基于黏滞阻尼器的大跨钢桁组合梁桥抗震性能研究

Research on Seismic Performance of Large-span Steel Truss Composite Beam Bridge Based on Viscous Damper

文章以大跨钢混组合梁为背景,根据桥梁自振特性及场地效应,生成地震波,建立全桥有限元模型,运用非线性时程分析法,分析了黏滞阻尼器阻尼系数和速度指数对桥梁内力、位移的影响。研究结果表明,在大跨钢桁组合梁上设置纵向黏滞阻尼器可有效降低桥墩墩底截面的内力、位移,合理优化阻尼参数后可有效提升阳尼器位移和弯矩减震率。

Based on the background of large-span steel-concrete composite beam,according to the natural vibration characteristics and site effect of the bridge to generate seismic waves,the finite element model of the whole bridge is established,and the nonlinear time history analysis method is used to analyze the influence of the damping coefficient and velocity index of the viscous damper on the internal force and displacement of the bridge.The results show that setting longitudinal viscous damper on the large-span steel truss composite beam can effectively reduce the internal force and displacement of the bottom section of the bridge pier,and the reasonable optimization of damping parameters can effectively improve the damper displacement and the bending moment damping rate.