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基于“梁柱纤维-节点核心区”组合模型的钢筋混凝土框架节点滞回性能数值模拟

NUMERICAL SIMULATION ON HYSTERETIC BEHAVIORS OF REINFORCED CONCRETE FRAME JOINT BASED ON BEAM COLUMN FIBER-JOINT CORE AREA COMBINATION ELEMENT

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【作者】 袁智杰孙广俊蒋雯李鸿晶

【Author】 YUAN Zhijie;SUN Guangjun;JIANG Wen;LI Hongjing;College of Civil Engineering, Nanjing Tech University;Jiangsu Huadong Construction Foundation Engineering Co., Ltd.;

【机构】 南京工业大学土木工程学院江苏华东建设基础工程有限公司

【摘要】 对钢筋混凝土梁-柱节点的非线性滞回性能进行较真实的模拟是强震中结构抗倒塌研究的重要内容。基于OpenSEES平台,建立了梁柱纤维-节点核心区组合模型,对低周往复荷载下的钢筋混凝土梁-柱节点非线性滞回反应进行了数值模拟。通过与试验结果、单一梁柱纤维单元模拟结果和实体单元模拟结果的对比,验证了模型的可行性和准确性,并对模拟结果进行了分析讨论。研究表明:相比较单一的梁柱纤维单元和实体单元,采用纤维单元和二维节点单元组合模型可以更为真实地再现循环荷载下钢筋混凝土梁-柱节点的非线性滞回性能,模拟结果能够较好地反映钢筋混凝土节点在反复加载过程中的受力特点和反应特性。此外,材料本构参数、纤维单元离散数目及节点单元中剪块分量参数的取值对模拟效果有着重要的影响。

【Abstract】 To factually simulate the nonlinear hysteretic behaviors of reinforced concrete(RC) beam-column joint is an important issue in research of structure collapse prevention in strong earthquake. Based on OpenSEES procedure, the model of RC beam-column joint was built up by using combination of bar member fiber element and two-dimensional joint element. The numerical simulation on nonlinear hysteretic response of RC beam-column joint under cyclic loads was performed. According to the comparing numerical results with experimental results, simulation results only with fiber element and simulation results with solid element respectively, the feasibility and accuracy of the model was verified. Furthermore, the results of numerical simulation were discussed. The research indicates that the nonlinear hysteretic characteristics of RC beam-column joint under cyclic loads can veritably reconstructed by using the model with combination of fiber element and joint element compared to the fiber element and solid element, the numerical simulation veritably reflects the mechanical characteristics and response prosperities of beam-column joint. The parameters of material constitutive relation, number of integration points of fiber element and the parameters of shear panel component of beam-column joint element have great influence on numerical simulation.

【基金】 国家自然科学基金资助项目(51878347);国家自然科学基金资助项目(51478222);2020江苏省科研创新计划项目(KYCX20_1083)
  • 【会议录名称】 2021年工业建筑学术交流会论文集(上册)
  • 【会议名称】2021年工业建筑学术交流会
  • 【会议时间】2021-09-11
  • 【会议地点】中国北京
  • 【分类号】TU375.4
  • 【主办单位】中冶建筑研究总院有限公司
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