高烈度区大跨斜拉桥横向约束方案优化分析

发布时间：2018-03-20 14:45

  本文选题：斜拉桥　切入点：非线性时程分析方法　出处：《公路工程》2017年01期 　论文类型：期刊论文

【摘要】：为了确定强震作用下斜拉桥的合理横向抗震约束体系,以可克达拉大桥为工程背景,采用非线性时程分析法,分析了4种横向约束体系即横向滑动体系、全限位体系、位移相关型减震体系和速度相关型减震体系对强震区大跨度桥梁地震响应的影响,重点对钢阻尼器的屈服荷载和黏滞阻尼器的位置及相关参数进行优化分析,并与其他体系的地震响应进行了对比。结果表明:在强震作用下,对于大跨度桥梁,横向滑动体系和全限位体系均不是理想的抗震体系;而在墩、梁之间设置减隔震装置可以显著减少横桥向的墩梁相对位移及地震剪力和弯矩;桥塔底的地震剪力和弯矩对减震装置参数的变化不敏感。
[Abstract]:In order to determine the reasonable transverse seismic restraint system of cable-stayed bridge under strong earthquake, taking the Cockdara Bridge as the engineering background and using nonlinear time-history analysis, four kinds of transverse restraint systems, namely, transverse sliding system and full limit system, are analyzed. The effect of displacement-dependent damping system and velocity-dependent damping system on seismic response of long-span bridges in strong earthquake region is studied. The yield load of steel damper and the position and relative parameters of viscous damper are optimized and analyzed. The results show that the lateral sliding system and the full-limited system are not ideal seismic systems for long-span bridges under strong earthquake, but in the pier, the seismic response of the system is compared with that of the other systems, and the results show that, under the strong earthquake, the lateral sliding system and the full-limited system are not ideal seismic systems. The relative displacement, seismic shear force and bending moment of the pier beam in the transverse direction of the bridge can be significantly reduced by setting the isolation device between the beams, and the seismic shear force and the bending moment at the bottom of the bridge tower are not sensitive to the variation of the parameters of the shock absorber.
【作者单位】： 西安建筑科技大学结构工程与抗震教育部重点实验室;交通部公路科学研究院;
【基金】：交通运输部西部交通建设科技项目(20113187721260) 可克达拉抗震性能研究(2013378)
【分类号】：U448.27
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本文编号：1639561