双侧板贯穿式钢管混凝土柱—钢梁节点抗震性能研究

发布时间：2018-06-07 13:49

本文选题：钢管混凝土柱-钢梁 + 双侧板贯穿式节点　；参考：《武汉大学》2013年博士论文

【摘要】：钢管混凝土柱和钢梁组成的组合结构因其优越的力学性能和抗震性能,在高层和超高层建筑中得到广泛应用,被认为是现代建筑中一种理想的结构形式。国内外学者对此开展了广泛的理论分析和工程应用研究,使钢管混凝土柱的理论体系日趋完善,计算方法不断成熟,《矩形钢管混凝土结构技术规程》(CECS159:2004)的颁布进一步推动了组合结构发展。节点是组合结构的关键部位,其连接构造不仅决定了节点的内力传递方式,而且直接影响结构的力学性能和抗震性能,同时决定了钢梁和钢管混凝土柱优良力学性能的发挥程度。近年来,国内外专家学者对组合结构节点连接进行了深入研究,提出了一些新型节点连接形式,但可供工程选用的成熟节点较少。《矩形钢管混凝士结构技术规程》虽然推荐了外隔板式节点、内隔板式节点和外伸内隔板节点,但远远不能满足工程的需要。因此,研究构造简单、受力合理、抗震性能优越的节点,是推动钢管混凝土柱一钢梁组合结构应用和发展的关键。本文的主要工作和成果如下： 1.在广泛查阅田内外该领域文献的基础上,深入分析钢管混凝土柱和钢梁节点形式,指出各类节点的优缺点,为设计人员选用已有节点点形式提供参考,同时为这类节点的进一步深入研究提供依据。 2.系统分析已有节点的构造形式和细节对节点受力性能的影响,深入剖析焊接工艺孔造成的连接处缺陷对节点承载力和抗震性能的影响,以及钢梁翼缘对接焊缝引起焊缝附近金属脆性破坏的原因,参考国内外节点构造改进方法,提出了新型的节点形式—双侧板贯穿式钢管混凝土柱—钢梁节点 3.设计制作17个十字形中间节点试件,通过静力试验考察节点核心区的应变分布情况、破坏形式、极限承载力等；通过拟静力试验考察节点塑性铰的发生位置、塑性域的扩张情况、节点在低周往复荷载作用下的滞回性能等,分析贯穿式侧板各特征参数对节点受力性能和抗震性能的影响。试验结果表明：贯穿式侧板有效地减小了钢梁上翼缘与钢管柱连接处的应力和应变梯度；梁端荷载一位移滞回曲线均呈梭形,比较饱满,没有捏缩现象；节点域钢梁未发生过大的变形和破坏,节点的屈服和破坏均发生在穿心板外0.5h。(梁高)附近,属于延性破坏。 4.考虑接触非线性、几何非线性和材料非线性,采用大型有限元软件ABAQUS分析静力和拟静力荷载作用下节点域的应变规律和节点抗震性能,将计算结果和试验结果进行比较分析,进一步分析轴压比、混凝土强度等级、贯穿式侧板各特征参数等对节点力学和抗震性能的影响,揭示节点的应力传递路径,并对核心区钢管内混凝土和贯穿式侧板的应变情况等进行补充分析。结果表明：侧板贯穿式充分利用了钢管混凝土柱的横向力学性能,梁根处应力中和轴与几何形心轴不重合,是一种非对称节点；贯穿式侧板节点核心区的应力传递路径与常用节点不同，其钢梁翼缘拉力沿侧板呈“Z”字形传递,压力主要沿核心区对角线上的混凝土短柱传递,传递路径为空间体系；贯穿式侧板的形状和各参数对节点的抗震性能影响不大,但对侧板的应力分布有较大影响。 5.基于试验研究和有限元分析的结果,明确了节点核心区的应力传递路径,揭示了节点的传力机理和屈服机制,运用虚功原理和叠加法,建立节点的受弯、受剪承载力计算方法及相应公式。最后,在总结全文的基础上，，对该课题的进一步研究提出建议。
[Abstract]:The composite structure of concrete filled steel tube columns and steel beams has been widely used in high rise and super high-rise buildings because of its superior mechanical and seismic performance. It is considered to be an ideal structural form in modern architecture. Scholars at home and abroad have carried out extensive theoretical analysis and engineering application research to make the theory of concrete filled steel tube columns. The system is becoming more and more perfect and the calculation method is mature. The promulgation of the technical specification for the rectangular concrete-filled steel tube structure (CECS159:2004) further promotes the development of the composite structure. The node is the key part of the composite structure. The connection structure not only determines the internal force transmission mode of the node, but also directly affects the mechanical and seismic performance of the structure. The mechanical properties of steel beams and concrete-filled steel tubular columns are determined.
In recent years, experts and scholars at home and abroad have deeply studied the joint connection of composite structures, and put forward some new type of joint connection, but less mature nodes can be used for engineering. The technical specification for the concrete-filled steel pipe concretion structure has been recommended, although it recommends the outer plate type node, the inner partition type node and the extension inner partition node, but it is far from full. Therefore, it is the key to promote the application and development of the composite structure of steel tube columns and steel beams. The main work and achievements of this paper are as follows:
1. on the basis of extensive literature on the field and in the field, the form of concrete filled steel tubular column and steel beam node is deeply analyzed, the advantages and disadvantages of all kinds of joints are pointed out, which provide reference for the designers to choose the existing node point form, and provide the basis for further in-depth study of this kind of node.
2. the influence of the structural form and details of the existing nodes on the force performance of the joints is analyzed, and the influence of the joint defects on the bearing capacity and the seismic performance of the joints caused by the welding process holes, as well as the causes of the brittle failure of the metal near the weld seam caused by the butt weld of the steel beam flange are analyzed, and the improvement method of the joint structure at home and abroad is proposed. A new type of joint form - two side through concrete filled steel tubular column - steel beam joint.
3. design and manufacture 17 cross section test parts. Through static test, the strain distribution, failure mode and ultimate bearing capacity of the core area are investigated. Through the pseudo static test, the occurrence position of plastic hinge, the expansion of plastic region and the hysteretic behavior of the node under the action of low cycle to complex load are analyzed, and the penetration side is analyzed. The experimental results show that the stress and strain gradient of the joint of the upper flange and the steel tube column of the steel beam can be reduced effectively by the perforation side plate, and the displacement hysteresis curves of the beam end load are all shuttle shape, and there is no pinching phenomenon, and the steel beam in the nodal region has not changed much. The yield and failure of joints occur in the vicinity of 0.5H. (beam height) outside the core plate and belong to ductile failure.
4. considering the contact nonlinearity, geometric nonlinearity and material nonlinearity, a large finite element software ABAQUS is used to analyze the strain law and the seismic performance of nodes under static and quasi-static loads. The calculation results are compared with the experimental results, and the axial compression ratio, the strength grade of concrete and the characteristic parameters of the cross side plate are analyzed. The influence of number and other on the mechanical and seismic behavior of the joints is revealed, and the stress transfer path of the joints is revealed, and the strain situation of the concrete and the cross side plate in the core area is supplemented. The results show that the lateral plate penetration is fully used for the transverse mechanical energy of the concrete filled steel tube column, and the stress neutralization axis and the geometric center axis are not in the beam root. The stress transfer path of the core area of the cross side plate is different from that of the common node. The tension of the flange of the steel beam is transferred along the side plate "Z", and the pressure is mainly transferred along the concrete short column on the diagonal line of the core area. The transfer path is the space body system; the shape of the cross side plate and the parameters of the nodes are on the node. The seismic performance has little effect, but it has a great influence on the stress distribution of side panels.
5. based on the results of experimental research and finite element analysis, the stress transmission path of the core area of the node is clarified, the mechanism of the force transmission and the yield mechanism are revealed. The principle of virtual work and the superposition method are used to establish the bending of the node, the calculation method of shear bearing capacity and the corresponding formula.
Finally, on the basis of summarizing the full text, suggestions for further research on the subject are put forward.
【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU398.9

【参考文献】