侧板连接T形钢管混凝土柱—钢梁节点受力性能研究

发布时间：2018-01-13 02:19

本文关键词：侧板连接T形钢管混凝土柱—钢梁节点受力性能研究　出处：《中原工学院》2017年硕士论文　论文类型：学位论文

【摘要】：异形钢管混凝土柱可使柱肢与填充墙等厚,避免室内出现棱柱,具有较好的建筑使用功能。然而,异形钢管混凝土结构梁柱节点类型偏少,难以满足实际工程多样化的需求,且设计方法不能完全满足工程应用的需要。针对目前异形钢管混凝土柱—钢梁连接节点研究成果不系统、节点力学性能与施工便利性不能两全且现有的节点类型较少的现状,本文提出新型的侧板连接T形钢管混凝土柱—钢梁节点形式,并采用数值模拟与理论分析相结合的方法,对其受力性能进行系统的研究。首先,采用ABAQUS有限元软件建立本文提出的侧板连接T形钢管混凝土柱与钢梁节点的精细化有限元模型;其次,对其进行数值模拟研究,探讨节点的受力性能与传力路径;最后,对节点进行参数拓展分析,提出节点的优化设计模型,具体进行以下三个方面的工作:(1)提出侧板连接T形钢管混凝土柱—钢梁节点的构造形式,并建立节点的精细化有限元模型。为了验证该模型的有效性,建立与文献资料试验构件尺寸,材性均相同的6个组合T形钢管混凝土柱的有限元实体模型,并对模型分别进行轴心受压的数值模拟分析。研究结果表明:组合T形钢管混凝土有限元计算数值模拟曲线与试验曲线吻合良好,证明本文建立的节点有限元模型中边界条件、单元选择、网格划分及相关参数的选取较为合理,为侧板连接T形钢管混凝土柱—钢梁节点的有限元数值模拟分析提供例证。(2)对节点的精细化有限元模型进行单调加载模拟分析。模拟节点在试验状态下可达到的边界约束条件及加载方式,在柱顶施加恒定的轴力并在梁端施加单调荷载,分析节点在荷载共同作用下的应力分布规律及变形过程。研究结果表明:侧板对T形钢管混凝土柱的约束作用明显,节点破坏形式主要表现为连接板未端梁翼缘发生屈服破坏,钢管混凝土柱受拉区域有轻微起鼓现象,节点区域未出现明显破坏。在钢梁进入屈服状态时,钢管混凝土柱及节点区域仍处于弹性阶段并具有良好的刚度,说明该节点满足“强柱弱梁,节点更强”的设计要求。(3)对节点的精细化有限元模型进行参数拓展分析。考虑了轴压比、材料属性、钢管宽厚比、连接板强度、侧板长度等参数,研究其对节点受力性能的影响,并得出相应的弯矩—转角关系曲线。研究结果表明:随着侧板长度、连接板翼缘厚度的增大,节点刚度变大;钢梁翼缘厚度、钢管本身强度及连接板强度均达到一定值后不会再对节点刚度产生影响;轴压比、核心混凝土强度等级、侧板强度及钢管宽厚比对节点力学性能无明显影响;侧板厚度减小,节点刚度增大,在一定范围后无明显变化;连接板长度越小,节点刚度越大。
[Abstract]:Concrete-filled steel tubular column can make column limb and fill wall equal thickness, avoid the appearance of prisms in the room, and have better building function. However, the type of beam-column joint of concrete-filled steel tubular structure is less than that of special-shaped concrete filled steel tube structure. It is difficult to meet the diversified needs of practical projects, and the design method can not fully meet the needs of engineering applications. In this paper, a new type of T-shaped concrete-filled steel tubular column-steel beam joint is proposed. With the combination of numerical simulation and theoretical analysis, the mechanical performance of the system is studied systematically. First of all. The fine finite element model of T-shaped concrete-filled steel tubular column and steel beam joint is established by using ABAQUS finite element software in this paper. Secondly, the numerical simulation is carried out to study the behavior of the joints and the path of the force transfer. Finally, the parameter expansion analysis of the joint is carried out, and the optimal design model of the joint is put forward, and the following three aspects are carried out specifically: 1) the structure of the T-shaped concrete-filled steel tubular column-steel beam joint with side slab is proposed. In order to verify the validity of the model, the finite element model of six composite T-shaped concrete-filled steel tubular columns with the same size and material properties was established. The results show that the numerical simulation curve of composite T-shaped concrete filled steel tube is in good agreement with the experimental curve. It is proved that the boundary conditions, element selection, mesh division and the selection of related parameters are more reasonable in the node finite element model established in this paper. It provides an example for the finite element numerical simulation analysis of T-shaped concrete-filled steel tubular column-steel beam joints connected with side plates. The detailed finite element model of nodes is simulated by monotone loading. The boundary constraints and loading modes can be achieved in the experimental state. A constant axial force is applied at the top of the column and a monotone load is applied at the end of the beam. The stress distribution and deformation process of the joints under the joint load are analyzed. The results show that the lateral slab has obvious constraint on T-shaped concrete-filled steel tubular columns. The main failure form of the joint is the failure of the flange of the unended beam of the connection plate, the slightly bulging phenomenon in the tension zone of concrete filled steel tube column, and no obvious damage in the joint area. When the steel beam enters into the yield state. The concrete filled steel tubular column and the joint area are still in the elastic stage and have good stiffness, which indicates that the joint meets the requirements of "strong column and weak beam". The design requirement of "stronger joints" is used to expand the parameters of the fine finite element model of the joints. The parameters such as axial compression ratio, material properties, steel pipe width to thickness ratio, connection plate strength, side plate length and so on are taken into account. The results show that the stiffness of the joint increases with the length of the side plate and the thickness of the flange of the connecting plate. The thickness of steel beam flange, the strength of steel tube and the strength of connecting plate will not affect the stiffness of the joint. The axial compression ratio, the grade of core concrete strength, the strength of side slab and the ratio of steel pipe width to thickness have no obvious influence on the mechanical properties of joints. The thickness of the side plate decreases, the stiffness of the joint increases, and there is no obvious change after a certain range. The smaller the connection plate length, the greater the joint stiffness.
【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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