弹塑性索和黏滞阻尼器系统用于斜拉桥横向减震分析

发布时间：2019-05-23 11:42

【摘要】：旨在研究弹塑性索对与黏滞阻尼器组合减震系统用于大跨度斜拉桥横向抗震设计作用。依据Caltrans规范构建了弹塑性索对的非线性本构关系,基于永宁黄河大桥弹性索对与黏滞阻尼器组合减震系统设计,通过调增地震波幅值,使弹性索进入塑性状态并分析结构响应。研究结果表明:容许拉索进入塑性可以显著增加其变形能力,进而提高整个结构应对强震作用的能力;与塔梁固定的常规体系相比,引入弹塑性索与黏滞阻尼器组合体系可以大幅降低主塔塔底弯矩及主梁加速度响应;与理想弹性索对工况相比,采用弹塑性索对虽然会导致较大的主梁残余位移,但对于控制最大索力和改善主梁加速度响应效果明显,同时塔梁、墩梁最大相对位移和塔底弯矩基本不变。
[Abstract]:The purpose of this paper is to study the effect of elastic-plastic cable pair combined with viscous dampers on transverse seismic design of long-span cable-stayed bridges. According to Caltrans code, the nonlinear constitutive relation of elastic-plastic cable pair is constructed. Based on the design of elastic cable pair and viscous dampers combined damping system of Yongning Yellow River Bridge, the elastic cable is made into plastic state and the structural response is analyzed by increasing the amplitude of seismic wave. The results show that allowing cables to enter plasticity can significantly increase their deformation capacity, and then improve the ability of the whole structure to cope with strong earthquakes. Compared with the conventional system with fixed tower beam, the bending moment at the bottom of the main tower and the acceleration response of the main beam can be greatly reduced by introducing the composite system of elastic-plastic cable and viscous dampers. Compared with the ideal elastic cable pair, although the elastic-plastic cable pair will lead to a larger residual displacement of the main beam, it has obvious effect on controlling the maximum cable force and improving the acceleration response of the main beam, at the same time, the tower beam, The maximum relative displacement of pier beam and the bending moment at the bottom of the tower are basically unchanged.
【作者单位】：同济大学土木工程学院;
【基金】：973课题(2013CB036302) 国家自然科学基金(51378384)
【分类号】：U442.55;U448.27

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