【摘要】 为准确模拟钢筋混凝土梁柱构件的滞回性能,对《混凝土结构设计规范》(GB 50010—2010)附录C混凝土本构模型进行了补充修正。采用原点指向模型与拉区应力-应变曲线随受压残余应变点迁移法,补充完善了混凝土受拉加卸载、拉压受力状态转换的滞回规则;采用基于体积配箍率建立的约束指标λt分析了钢筋混凝土梁柱构件中箍筋对混凝土的约束作用;对《混凝土结构设计规范》(GB 50010—2010)混凝土本构模型中的附加应变算法进行了修正,使得受压混凝土卸载/再加载变形模量能够反映循环加载下混凝土的受压损伤不可恢复特性。利用ABAQUS用户子程序接口UMAT,VUMAT进行二次开发,编写了适用于显、隐式动力分析的梁单元混凝土本构模型子程序,并对往复荷载下钢筋混凝土柱受力性能进行了模拟分析。结果表明:模型的数值模拟结果与拟静力试验结果吻合良好;构建的混凝土本构模型能够用于混凝土梁柱构件在复杂受力状态下的非线性性能分析。更多还原

【Abstract】 In order to accurately simulate the hysteresis behavior of reinforced concrete(RC)column-beam member,the concrete constitutive relations in Code for design of concrete structures(GB 50010—2010)was supplemented and amended.By using the origin-oriented-model and tensile stress-strain curve shifted with the residual strain of compression,the hysteretic rules for tension loading and unloading as well as reversal between tension and compression were supplemented.The confinement parameterλt based on volume stirrup ratio,the confinement effects of the stirrup were considered in the compression envelop.The arithmetic of additional strain in the concrete constitutive relation in Code for design of concrete structures(GB 50010—2010)was also modified,so that the loading and unloading modulus of compression could reflect the unrecoverable characteristic of compression damage of concrete with cyclic loading.The UMAT and VUMAT concrete user subroutines in software ABAQUS were developed respectively,and attached to the implicit and explicit dynamic analyses of concrete constitutive model of beam element.The hysteretic performance of RC columns under cyclic loading was numerically simulated.The results show that the numerical simulation results of the model are in good agreement with the experimental results of the pseudo-static tests.The established modelcan meet the demand for analyzing the nonlinear performance of RC column-beam element under the multi-axial loading conditions.更多还原