基于短T型钢连接的扩孔型钢结构新型节点受力性能研究

发布时间：2018-03-31 07:33

本文选题：钢结构　切入点：新型节点　出处：《福州大学》2014年硕士论文

【摘要】：本文研究的扩孔型钢结构新型节点与传统短T型钢连接节点的区别在于：将短T型钢腹板上的常规圆孔改成了长圆孔。为深入了解该新型节点的受力性能并提出可靠设计方法,本论文首先参考国内外规范关于短T型钢连接节点的设计规定,给出了新型节点的初步设计方法,并对新型节点进行了初步设计；其次,采用初步设计得到的节点尺寸对三个采用不同扩孔参数的新型节点、一个普通短T型钢连接节点和一个狗骨式节点进行了拟静力试验,研究新型节点在循环荷载作用下的受力性能；然后,利用ABAQUS建立了各节点的有限元模型,对节点在各受力阶段的应力分布、传力规律和变形特点作了深入的受力分析；最后,针对初步设计方法中存在的问题,提出了新型节点的实用设计建议,为新型节点的工程应用提供设计参考。通过本论文的相关研究,得出了以下主要结论：(一)与狗骨式节点和普通短T型钢连接节点相比,新型节点的最大塑性转角、延性和耗能能力等有明显的提高：(1)最大塑性转角分别为普通短T型钢连接节点的1.1～1.5倍,为狗骨式节点的1.8～2.5倍；(2)延性系数分别为普通短T型钢连接节点的1.2～1.5倍,为狗骨式节点的2.2～2.6倍；(3)各级滞回耗能系数之和分别为普通短T型钢连接节点的1.7～2.1倍,为狗骨式节点的6.3～8.0倍；(4)新型节点能够通过摩擦滑移增加节点耗能,通过摩擦滑移所耗散的能量最大可达节点试件总体耗能的25%。(二)各节点的有限元分析结果与试验结果吻合良好,可用本文建立的有限元模型对新型节点作进一步深入研究。有限元的模拟结果表明：(1)上下短T型钢所承担的梁端剪力相差较大,按每个短T型钢腹板各承担一半梁端剪力的验算方法偏于不安全。(2)现有规范无法对极限状态下节点的撬力进行计算,本文提出的撬力修正公式的计算结果与有限元模型中的撬力值接近,且有16%左右的提高。综上所述,改进后的新型短T型钢连接节点不但能提高节点的延性、耗能等抗震性能指标,而且还可以通过调整扩孔尺寸,实现延性、耗能等性能指标的可控性。该新型节点的提出可为后续结构的抗震性能化设计提供新的思路。
[Abstract]:In this paper, the difference between the new type joint of the reaming hole steel structure and the traditional short T-shaped steel joint is that the conventional circular hole on the short T-shaped steel web is changed into the long circular hole. In order to understand the mechanical behavior of the new type of joint and to put forward a reliable design method, In this paper, first of all, referring to the domestic and foreign specifications about the design of short T-section connections, the preliminary design method of the new joints is given, and the preliminary design of the new joints is also given. Three new joints with different reaming parameters, one ordinary T-section connection joint and one dog bone joint were tested by using the initial designed joint size. The stress behavior of the new joint under cyclic load is studied. Then, the finite element model of each joint is established by using ABAQUS, and the stress distribution, force transfer law and deformation characteristics of each joint are analyzed deeply. In view of the problems existing in the preliminary design method, the practical design suggestions of the new type joint are put forward, which can provide the design reference for the engineering application of the new type node. The main conclusions are as follows: (1) the maximum plastic turning angle of the new type of joint is compared with that of the dog bone joint and the ordinary short T-section joint. The ductility and energy dissipation capacity of the joint are obviously improved.) the maximum plastic rotation angle is 1.1 / 1.5 times of that of the ordinary T-shaped joint and 1.82.5 times of the dog's bone joint respectively.) the ductility coefficient of the joint is 1.2U / 1.5 times of that of the ordinary T-shaped joint, respectively, and the ductility coefficient is 1.5 times of that of the ordinary T-shaped joint, and the ductility coefficient is 1.82.5 times higher than that of the dog bone joint. The sum of hysteretic energy dissipation coefficients of different grades of dog bone joints is 1.7or 2.1 times of that of ordinary T-shaped connections, respectively, and 6.3o8.0 times of dog bone-type joints). The new type of joints can increase the energy consumption of the joints through friction slip. The results of finite element analysis of the total energy dissipation of the joint specimens by friction slippage are in good agreement with the experimental results, and the results of the finite element analysis of the joints are in good agreement with the experimental results. The finite element model established in this paper can be used to further study the new joints. The results of finite element simulation show that the shear force at the end of beam bearing by the upper and lower short T-section steel is quite different. According to the method of checking the shear force at the end of each short T-shaped steel web bearing half of the beam end, the existing code is not able to calculate the prying force of the joint under the limit state. The calculated results of the pry force correction formula presented in this paper are close to those in the finite element model, and they are increased by about 16%. In conclusion, the improved new type of T-shaped steel connections can not only improve the ductility of the joints, but also improve the ductility of the joints. The seismic performance indexes such as energy dissipation and so on can be controlled by adjusting the size of reaming holes to realize the controllability of ductility and energy dissipation. The proposed new joint can provide a new way of thinking for the seismic performance design of subsequent structures.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU392.1

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