连柱钢框架结构抗震性能研究

发布时间：2019-03-07 09:34

【摘要】：连柱钢框架结构是一种典型的损伤控制结构,通过耗能连梁连接钢框架毗邻双柱构成。在地震作用下连柱系统的耗能连梁率先进入塑性耗散能量,仅当变形过大时框架梁、柱等非耗能构件才会发展塑性,结构具有显著的屈服时序。本文应用ABAQUS有限元分析软件对连柱钢框架结构进行抗震性能分析,对框架跨度、高度、钢材强度等级及耗能连梁长度如何影响结构的抗震性能提出建议,并给出了耗能连梁可替换层间位移角的合理范围。本文主要完成了以下工作:(1)参考相关规范和文献,应用SAP2000软件设计了1栋4×6跨共6层的连柱钢框架结构,并从中取出一榀下部2层结构作为有限元分析的BASE试件。(2)应用有限元分析软件ABAQUS建立BASE试件模型,并通过对已有相关试验的模拟分析,验证本文建模方法的合理性。(3)从滞回曲线、骨架曲线、刚度退化曲线和累积滞回耗能等方面对BASE试件的抗震性能进行分析,并与耗能连梁采用传统焊接连接的LJ试件进行比较,结果表明:只要耗能连梁的连接具有一定的强度和刚度,BASE试件与LJ试件具有相同的抗震性能。(4)采用有限元分析软件ABAQUS考察框架层高、框架跨度、框架钢材强度等级以及耗能连梁长度对连柱钢框架整体结构抗震性能的影响,结果表明:跨度对结构整体滞回性能影响较小,层高对结构整体耗能性能影响较大;剪切屈服型耗能连梁更适用于连柱钢框架结构;随着框架钢材强度等级的提高,结构的耗能机制更加合理。(5)利用简化的三折线模型并结合连柱钢框架结构损伤的特点,考虑钢框架的层高、钢框架的跨度、框架钢材强度等级以及耗能连梁的长度的影响,给出了连柱钢框架结构耗能连梁可替换层间位移角的合理范围。
[Abstract]:The continuous-column steel frame structure is a typical damage control structure, which is formed by connecting a steel frame with a steel frame by an energy-consuming connecting beam. In the earthquake action, the energy-consuming connecting beam of the continuous column system is the first to enter the plastic dissipation energy, and the non-energy-consuming components such as the frame beam and the column can develop plasticity only when the deformation is too large, and the structure has a remarkable yield time sequence. This paper applies ABAQUS finite element analysis software to analyze the seismic performance of the continuous-column steel frame structure, and puts forward some suggestions on how the frame span, height, strength grade of steel and the length of the energy-consuming connecting beam affect the seismic performance of the structure, and gives the reasonable range of the alternative interlayer displacement angle of the energy-consuming connecting beam. In this paper, the following work is done: (1) With reference to the relevant specifications and the literature, the structure of a 4-6-span 6-layer continuous-column steel frame structure is designed by using SAP2000, and a structure of the lower layer 2 is taken out as the base-piece of the finite element analysis. (2) Using the finite element analysis software, ABAQUS to establish the base test piece model, and through the simulation analysis of the existing correlation test, the rationality of the modeling method is verified. (3) The anti-seismic performance of the BASE test piece is analyzed from the aspects of the hysteresis curve, the skeleton curve, the stiffness degradation curve and the accumulated hysteretic energy consumption, and compared with the LJ test piece with the traditional welding connection with the energy-consuming connecting beam, and the results show that: As long as the connection of the energy-consuming connecting beam has certain strength and rigidity, the BASE test piece has the same anti-seismic performance as the LJ test piece. (4) Using the finite element analysis software, ABAQUS, the effect of the frame height, the frame span, the strength grade of the frame steel and the length of the energy-consuming connecting beam on the seismic performance of the whole structure of the continuous-column steel frame is investigated. The results show that the effect of the span on the overall hysteretic behavior of the structure is small. The influence of the height on the overall energy dissipation performance of the structure is great; the shear yield-type energy-consuming connecting beam is more suitable for the frame structure of the continuous-column steel; with the improvement of the strength grade of the steel frame steel, the energy-consuming mechanism of the structure is more reasonable. (5) using the simplified three-fold line model and combining the characteristics of the damage of the continuous-column steel frame structure, taking into consideration the influence of the height of the steel frame, the span of the steel frame, the strength grade of the frame steel and the length of the energy-consuming connecting beam, The reasonable range of the inter-layer displacement angle of the continuous-column steel frame structure energy-consuming connecting beam is given.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU391

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