【作者】 陈炜；

【导师】 黄冀卓；

【作者基本信息】 福州大学 ， 建筑与土木工程（专业学位）， 2014， 硕士

【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。更多还原

【Abstract】 This paper has a research on the new-type steel T-stub connections with slotted holes. In order to understand the mechanical behavior of new-type steel T-stub connections and propose design recommendations for engineering application, the following work has been completed:Firstly, on the basis of the technical standards about steel T-stub connections at home and abroad,we put forward a preliminary design method of new-type steel T-stub connections and designed the new-type steel T-stub connections according to the method. Secondly, quasi-static experiment research of full size connections which were designed by the preliminary design method was performed. Experimental specimens included three new-type steel T-stub connections with different sizes of slotted holes, an ordinary steel T-stub connection, and a dog bone connection. Thirdly, the finite elements software ABAQUS was adopted to establish the three-dimensional finite element models of experiment specimens. The finite element models were used to study the stress distribution, law of force and deformation characteristics of the new-type steel T-stub connections. Lastly, in terms of existential defects in the preliminary design method, a recommendation for the practical design of the new-type steel T-stub connections was proposed, aiming to provide reference for engineering application.Through the research of this paper, the main conclusions are shown as follow:(1) Compared with the dog bone connection and the ordinary steel T-stub connection, the plastic rotation angle, ductility and energy dissipating of the new-type steel T-stub connections are significantly improved:1) the plastic rotation angle of the new-type steel T-stub connections are 1.1～1.5 times than that of the ordinary steel T-stub connection, and 1.8～2.5 times than that of the dog bone connection; 2) the ductility of the new-type steel T-stub connections are 1.2～1.5 times than that of the ordinary steel T-stub connection, and 2.2～2.6 times than that of the dog bone connection; 3) the energy dissipating of the new-type steel T-stub connections are 1.7～2.1 times than that of the ordinary steel T-stub connection, and 6.3-8.0 times than that of the dog bone connection; 4) the new-type steel T-stub connections can improve the energy dissipating by friction sliding. The maximum friction energy dissipating can reach to 25% of the total energy dissipating of the new-type steel T-stub connections.(2) The finite element analysis results were consistent well with the experimental results. So the finite element models could be used for further study. Simulation results showed that:1) each T-stub bears more than half of the shear force within the beam end; 2) Existing technical standards can not calculate the prying force under the limit state.This paper proposed a formula to calculate the prying force and the prying force calculated by formula is 1.16 times than that achieved from FEM results.In conclusion, slotted hole on the web of T-stub can improve the ductility and energy dissipating of the steel T-stub connection significantly. The ductility and energy dissipating can be controlled by the size of slotted hole. The new-type steel T-stub connections proposed in this paper can provide new ideas for the structure of the seismic performance-based design.更多还原