方钢管混凝土柱—外包U形钢混凝土组合梁内隔板式节点的受力性能研究

发布时间：2018-04-01 20:33

本文选题：外包U形钢混凝土组合梁　切入点：方钢管混凝土柱　出处：《山东建筑大学》2017年硕士论文

【摘要】：方钢管混凝土柱-外包U形钢混凝土组合梁内隔板式节点的研究资料很少,对该类型节点的受力性能和承载能力的研究还不够成熟,因此对内隔板式节点开展研究具有重要的理论意义与工程价值。本文在本课题组已有研究基础上,提出了构造简单、施工方便、便于实现装配化的两种新型节点形式-内隔板钢筋套筒式节点和内隔板钢筋贯穿式节点,并对两种节点的受力性能进行了深入的对比研究,主要研究工作和取得的成果如下:基于本课题组已完成的试验研究,对试验中的内隔板钢筋截断式节点进行低周往复荷载作用下的有限元模拟分析,并将有限元计算结果与试验结果进行对比,两者基本吻合。在模型验证的基础上,对两种新型节点进行三维非线性有限元分析,探讨了节点的破坏形态和承载能力,考察了节点的内力,较为精确地对比分析了两种节点的应力分布规律和传力机制。研究结果表明:内隔板钢筋套筒式节点和内隔板钢筋贯穿式节点的破坏形态基本类同,均发生梁端弯曲破坏;正弯矩作用下两节点的承载力相差不大,在负弯矩作用下内隔板钢筋套筒式节点承载力高于内隔板钢筋贯穿式节点;内隔板钢筋贯穿式节点柱壁开孔不仅削弱了柱的承载力,而且负弯矩钢筋周围的钢管柱腹板以及混凝土处出现了较为明显的应力集中现象,而内隔板钢筋套筒式节点由于上部隔板存在,节点域协调变形能力较好,使得节点域方钢管柱壁和核心混凝土应力分布均匀。设计大量的有限元分析试件,对影响节点承载力的诸多因素进行分析,研究组合梁的高宽比、组合梁翼板厚度、U形钢梁壁厚、翼板的纵向配筋率、内部隔板的厚度、柱轴压比等参数对内隔板式节点承载力性能的影响。分析结果表明:组合梁的高宽比、组合梁翼板厚度对节点承载力有显著影响,U形钢梁壁厚、翼板的纵向配筋率对节点承载力有一定的影响,轴压比、内部隔板的厚度在一定的范围内对节点承载力影响不明显。最后,在参数分析的基础上,提出新型节点的设计建议。
[Abstract]:The research data of the inner partition joints of concrete-filled square steel tubular column and U-shaped steel reinforced concrete composite beams are few, and the research on the mechanical behavior and bearing capacity of this type of joints is not mature enough. Therefore, it is of great theoretical significance and engineering value to carry out research on the inner partition joints. On the basis of the existing research in our group, the paper puts forward that the structure is simple and the construction is convenient. There are two new types of joints that are convenient for assembly, I. e., inner partition steel sleeve joints and inner partition steel bar penetrating joints. The mechanical properties of the two kinds of joints are compared and studied in depth. The main research work and results obtained are as follows: based on the experimental research completed by our group, the finite element simulation analysis of the truncated joints of inner partition steel bar under low cycle reciprocating load is carried out. The finite element results are compared with the experimental results. Based on the model verification, the three dimensional nonlinear finite element analysis of two new types of joints is carried out, and the failure patterns and bearing capacity of the joints are discussed. The internal forces of the joints are investigated, and the stress distribution law and the force transfer mechanism of the two joints are compared and analyzed accurately. The results show that the failure patterns of the inner partition steel bar sleeve joint and the inner partition steel bar penetrating joint are basically the same. The bearing capacity of the two joints under the action of positive moment is not different, and the bearing capacity of the inner partition steel bar sleeve joint is higher than that of the inner partition steel bar through joint under the negative moment. The perforation of internal partition steel bar through the wall of the column not only weakens the bearing capacity of the column, but also shows a more obvious stress concentration phenomenon in the web of steel tube column and concrete around the negative moment steel bar. However, due to the existence of the upper spacer and the better coordinated deformation capacity in the joint domain, the stress distribution of square steel pipe column wall and core concrete in the joint domain is uniform. A large number of finite element analysis specimens are designed. Many factors affecting the bearing capacity of joints are analyzed. The ratio of height to width of composite beam, the thickness of wing plate, the thickness of U-shaped steel beam, the longitudinal reinforcement ratio of flange, the thickness of internal partition are studied. The influence of column axial compression ratio and other parameters on the bearing capacity of inner diaphragm joints is analyzed. The results show that the height to width ratio of composite beams and the thickness of wing plates of composite beams have a significant effect on the bearing capacity of U-shaped steel beams. The longitudinal reinforcement ratio of the flange has a certain influence on the bearing capacity of the joints, but the axial compression ratio and the thickness of the internal diaphragm have no obvious influence on the bearing capacity of the joints. Finally, based on the analysis of the parameters, the design suggestions for the new joints are put forward.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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