SRC柱—钢梁混合框架节点受力性能研究

发布时间：2018-06-22 03:44

本文选题：型钢混凝土 + SRC　；参考：《郑州大学》2017年硕士论文

【摘要】：作为一种新型的建筑结构体系,SRC组合结构在强度、延性耗能能力等方面都显著优于普通RC结构,具有良好的抗震性能。节点在梁柱之间担任传力枢纽,属于框架结构中的重要部位。在大多数地震中,很多建筑物的倒塌归结于节点连接处破坏严重,而单一的梁柱本身破坏轻微,说明了节点的正常工作是确保整个结构安全的前提。本文通过试验研究和理论分析弄清楚SRC节点的受力机理和传力途径,得到合理的计算模型和构造措施,为SRC组合结构在工程实践上的应用提供可靠的参考。本文针对SRC节点众多形式中的SRC柱-钢梁节点展开研究,以轴压比为主要因素,进行了4个节点的低周反复荷载试验,并在其中一个试件的核心区配置X筋探讨其能否提高混凝土的抗裂度。试验结果表明4个节点的滞回曲线均比较饱满,无明显的捏拢现象,体现出良好的延性耗能能力。节点的破坏形式主要为剪切破坏,虽然轴压力的存在可以抑制延缓混凝土裂缝的出现开展,但过大的轴压力使节点的剪切破坏转变为梁端弯曲破坏。混凝土的初裂荷载很好地验证了在核心区配置X筋能延缓裂缝的出现,有效地提高混凝土的抗裂度。按照试验数据,把剪力实测值与理论值进行对比,对相关规范抗剪承载力计算公式提出修改建议。利用有限元软件ABAQUS对试验的四个试件进行数值模拟分析。结果表明试验值与理论值整体吻合较好,说明了ABAQUS在模拟结构非线性行为上具有很好的可行性,同时能较好地模拟结构宏观的损伤情况。在此基础上,对混凝土强度等级、配箍率、加劲肋厚度、腹板厚度四个参数进行有限元分析,探讨它们对节点承载力的影响。通过对比分析,发现增加腹板的厚度是提高节点承载力最直接有效的方式。
[Abstract]:As a new type of building structure system, SRC composite structure is superior to ordinary RC structure in strength, ductility energy dissipation and so on, and has good seismic performance. The node acts as the transmission hub between the Liang Zhu and belongs to the important part of the frame structure. In most earthquakes, the collapse of many buildings is attributed to the serious damage at the joint joints, while the single Liang Zhu itself is slightly damaged, which shows that the normal operation of the joints is the prerequisite to ensure the safety of the whole structure. By means of experimental study and theoretical analysis, this paper makes clear the mechanism of SRC joint force and the way of force transfer, obtains reasonable calculation model and construction measures, and provides a reliable reference for the application of SRC composite structure in engineering practice. In this paper, the SRC column-steel beam joints in many forms of SRC joints are studied. The low cycle cyclic loading tests of four joints are carried out with axial compression ratio as the main factor. In one of the specimens, X bars are arranged in the core area to find out whether they can improve the crack resistance of concrete. The experimental results show that the hysteretic curves of the four nodes are full, and there is no obvious pinch phenomenon, showing a good ductility energy dissipation capacity. The main failure form of joints is shear failure. Although the existence of axial pressure can restrain the occurrence and development of concrete cracks, the excessive axial pressure changes the shear failure of joints into bending failure at the end of beam. The initial crack load of concrete proves that X bars in the core region can delay the occurrence of cracks and effectively improve the crack resistance of concrete. According to the experimental data, the experimental values of shear force are compared with the theoretical values, and some suggestions for modifying the formula of shear bearing capacity of relevant codes are put forward. The finite element software Abaqus was used to simulate the four specimens. The results show that the experimental data are in good agreement with the theoretical values, which indicates that Abaqus is feasible in simulating the nonlinear behavior of structures and can simulate the macroscopic damage of the structures at the same time. On this basis, the four parameters of concrete strength grade, hoop ratio, stiffening rib thickness and web thickness are analyzed by finite element method, and the influence of them on the bearing capacity of joints is discussed. Through comparative analysis, it is found that increasing the thickness of web is the most direct and effective way to increase the bearing capacity of joints.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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