發(fā)布時間：2018-05-11 09:53

  本文選題：高性能鋼筋混凝土 + 梁柱節(jié)點��； 參考：《華中科技大學》2013年碩士論文

【摘要】：本文對鋼筋混凝土框架中間層節(jié)點的研究現狀進行了綜述，歸納出框架中間層節(jié)點的破壞方式，研究了定量分析節(jié)點破壞模式的理論可行性，發(fā)現約束機構和組合塊體機構是斜壓桿—桁架機構在加載過程中的理論延續(xù)。進入到加載后期，隨著斜壓桿—桁架機構作用的退化，約束機構和組合塊體機構的存在使得節(jié)點可以繼續(xù)承擔外部荷載。 用ANSYS對配置HRB500E高性能鋼筋混凝土框架中間層邊節(jié)點進行有限元建模，預測了邊節(jié)點試件的破壞模式：JD2和JD3發(fā)生梁端彎曲破壞，JD1同時發(fā)生梁端彎曲破壞和剪切破壞。為了研究軸壓比、節(jié)點核心區(qū)配箍率和剪壓比對配置高性能鋼筋混凝土框架中間層邊節(jié)點抗剪承載力的影響，本文對已有構件進行了擴展。對比已有構件和擴展構件的ANSYS運算結果，得出在中低剪壓比條件下，增大軸壓比可以提高節(jié)點的剛度和抗剪承載力，節(jié)點核心區(qū)的配箍率能顯著提高節(jié)點的抗剪承載力。剪壓比雖然對節(jié)點核心區(qū)的抗剪承載力沒有影響，但它和節(jié)點核心區(qū)配箍率是影響框架中間層節(jié)點破壞模式的主要因素。在中低剪壓比下，節(jié)點會發(fā)生梁端的彎曲破壞；在中高剪壓比下，隨著節(jié)點核心區(qū)配箍率的增大，，節(jié)點核心區(qū)依次發(fā)生斜拉破壞、剪壓破壞和斜壓破壞。
[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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU375

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