独柱大悬臂盖梁和双柱墩式高架桥动力性能对比研究

应用梁格法,以独柱大悬臂盖梁高架桥和双柱墩高架桥为例进行仿真分析,并结合荷载试验从自振频率、振幅和冲击系数三个方面对独柱大悬臂盖梁高架桥和双柱墩桥梁的动力特性进行对比分析。研究结果表明：独柱大悬臂盖梁桥梁发生横向振动时,会产生相应的扭转模态,双柱墩可明显增强桥梁的横向刚度;独柱大悬臂盖梁结构在一定程度上削弱了全桥的动力性能。

A Comparative Study of the Dynamic Behavior of Viaducts Respectively with Single-Column Cantilever Bent Cap and with Double-Column Piers

Viaducts respectively with the single-column cantilever bent cap and with conventional double-column piers are simulated and analyzed by the grillage analytic method in the paper,with the dynamic behavior of the viaducts compared and analyzed by means of load tests from the angles of the natural frequency,the amplitude of vibration and the impact coefficients.The results of our research show that the torsional vibration modal is associated with lateral vibration of the viaduct with the single-column cantilever bent cap,while the double-column pier can significantly enhance the lateral stiffness of the bridge.They also shows that the structure of the single-column and cantilever bent cap weakens the dynamic performance of the whole bridge to some extent.