【作者】 吴华英；

【导师】 彭少民；

【作者基本信息】 武汉理工大学 ， 结构工程， 2003， 硕士

【摘要】 随着科学技术和经济建设的大力发展，钢结构在现代建筑中的地位越来越重要。历次强烈地震表明，采用钢结构的建筑均具有良好的抗震性能。但传统的抗侧力体系不能经济合理的满足抗侧刚度和延性等抗震要求。 偏心支撑框架结合了中心支撑框架的强度、刚度高和普通抗弯框架的延性、耗能性能好的优点，通过耗能梁段的非弹性变形耗散大量输入结构的地震能量。它是一种改进了的新型抗侧力体系。因此，分析偏心支撑框架在地震作用下的响应以及提出改善耗能梁段的建议，不仅具有理论意义，而且具有很大的应用价值。 针对上述问题，本文完成了两榀1：2钢框架模型试验——中心支撑框架和偏心支撑框架。研究中心支撑框架和偏心支撑框架在低周往复荷载作用下的抗侧力性能，分析框架的刚度、强度、延性以及耗能能力等。在试验的基础上，讨论了中心支撑体系和偏心支撑体系各自的适用范围和受力特点，提出了中心支撑框架和偏心支撑框架的设计过程和方法。 本文还通过数值模拟对中心支撑框架和偏心支撑框架进行非线性分析，讨论各个受力阶段框架的应力分布情况，完善试验研究。耗能梁段能耗散90％的地震能量，是偏心支撑框架耗能的关键。因此，本文对耗能梁段进行进一步计算分析，概述耗能梁段对整体性能的影响，并利用有限元程序ANSYS对耗能梁段进行数值计算：针对耗能梁段的屈服类型建立5种不同长度的模型，计算讨论耗能梁段屈服类型的长度划分；针对耗能梁段腹板高厚比、翼缘宽厚比以及梁段截面形状等因素共建立了18种模型进行计算分析；针对加劲肋对耗能梁段的作用建立了4种模型，并结合已有的试验阐述了加劲肋对耗能梁段的影响。 最后，在总结全文工作的基础上，提出了本课题有待进一步的问题。更多还原

【Abstract】 Steel structures are playing more and more role in modern structure with technology and economy. All previous earthquake were indicated that steel frame structures have welL resistant-seismic behavior But due to traditional resistant-lateral systems, the resistant-lateral rigidity and ductility of steel structures can’t meet resistant-seismic demands.Eccentrically braced frames (EBFs) combines the strength and stiffness of concentrically braced frames (CBFs) with the inelastic behavior and energy dissipation of moment-resisting frames, especially inelastic deformation of link absorbs seismic energy. It is a kind of refined resistant-lateral system. So, the analysis about response and collapse mechanism of EBFs under seismic loading are not only significant in theoretical aspect, but also important in practice.Based on the questions that elaborated, two l:2-scale steel frame specimens are tested in this paper-EBFs and CBFs. Studied the resistant-lateral capability of EBFs and CBFs under cycle loading. Analyzed the stiffness , strength , ductility and dissipation of frame, etc. The performance and validity of CBFs and EBFs are evaluated and their design method and course is presented on the basis of the experimental research and analysis.Nonlinear analysis are conducted on CBFs and EBFs with numerical technology in this paper, discussed stress of frame under varial loading conditions. Link can dissipate 90 percent of seismic energy. It is the key of EBFs, therefore, furthermore calculation about link are carried out in this thesis, introduced achieved research, summarized the affect of link on whole capability in the first, the second, numerical calculation are proceeded on link with ANSYS: with the purpose of discussing yieldingmode critical length of link, established five different specimens; with the purpose of discussing the influence of h/tw of web, b/tf of flange and h/b, established eighteen different specimens; with the purpose of discussing the affect of stiffener, established four different specimens, and elaborated the affect of stiffener on link based on achieved test researches.Some problems about this research that ought be studied were put forward in the end of this thesis.更多还原