysis results show that,under the design equivalent test load,the measured values of the vertical deflection and strain verification coefficients of the main bridge are smaller than the calculated values,indicating that the vertical strength and stiffness of each test section of the main beam meet the design requirements.