钢梁与混凝土剪力墙平面外节点抗震性能试验研究

发布时间：2018-04-24 12:34

本文选题：平面外节点 + 双锚板穿筋　；参考：《沈阳建筑大学》2013年硕士论文

【摘要】：近年来混合结构体系在我国的高层及超高层建筑中得到了比较广泛的应用,但目前相关的研究主要集中在该种结构体系在罕遇地震作用下结构破坏形态、地震作用下结构层间相对位移控制等整体参数方面,而对总体位移与刚度影响较大的钢梁与混凝土剪力墙平面外节点受力研究则还较少。钢梁与混凝土剪力墙平面外节点处于弯、剪、压复合应力状态,受力复杂,因此对该类型节点的受力性能和破坏机理进行深入研究,使节点设计的传力明确、计算可靠、构造合理、施工方便是十分重要的。在前人研究的基础上,对1组(三个试件)双锚板穿筋锚固的节点及1组(三个试件)90。弯钩锚固节点试件进行了低周反复荷载试验,研究这两种节点在低周反复荷载作用下的承载力和抗震性能,并使用ABAQUS进行了有限元分析。通过试验研究并根据试验数据及试验现象,分析了各试件在低周反复荷载作用下的破坏形态、滞回曲线、承载力、刚度退化、延性、耗能能力、主要部位的应变等特征。结果表明：通过双锚板穿筋锚固节点与90。弯钩锚固节点的试验结果对比,证明墙背面锚板能够提高锚筋的锚固性能,因此有效提高承载力和变形能力；双锚板穿筋锚固节点与90。弯钩锚固节点相比,在延性和耗能能力方面没有明显的差别；在平面外弯矩和轴压力作用下,剪力墙受力不均匀并使其纵向钢筋和水平钢筋应变较大,围绕着锚板沿墙高和墙宽的方向有一个有效受力范围。剪力墙高度和宽度方向上在锚板附近区域的应力高于远离锚板的区域；在双锚板穿筋锚固节点和90。弯钩锚固节点中,反复荷载作用下与钢梁翼缘连接处锚板出现向外鼓屈现象,这种破坏对锚筋的受力性能不利,应采取措施改变构造。试验结果与有限元软件ABAQUS分析结果进行了比较,试验结果与有限元分析结果基本吻合。在此基础上通过有限元模拟分析得知,在满足基本构造要求的前提下,改变锚板厚度、锚筋布置方式能显著改变这两种节点的承载力和抗震性能；在这两种节点形式下较高的轴压比对承载力和延性有不利的影响。在总结本论文基础上,提出了一些尚待解决的问题。需要进行大量试验来研究锚筋截面面积、锚板厚度、锚板长度、锚筋布置和混凝土强度等因素对钢梁与混凝土剪力墙平面外节点试件抗震性能的影响；完善对该节点形式破坏模式的研究并建立合理的破坏模型,根据大量的试验数据推导出钢梁与混凝土剪力墙平面外节点的承载力计算公式。
[Abstract]:In recent years, hybrid structure system has been widely used in high-rise and super-tall buildings in our country, but at present, the related research mainly focuses on the structural failure pattern of this kind of structure system under rare earthquake. On the whole parameters such as the relative displacement control of the structure under seismic action, there are few researches on the external joints of steel beam and concrete shear wall, which have great influence on the total displacement and stiffness. The joint of steel beam and concrete shear wall is in the state of bending, shear, compression and complex stress, so the mechanical behavior and failure mechanism of this type of joint are deeply studied, so that the transmission force of the joint design is clear and the calculation is reliable. The structure is reasonable and the construction convenience is very important. On the basis of previous studies, the joints of group 1 (3 specimens) and group 1 (3 specimens) of double anchor plate with reinforcement anchoring are studied. The load-bearing capacity and seismic behavior of the two joints under low cyclic cyclic loading were studied by means of low-cycle repeated load tests. The finite element analysis was carried out with ABAQUS. Based on the experimental data and experimental phenomena, the failure patterns, hysteretic curves, bearing capacity, stiffness degradation, ductility, energy dissipation capacity and strain of the main parts of the specimens under low cyclic cyclic loading are analyzed. The results show that the joint and 90. The experimental results show that the anchor plate on the back of the wall can improve the anchoring performance of the anchor bar, so it can effectively improve the bearing capacity and deformation capacity. There is no obvious difference in ductility and energy dissipation capacity between bending hook and anchoring joints. Under the action of off-plane bending moment and axial pressure, the shear wall is subjected to non-uniform force and makes the longitudinal and horizontal steel bar strain larger. There is an effective force range around the anchor plate along the direction of the wall height and the width of the wall. The stress in the direction of height and width of shear wall is higher than that in the area far away from anchor plate in the direction of height and width of shear wall; In the bending hook Anchorage joint, the external bulging and bending of the anchor plate at the joint with the steel beam flange under repeated loads is unfavorable to the mechanical behavior of the anchor bar, so some measures should be taken to change the structure. The experimental results are compared with the results of finite element analysis software ABAQUS. The experimental results are in good agreement with the results of finite element analysis. On this basis, the finite element simulation analysis shows that under the premise of meeting the basic structural requirements, the anchor reinforcement arrangement can significantly change the bearing capacity and seismic performance of the two joints by changing the thickness of the anchor plate. The higher axial compression ratio has adverse effects on bearing capacity and ductility. Based on the conclusion of this paper, some problems remain to be solved. A large number of tests are needed to study the effects of such factors as the cross-section area of anchor bar, the thickness of anchor plate, the length of anchor plate, the arrangement of anchor bars and the strength of concrete on the seismic behavior of steel beam and concrete shear wall specimens. The failure mode of the joint is studied and a reasonable failure model is established. Based on a large number of experimental data, the formula for calculating the bearing capacity of the steel beam and concrete shear wall off-plane joint is derived.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.14;TU973.31

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