高性能钢筋混凝土梁柱节点的抗剪承载力研究

发布时间：2018-05-11 09:53

本文选题：高性能钢筋混凝土 + 梁柱节点　；参考：《华中科技大学》2013年硕士论文

【摘要】：本文对钢筋混凝土框架中间层节点的研究现状进行了综述，归纳出框架中间层节点的破坏方式，研究了定量分析节点破坏模式的理论可行性，发现约束机构和组合块体机构是斜压杆—桁架机构在加载过程中的理论延续。进入到加载后期，随着斜压杆—桁架机构作用的退化，约束机构和组合块体机构的存在使得节点可以继续承担外部荷载。用ANSYS对配置HRB500E高性能钢筋混凝土框架中间层边节点进行有限元建模，预测了边节点试件的破坏模式：JD2和JD3发生梁端弯曲破坏，JD1同时发生梁端弯曲破坏和剪切破坏。为了研究轴压比、节点核心区配箍率和剪压比对配置高性能钢筋混凝土框架中间层边节点抗剪承载力的影响，本文对已有构件进行了扩展。对比已有构件和扩展构件的ANSYS运算结果，得出在中低剪压比条件下，增大轴压比可以提高节点的刚度和抗剪承载力，节点核心区的配箍率能显著提高节点的抗剪承载力。剪压比虽然对节点核心区的抗剪承载力没有影响，但它和节点核心区配箍率是影响框架中间层节点破坏模式的主要因素。在中低剪压比下，节点会发生梁端的弯曲破坏；在中高剪压比下，随着节点核心区配箍率的增大，，节点核心区依次发生斜拉破坏、剪压破坏和斜压破坏。
[Abstract]:In this paper, the research status of RC frame interlayer joints is summarized, and the failure modes of RC frame interlayer joints are summarized, and the theoretical feasibility of quantitative analysis of joint failure modes is studied. It is found that the constraint mechanism and the combined block mechanism are the theoretical continuation of the oblique bar-truss mechanism during the loading process. At the later stage of loading, with the degradation of the action of oblique compression bar and truss mechanism, the existence of constraint mechanism and combined block mechanism makes the joint continue to bear external loads. In this paper, the finite element model of the edge joints in the middle layer of reinforced concrete frame with HRB500E is modeled by ANSYS, and the failure modes of the specimens with edge joints are predicted, that is, the beam end bending failure and the shear failure occur simultaneously with the beam end bending failure in JD3 and the beam end bending failure. In order to study the influence of axial compression ratio hoop ratio and shear compression ratio on the shear bearing capacity of the joints with high performance RC frame the existing members are expanded in this paper. Compared with the ANSYS calculation results of existing members and extended members, it is concluded that increasing axial compression ratio can improve the stiffness and shear bearing capacity of joints under the condition of low shear compression ratio, and the hoop ratio in the core area of joints can significantly improve the shear capacity of joints. Although the shear compression ratio has no effect on the shear bearing capacity of the joints in the core zone, it and the hoop ratio in the core zone of the joints are the main factors affecting the failure mode of the joints in the middle layer of the frame. Under the low shear compression ratio, the beam end bending failure will occur, and at the medium to high shear compression ratio, the diagonal failure, shear compression failure and baroclinic failure will occur with the increase of hoop ratio in the core area of the joint.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375

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