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大跨度桥梁属于柔性结构,采用消能减震技术可改善其动力特性,以新疆果子沟特大桥为例,研究大跨度桥梁的减震措施。新疆果子沟特大桥为三跨连续的钢桁梁斜拉桥,主跨长360 m,钢筋混凝土索塔高分别为209.5m和215.5 m。在初步设计阶段,采用漂浮体系进行分析,得到的纵向相对位移大于边墩支座的容许位移;随后提出的半漂浮体系的计算结果也不完全满足设计要求;因此,提出了在边墩和两个索塔上设置黏滞阻尼器的设计方案。本文主要研究黏滞阻尼器的位置布置和参数取值问题。在有限元仿真模型中,根据实际场地条件,考虑了桩—土—结构的动力相互作用。采用非线性时程分析法计算后发现,在顺桥向上设置黏滞阻尼器后,结构响应和控制点的相对位移下降显著。
The long-span bridge is a flexible structure, and the dynamic characteristics of the long-span bridge can be improved by adopting energy-dissipating and damping technology. Taking the Guozigou special bridge in Xinjiang as an example, the long-span bridge’s damping measures are studied. Guozigou Bridge is a three-span continuous steel truss cable-stayed bridge with a main span of 360 m and a reinforced concrete pylon of 209.5 m and 215.5 m respectively. In the preliminary design stage, the floating system was used for analysis, and the longitudinal relative displacement obtained was larger than the allowable displacement of the side pier support. The calculation results of the semi-floating system proposed later did not fully meet the design requirements. Therefore, A pylon set viscous damper design. In this paper, we mainly study the location and parameters of viscous dampers. In the finite element simulation model, considering the actual site conditions, the dynamic interaction of pile-soil-structure is considered. Using nonlinear time history analysis, it was found that the relative displacement of the structural response and the control point decreased significantly when viscous dampers were installed up the bridge.