基于超级节点模型的框架结构地震反应分析
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TU 375.4

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国家自然科学(51878100)


Seismic Response Analysis of Frame Structures Based on Super Joint Element Model
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    摘要:

    众多钢筋混凝土梁柱组合体试验结果表明,节点内梁纵筋粘结滑移和节点区剪切变形对组合体试件的抗震性能有明显影响,但钢筋混凝土框架结构的非线性地震反应分析一般采用刚性节点假定,在有限元模型中忽略了上述两种节点非弹性变形的影响。基于OpenSees分析平台,本文采用较为精细的“超级节点单元模型”模拟节点非弹性反应,以典型平面框架结构为例分别建立了考虑节点非弹性变形、不考虑节点变形的有限元模型,对比了两个框架有限元模型在7条地震波作用下的整体、局部反应计算结果。分析结果表明,相对于不考虑节点变形的有限元模型,考虑节点非弹性变形后框架顶点位移最大值变化不明显,层间位移角最大值略有减小;由于部分梁端非弹性变形转移到节点区,杆端出铰率、转角延性系数减小;按我国现行规范设计的8度0.2g区二级抗震框架在大震下一般不会出现节点剪切失效。

    Abstract:

    Many experiment results of RC beam-column subassemblage indicates that slippage of longitudinal bar of beam within the joint and shear deformation of joint have significant influence on seismic behavior of the subassemblage. However, rigid joint assumption has been generally used in the seismic response analysis of RC frames, and the two kind of inelastic deformations of joint have been ignored in the finite element models. Based on OpenSees platform, “Super Joint Element Model” with more detailed inelastic mechanism was used to simulate the inelastic response of joints. Two kinds of finite element model of typical RC planar frame were established, namely considering or ignoring the joint inelastic deformations respectively. The effect of joint inelastic deformations on the global and local responses of the frame under seven strong earthquake waves was analyzed contrastively. The results show that the maximum top displacements change slightly, the maximum inter-story drift ratios increase slightly, the quantities of plastic hinge of beam and column ends decrease, the rotation ductility demand of beam and column ends decrease on the whole, and parts of beam ends inelastic deformation transfer to the joint when joint inelastic deformations were considered. For the second grade earthquake-resistant frameSthat is designed according to the current code of China for 8 degrees 0.2g seismic district, shear failure of beam-column joint is unlikely to appear under rare earthquakes.

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赵雯桐,杨红,李戌,等. 基于超级节点模型的框架结构地震反应分析[J]. 科学技术与工程, 2020, 20(17): 6983-6990.
Zhao Wentong, Yang Hong, Li Xu, et al. Seismic Response Analysis of Frame Structures Based on Super Joint Element Model[J]. Science Technology and Engineering,2020,20(17):6983-6990.

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  • 收稿日期:2019-08-19
  • 最后修改日期:2020-06-15
  • 录用日期:2019-11-17
  • 在线发布日期: 2020-07-07
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