梁柱节点的单元模型校准与其组合体试验方法对比

发布时间：2018-11-12 18:51

【摘要】：梁柱节点是钢筋混凝土结构中受力性能复杂的重要部位,其有限元模型的合理性是结构非线性数值模拟成功实施的关键。在OpenSees结构分析平台上,以力学模型较为细化的梁柱节点单元(beam-column joint element)模型为研究对象,在合理确定梁柱节点单元各分量的参数取值方法的基础上,分别以多组钢筋混凝土梁柱组合体试件的梁端加载、柱端加载试验结果为依据,对有限元模拟结果的准确性进行校准,并在此基础上分析了同一组合体试件分别采用梁端加载、柱端加载两种试验方法时模拟结果的差别。结果表明:梁柱节点单元中模拟节点内纵筋滑移分量的材料模型存在较明显误差,当滑移较小时,模拟结果有相对较好的精度;当梁纵筋滑移量较大时,模拟的组合体整体滞回性能与试验结果相比误差较大;当梁、柱纵筋黏结滑移值较小时,同一组合体试件在梁端加载、柱端加载两种试验方法下的节点非弹性变形相近。
[Abstract]:Liang Zhu joint is an important part of reinforced concrete structure with complicated mechanical properties. The rationality of its finite element model is the key to the successful implementation of nonlinear numerical simulation. On the platform of OpenSees structure analysis, taking Liang Zhu node unit (beam-column joint element) model), which is more detailed in mechanics model, as the research object, and on the basis of reasonably determining the parameter value of each component of Liang Zhu node unit, Based on the beam end loading and column end loading test results of several groups of reinforced concrete Liang Zhu composite specimens, the accuracy of finite element simulation results is calibrated, and on this basis, the beam end loading of the same composite body specimen is analyzed. The difference of simulation results between the two test methods under column end loading. The results show that there are obvious errors in the material model of Liang Zhu node element to simulate the slip component of longitudinal tendons in the joints, and when the slippage is small, the simulation results have relatively good accuracy. When the slippage of longitudinal bars is large, the hysteresis performance of the simulated composite is larger than that of the experimental results. When the slippage value of longitudinal tendons of beam and column is small, the inelastic deformation of the joint is similar under the loading of the same composite specimen at the end of the beam and the two test methods of column end loading.
【作者单位】：重庆大学土木工程学院;山地城镇建设与新技术教育部重点实验室(重庆大学);深圳市华阳国际工程设计股份有限公司;
【基金】：国家自然科学基金项目(51178487,51478063)
【分类号】：TU375.4

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