【作者】 张强；

【导师】 苏明周；

【作者基本信息】 西安建筑科技大学 ， 建筑与土木工程， 2015， 硕士

【摘要】 近年来,桁架式转换层凭借其在建筑使用空间和结构抗震性能两方面的突出优势,正在逐步取代转换梁,成为高层建筑中广泛采用的结构转换形式。本文针对某高层框剪结构的叠层空腹钢桁架转换层,采用有限元分析软件对单榀叠层空腹钢桁架模型及桁架节点模型进行分析研究。分析结果可作为PMSAP软件设计结果的补充分析内容,分析结论可作为该工程的设计建议。在论文中,首先,介绍了选取叠层空腹钢桁架作为本工程结构转换方案的思路。其次,对转换桁架SAP2000模型进行了抗震性能分析,内容包括模态分析、竖向荷载作用下的静力分析、反应谱分析、弹性时程分析和弹塑性时程分析,针对大跨度叠层空腹钢桁架的动力特性、竖向刚度的强弱、地震作用下的内力分布规律以及罕遇地震作用下的破坏机制等工程问题进行研究。最后,对工程中东西塔叠层空腹钢桁架特定位置的节点,采用ABAQUS软件建立实体模型进行节点受力性能分析,将底层桁架弦杆、腹杆相贯而成节点类比成钢框架刚性梁柱连接节点,选用3组节点对比,探究了有效的节点构造加强措施,并确定了构造加强的范围。分析结果表明,本工程中的叠层空腹钢桁架转换层具有突出优势:正常使用状态下具备很大的竖向刚度;很大程度上减轻了转换结构的自重并削弱了转换层的侧向刚度,有效地减小了地震作用及其不利影响;在中震、大震作用下受力性能良好,桁架构件均达到了预期的设计性能目标;对桁架节点采取的腹杆翼缘加盖钢板并提高腹板厚度的构造加强措施,有助于改善节点的应力分布并提高其的承载力和刚度。论文基于以上研究成果,对叠层空腹钢桁架转换层和特定位置节点提出了设计、构造建议,可供类似工程参考。更多还原

【Abstract】 In recent years, the truss transfer system has gradually become the most widely used transfer system instead of beam transfer system for the advantage of its architectural function and seismic behavior.On the background of the multilayer vierendeel steel truss transfer system in a RC frame shear structure, structural behavior of the multilayer vierendeel steel truss and its key joints, combining with previous research results and engineering practice, are researched emphatically in this paper, and the results could be used as a supplement of implemented design calculation by software PMSAP.Main contents in this paper are as follows. Firstly, design ideas and principles of vierendeel steel truss transfer system are introduced. Secondly, by use of finite element analysis program SAP2000, response spectrum analysis and elastic-plastic time-history analysis are used to analyze multilayer vierendeel transfer truss simplified model in the project. Bearing capacity of truss members are checked under moderate earthquake. The yield order of member plastic hinge and failure law of vierendeel transfer truss are explored under severe earthquake. Finally, by use of finite element analysis program ABAQUS, structural behavior of vierendeel truss key joints are analyzed. According to the results, detail design measures of truss joints are concluded.As the consequences show that the advantages of multilayer vierendeel steel truss used as a transfer system in high-rise building are very outstanding. It has a larger vertical stiffness in normally utilized status. Compared with beam type transfer systems, multilayer vierendeel steel truss transfer system has effectively decreased earthquake action and adverse impact by cutting self-weight and lateral stiffness of transfer structure. Vierendeel truss shows an excellent structural behavior under moderate and severe earthquake and accomplishes different performance objectives. Detail design measures of truss joints, which weld steel cover-plates on flanges of truss web member, contribute to improve joint stress distribution as well as joint bearing capacity and stiffness.At last, based on the above research results, some design and detailing advices of the multilayer vierendeel steel truss transfer system are presented,to provide a reference for similar projects.更多还原