鄂东长江公路大桥主桥静动载试验

鄂东长江公路大桥为半飘浮体系双塔混合梁斜拉桥,为评定该桥的性能及承载力,结合有限元法理论计算分析,对其主桥进行实桥静、动载试验。由静载试验测得主梁和桥塔的位移、应力及斜拉索的索力,通过实测值与计算值的比较,得出该桥主桥结构竖向整体刚度、承载力、桥塔结构整体纵向抗弯刚度、斜拉索索力均满足设计要求。通过由动载试验测得的桥梁结构自振特性、冲击系数与计算值的比较,可知该桥的颤振稳定性、振幅、冲击系数均满足规范要求,结构动力性能良好。

Static and Dynamic Load Tests for Main Bridge of Edong Changjiang River Highway Bridge

Edong Changjiang River Highway Bridge is a half floating system two-pylon composite girder cable-stayed bridge.To evaluate the performance and bearing capacity of the bridge,the finite element method was used to make theoretical calculation and analysis,the static load test and dynamic load test were also carried out for the main bridge.By the static load test,the displacement and stresses of the main girder and the pylons and the forces of the stay cables were obtained.The comparison of the measured values and the calculated values reveals that the longitudinal overall stiffness and the bearing capacity of the main bridge,the longitudinal overall flexural stiffness of the pylons and the forces of the stay cables all meet the design requirements.Furthermore,the comparison of the natural vibration characteristics of the bridge structure,impact coefficient measured in the dynamic load test and the calculated values indicate that the flutter stability,amplitude of vibration and impact coefficient all meet the code requirements,and the dynamic performance of the structure is good.