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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。
The beam-column joint is an important part of the reinforced concrete structure with complex mechanical properties. The rationality of its finite element model is the key to the successful implementation of nonlinear numerical simulation of the structure. On the platform of OpenSees structural analysis, taking the beam-column joint element model with more detailed mechanical model as the research object, on the basis of reasonable parameter determination of each component of beam-column node element, Based on the results of beam loading and column loading, the accuracy of finite element simulation results was calibrated. Based on the analysis results, the test results of beam group Loading, column loading two test methods when the difference between the simulation results. The results show that the material model of the longitudinal rib slip component in the node of beam-column joint has obvious errors. When the slip is small, the simulation result has a relatively good accuracy. When the beam longitudinal displacement is large, The overall hysteretic behavior of the simulated composite is more error than the experimental results. When the bond-slip value of the longitudinal reinforcement of beams and columns is small, the specimens of the same assembly are loaded on the beam end and the two ends of the column under the two experimental methods Nearly inelastic deformation.