预应力混凝土空心墩拟静力试验与数值分析

发布时间：2018-05-02 19:51

本文选题：预应力混凝土结构 + 空心墩　；参考：《桥梁建设》2015年03期

【摘要】：为研究预应力混凝土空心墩的抗震性能,对4个空心墩模型进行拟静力试验研究,并基于试件的破坏特征、滞回性能等试验结果,利用OpenSees软件,采用纤维梁柱单元模拟各空心墩在拟静力荷载下的力学行为,对比分析预应力混凝土整体式空心墩、装配式空心墩与钢筋混凝土空心墩的拟静力行为。结果表明:在钢筋混凝土空心墩中配置竖向无粘结后张预应力筋,可提高其刚度与水平抗力,增强滞回曲线的捏缩效应,减小残余位移,对累积滞回耗能影响不大;与整体式空心墩不同,添加耗能钢筋的预应力装配式空心墩没有出现明显的塑性铰区,曲率分布和剪切错动主要集中在墩底接缝处,滞回曲线呈明显的捏缩状,损伤程度较轻,其刚度、累积滞回耗能分别约为钢筋混凝土空心墩的100%、73%;建议的模型和方法能较准确地预测预应力空心墩的拟静力行为。
[Abstract]:In order to study the seismic behavior of prestressed concrete hollow pier, the quasi-static test of four hollow pier models was carried out. Based on the test results of failure characteristics and hysteretic performance of the specimen, the software OpenSees was used to study the seismic behavior of prestressed concrete hollow pier. The mechanical behavior of hollow piers under quasi-static load was simulated by fiber Liang Zhu unit. The quasi-static behavior of prestressed concrete integral hollow pier, prefabricated hollow pier and reinforced concrete hollow pier was compared and analyzed. The results show that the vertical unbonded post-tensioned tendons in reinforced concrete hollow piers can improve the stiffness and horizontal resistance, enhance the pinch effect of hysteretic curves, reduce the residual displacement, and have little effect on cumulative hysteretic energy consumption. Different from integral hollow piers, there is no obvious plastic hinge area in prestressing fabricated hollow piers with energy dissipation bars. The curvature distribution and shear dislocation are mainly concentrated at the joints at the bottom of the piers, the hysteretic curves are obviously pinch, and the damage degree is light. The stiffness and cumulative hysteretic energy consumption of the hollow pier are about 100 and 73, respectively, and the proposed model and method can accurately predict the quasi-static behavior of the prestressed hollow pier.
【作者单位】：石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室;济南铁路局聊城工务段;同济大学桥梁工程系;
【基金】：国家自然科学基金项目(90815007) 河北省自然科学基金项目(E2011210028、E2015210038)~~
【分类号】：U443.22;U442.55

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