狗骨—蜂窝式梁柱节点性能有限元分析

发布时间：2018-05-08 21:46

本文选题：狗骨—蜂窝式节点 + 焊接残余应力　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：高层钢结构建筑中梁柱节点的合理形式对结构抗震性能来说起很重要的作用。在日本的阪神地震和美国的北岭地震之后,陆续出现了众多抗震性能良好的节点形式,包括削弱型节点和加强型节点两大类,而在削弱型节点中狗骨式节点研究较多,应用也较多。狗骨式节点在受力过程中,在狗骨部位首先形成塑性铰,从而保护节点免受脆性破坏,实现了“强节点,弱构件”的设计思想,近年来被广泛应用到钢结构框架中。蜂窝梁又是钢结构工程中兴起的一种结构形式,即按照一定的扩高比将梁腹板沿设计好的路径切割,然后错位对接,形成腹板带有孔洞的蜂窝梁,或者直接在实腹梁腹板上开孔。蜂窝梁以其造型美观、节省材料和提高承载力等优点同样受到钢结构工程师和社会人士的青睐。本文将两者相结合,形成狗骨—蜂窝式节点,研究其在静力和动力荷载作用下的受力性能,对该种节点的推广和应用有重要意义,同时为我国制定相关设计标准及进一步研究提供参考依据。本文通过有限元分析的方法,对模型进行了全面仿真模拟,包括热—结构耦合场模拟、螺栓预紧模拟、接触模拟和节点静力、动力模拟,涉及了材料非线性、几何非线性和状态非线性。首先,利用间接耦合法进行了狗骨—蜂窝式节点焊接残余应力的研究,包括温度场和应力场的计算与分析；其次,在以上基础上研究焊接残余应力对节点静力性能的影响；然后在忽略焊接残余应力的情况下,对比研究狗骨式节点、蜂窝式节点、狗骨—蜂窝式Ⅰ型节点和狗骨—蜂窝式Ⅱ型节点在梁端单调位移荷载作用下的静力性能和循环反复位移荷载作用下的动力性能。综合分析有限元计算结果,可以得出狗骨—蜂窝式节点与狗骨式节点比较,在材料用量减少的情况下,节点承载力和刚度无明显降低,延性反而提高,同时保留了蜂窝梁造型美观、便于穿越管线的优点。研究中,还重点分析了焊接残余应力的形成过程以及在梁端加载过程中焊缝区域、剪切板接触和螺栓预紧力的变化,进一步突出了狗骨—蜂窝式节点的优势。
[Abstract]:The reasonable form of beam column joints in high rise steel structures plays an important role in the seismic performance of the structure. After the Kobe earthquake in Japan and the Beilin earthquake in the United States, there have been numerous nodal forms in succession, including two types of weakened joints and reinforced joints, and the dog bone nodes in the weakened joints. In the process of stress, the dog bone type joints first form plastic hinge at the part of the dog bone to protect the node from the brittle failure, and realize the design idea of "strong node and weak component". In recent years, it has been widely applied to the steel structure frame. The honeycomb beam is also a kind of structural form in the steel structure, that is, the structure of the steel structure. In accordance with a certain height ratio, the beam web is cut along the designed path, then misplaced and butted, forming a honeycomb beam with holes in the web, or opening the hole directly on the web of the real abdomen beam. The honeycomb beam is also favored by the steel knot engineers and the social personages for its beautiful shape, material saving and the improvement of the bearing capacity. In combination, the dog bone honeycomb joints are formed to study the force performance of the joints under static and dynamic loads. It is of great significance to the popularization and application of this kind of node. At the same time, it provides reference for the formulation of relevant design standards and further research in China. This paper has carried out a comprehensive simulation of the model through the method of finite element analysis. It includes thermal structure coupling field simulation, bolt pretightening simulation, contact simulation and node static, dynamic simulation, involving material nonlinearity, geometric nonlinearity and state nonlinearity. First, the study of residual stress in the welding of dog bone honeycomb joints is carried out by indirect coupling method, including the calculation and analysis of temperature field and stress field; secondly, The effect of welding residual stress on the static behavior of joints is studied on the basis of the above basis. Then, under the condition of neglecting the residual stress of the welding, the static performance and cyclic reverse reduction of the dog bone, honeycomb, dog bone honeycomb type I and the dog bone honeycomb type II joints under the beam end are compared. A comprehensive analysis of the results of the finite element analysis can be made to compare the results of the finite element analysis. It can be obtained that the dog bone honeycomb node and the dog bone type node are compared. In the case of reduced material consumption, the bearing capacity and stiffness of the joints are not obviously reduced and the ductility is improved, and the advantages of the beautiful shape of the honeycomb beam and the advantages of passing through the pipeline are retained. In the study, The formation process of welding residual stress and the change of the weld area, the shear plate contact and the bolt pretightening force during the loading process of the beam end are also emphatically analyzed, and the advantages of the dog bone honeycomb joints are further highlighted.

【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU973.13

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