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1、Classified Index：TU973.15U.D.C.: 693.79Dissertation for the Master Degree in Engineering.RESPONSE ANALYSE OFECCENTRICALLY BRACED STEELFRAMES UNDER SEISMIC LOADCandidate：Supervisor：Academic Degree Applied for：Specialty：Affiliation：Date of Oral Examination：University：Yin HaipengAssociate Prof . Tang A
2、ipingMaster of EngineeringStructure EngineeringSchool of Civil EngineeringJune,2006Harbin Institute of Technology哈尔滨工业大学工学硕士学位论文摘要偏心支撑钢框架体系在弹性阶段刚度很大，能够满足高层钢结构侧移要求。在罕遇地震时，由于消能梁段屈服进入塑性，结构有很强的耗能能力和延性，是适用于高烈度震区的一种有效的抗侧力结构体系。尽管该结构体系在实践中得到了应用，但其地震反应规律和抗震设计水平仍然存在一些不足，为系统揭示该结构体系的地震反应规律和为抗震设计提供良好的指导，本文研究了水平极
3、限荷载下设计参数对这种结构体系地震反应的影响规律及其在地震作用下的受力性能，为该类体系的抗震设计提供参考。首先，本文论述了偏心支撑钢框架在国内外发展的状况和这种结构的抗震设计原理，以及这种结构在实际的设计和应用中有关的规范规定和经验。然 后 ， 仿 照 试 验 建 模 ， 在 有 限 元 软 件 ANSYS 平 台 上 , 选 择 壳 体 单 元SHELL181 模拟组件对偏心支撑钢框架体系进行了试验建模，并将模拟结果与试验结果相比较以证明选用单元的合理性，最后对偏心支撑钢框架进行了水平荷载作用下的静力分析，研究不同消能梁段的长度、层高和跨度的比值、楼层数以及竖向荷载大小对结构的屈服荷载、极限
4、荷载的影响，并且得到了相应的变化规律。在对偏心支撑钢框架体系进行极限承载力的分析中，选用了与规范更贴近的破坏准则，经过对计算结果的总结和分析，得到了在实际的工程中控制梁段长度和结构高跨比等方面的建议。在上面工作的基础上，为了加快计算速度，利用梁单元 BEAM188 和杆单元 LINK8 建立了一个七层的偏心支撑钢框架结构的模型，考虑支撑与框架梁铰接和支撑与框架梁刚接两种不同的连接方式，并且根据偏心支撑框架的抗侧刚度远远大于纯框架的原理，对结构的计算进行相应的简化，选取二类场地上的三条不同地震波作为输入，对结构进行多遇地震和罕遇地震作用下的时程分析。计算结果表明，偏心支撑钢框架在多遇和罕遇地震波
5、作用下，消能梁段同时承受较大的弯矩和剪力，随着楼层的增高消能梁段的受力减小，只有中下层的梁段能够达到屈服和破坏。并且讨论了两种不同支撑和框架梁连接形式的优缺点，提出了合理的工程抗震设计对策和建议。本文的研究很好的揭示了偏心支撑钢框架在地震荷载的作用下结构的极-I-哈尔滨工业大学工学硕士学位论文限荷载随设计参数的变化规律，以及两种不同支撑与框架梁连接形式对结构抗震性能的影响。研究结果有助于提高该类结构体系抗震设计的水平。关键词钢框架结构；偏心支撑；抗震设计；消能梁段- II -哈尔滨工业大学工学硕士学位论文AbstractEccentrically braced steel frame is a
6、 lateral load-resisting system which is popularly applied in high earthquake hazard area, because of its high elastic stiffness to meet high-rise steel structure needs of drift requirement . With excellent energy-dissipation capacity and ductility, the links of eccentrically braced steel frames can
7、endure large inelastic deformation without loss of its strength even under great earthquake load. This paper focuses on studying how the ultimate load changes with parameters of design and the performance under seismic load .Firstly, the principle and development of aseismic design of eccentrically
8、braced steel frame structure system are commented, some rules of aseismic design and practical experiences for this kind of structural system are discussed.Secondly, by using of finite element analysis in the platform of ANSYS, a model of eccentrically braced steel frame is set up to simulate its re
9、sponse under earthquake load, the results are compared with that of test, and had proved that this model is reliable to simulate its response under earthquake load. Then, based on this model, several parameters of eccentrically braced steel frames under horizontal load are analyzed; these parameters
10、 include varied length of energy- dissipation beams segment, ratio of floor height to span length, number of floors and vertical load. The yield load and the ultimate load are sharply changed when length of energy-dissipation beams segment (0.1-0.16L,Lis the length of the frames beam) and ratio of f
11、loor height to span length(0.5-0.65) are modified in certain range, a more rational damage criterion than Code is adopted in computing the ultimate bearing capacity of eccentrically braced steel frame, some useful conclusions are generalized.Thirdly, on the base of the above works, a 7-floors eccent
12、rically braced steel frame structure is modeled with the elements BEAM188 and LINK8 in ANSYS. Two types of joints between braces and frame beams are considered: one is the- III -哈尔滨工业大学工学硕士学位论文hinge joint; the other is the rigid joint. Three earthquake records in siteare selected as the earthquake i
13、nput, the structure earthquake response under frequent earthquakes and rare earthquakes are respectively studied, the laws of inner force of constructional elements changing with time and design parameters are got. The following conclusions are got: energy-dissipation beams segment bears great momen
14、t and shear force; on lower floors, they will be yielded and damaged, but the others will not.Lastly, some conclusions are got. The result of finite element analysis in this dissertation is proved to have a good agreement with these results from the theoretical and experiment analysis, some proposal
15、s of aseismic design for eccentrically braced steel frame structure was presented, which the designers will benefit from them.KeywordsEccentrically Braced steel Frame Structure; Aseismic Design; beams segment with energy-dissipation- IV -哈尔滨工业大学工学硕士学位论文目录摘要 .I Abstract . III第 1 章 绪论 . 1 1.1 课题背景 . 1 1.2 偏心支撑钢框架体系研究进展 .
