RPC箱型墩柱塑性铰长度研究

发布时间：2018-03-01 06:12

本文关键词： RPC箱型墩柱塑性铰长度 OPENSEES 二次开发延性分析模型　出处：《铁道学报》2017年05期 　论文类型：期刊论文

【摘要】：为探讨RPC箱型墩柱塑性铰长度,基于构建的滞回本构模型,运用OPENSEES二次开发平台嵌入RPC材料,结合Steel02材料、非线性梁柱单元和零长度单元,建立考虑墩底纵筋滑移的延性分析模型。通过与3个常轴力作用下RPC箱型桥墩拟静力试验结果对比,验证模型的有效性。在此基础上,探讨水平加载角、轴压比、纵筋直径和墩高等关键因素对RPC箱型墩柱塑性铰长度的影响,提出结合试验研究和数值回归分析的塑性铰长度计算公式,并与规范常用的经验公式进行对比。结果表明,RPC箱型墩柱塑性铰长度随轴压比的增大逐渐减少,随墩高的增加逐渐增大,随纵筋直径和水平方向角的增加表现出先增大后减少的趋势,按Telemachos公式计算结果偏于不安全,按Priestley公式和桥梁抗震规范建议公式计算结果偏于保守,基于试验结果和数值分析提出的回归公式能较好地吻合数值结果并限制过大的塑性铰长度。
[Abstract]:In order to study the plastic hinge length of RPC box pier column, based on the hysteretic constitutive model, the RPC material is embedded in the OPENSEES secondary development platform, combined with Steel02 material, nonlinear Liang Zhu element and zero length element. A ductility analysis model considering slippage of longitudinal reinforcement at the bottom of pier is established. The validity of the model is verified by comparing the results of pseudostatic test of RPC box pier under three constant axial forces. On this basis, the horizontal loading angle and axial compression ratio are discussed. The influence of the key factors, such as longitudinal reinforcement diameter and pier height, on the length of plastic hinge of RPC box pier column is presented. A formula for calculating the length of plastic hinge is put forward, which is combined with experimental research and numerical regression analysis. The results show that the length of plastic hinge decreases with the increase of axial compression ratio and increases with the increase of pier height. With the increase of longitudinal reinforcement diameter and horizontal direction angle, the calculation results show a tendency of first increasing and then decreasing. The calculation results based on Telemachos formula tend to be unsafe, and those calculated by Priestley formula and suggested formula of bridge seismic code are conservative. The regression formula based on the experimental results and the numerical analysis can agree well with the numerical results and limit the length of plastic hinge.
【作者单位】：华东交通大学土木建筑学院;湖南大学土木工程学院;江西省高速公路投资集团公司上高管理中心;
【基金】：国家自然科学基金(51478183) 江西省交通运输厅科技项目(2016C0008)
【分类号】：U443.22

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