双柱墩抗震性能及墩顶位移影响因素分析

发布时间：2018-01-10 15:02

本文关键词：双柱墩抗震性能及墩顶位移影响因素分析　出处：《公路工程》2017年04期 　论文类型：期刊论文

【摘要】：针对典型钢筋混凝土双柱墩,采用逐步增量动力分析方法对双柱墩进行地震响应分析,对比研究常规双柱墩在有无系梁、不同轴压比、墩高、配箍率条件下,墩顶横向位移的变化规律。获得了轻微破损极限状态、损伤控制极限状态、倒塌控制极限状态这3种性能界限下的墩顶位移和位移角数据。结果表明:与无系梁墩相比,有系梁双柱墩各性能状态极限位移略小,但其受力更为均衡,可承受的加速度峰值更大;随着轴压比的增加,双柱墩墩顶位移呈线性减小趋势;当墩高较小时(5 m),双柱墩为剪切破坏形式,极限位移较弯剪破坏的墩柱小,当墩高超过20 m时,墩高对位移角的影响较大;配箍率对双柱墩墩顶位移的影响很小。
[Abstract]:For typical reinforced concrete double-column piers, the seismic response of double-column piers is analyzed by stepwise incremental dynamic analysis, and the conventional double-column piers are studied under the condition of having or not tie beams, different axial compression ratios, high piers and hoop ratio. The limit state of slight damage and the limit state of damage control are obtained. The data of top displacement and displacement angle of pier under the limit state of collapse control are obtained. The results show that the limit displacement of double-column pier with beams is slightly smaller than that of unbound beam pier, but the force is more balanced. More tolerable peak acceleration; With the increase of axial compression ratio, the displacement of the top of double column pier decreases linearly. When the height of the pier is less than 5 m, the double column pier is shearing failure, and the limit displacement is smaller than that of the pier damaged by bending shear. When the height of the pier is more than 20 m, the height of the pier has a great influence on the displacement angle. The effect of hoop ratio on the displacement of double column pier is very small.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178220) 江苏省交通运输科技项目(2013Y12) 江苏省科技支撑计划(BE2014716)
【分类号】：U442.55
【正文快照】： 0前言我国是一个多地震的国家,倘若桥梁工程遭到严重破坏,就会切断震区的交通生命线,造成救灾工作困难,加重次生灾害。因此,桥梁的抗震防灾工作显得极为重要。对桥梁进行动力弹塑性分析,通过延性设计将墩顶位移控制在墩柱强度急剧退化前是避免墩柱坍塌的关键[1]。双柱墩在我国

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