软钢阻尼器的滞回性能研究

发布时间：2018-04-24 11:23

本文选题：软钢阻尼器 + 屈曲约束支撑　；参考：《北京交通大学》2013年硕士论文

【摘要】：随着耗能减震结构在我国得到越来越多的重视,作为消能减震装置的软钢阻尼器由于其稳定的承载能力,良好的耗能性能等优点在我国得到广泛应用。本文研究的软钢阻尼器主要指屈曲约束支撑和开孔式加劲阻尼器。目前关于屈曲约束支撑的理论多出自于特定情形下的往复加载试验、采用线性随动强化模型的有限元分析和相关理论分析；而关于开孔式加劲阻尼器的理论则出自于极少数的几个实验和基于理想情形下的理论分析。本文即是关于这两种软钢阻尼器在有限元分析和理论分析上的进一步完善。本文主要研究内容如下： (1)对屈曲约束支撑的合理构成进行了理论分析,研究了约束比、初始缺陷、外套筒弹性模量、连接段宽厚比、厚度向和宽度向间隙对其整体稳定性、局部稳定性和滞回性能等的影响。并通过一组屈曲约束支撑试验,初步验证了理论分析的正确性。 (2)将采用线性随动强化模型、混合强化模型的有限元结果与试验结果对比：混合强化模型能实现有限元结果与试验结果的完美近似。对影响其滞回性能的相关因素(约束比、间隙、摩擦系数、集中因子等)做基于混合强化模型的有限元参数分析,得出了一些具有重要意义的结论。 (3)对一组试验情形下的开孔式加劲阻尼器做有限元模拟：混合强化模型依然是实现有限元结果与试验结果完美近似的最佳选择。用同一个有限元模型做工程情形下的分析发现,开孔式加劲阻尼器的端部连接条件对其滞回性能的影响很大：两端固定情形下,阻尼器在水平变形较大时存在轴向拉压破坏效应。一端固定,一端竖向位移释放情形下,阻尼器具有稳定的承载能力和良好的耗能能力。 (4)结合有限元分析成果,对工程情形下的开孔式加劲阻尼器做深层次的理论分析,得到了不同边界情形下的阻尼器力学性能(屈服力、屈服位移等)与其尺寸、材料参数间的关系。通过另一组菱形开孔式加劲阻尼器试验及有限元模拟分析,对前节理论分析的准确性和合理性进行了充分验证。
[Abstract]:With more and more attention being paid to the energy dissipation structure in China, the soft steel damper, which is used as an energy dissipation device, has been widely used in China because of its stable bearing capacity and good energy dissipation performance. The soft steel dampers studied in this paper mainly refer to buckling restrained braces and open-hole stiffening dampers. At present, most of the theories about buckling restrained braces are derived from reciprocating loading tests under specific conditions. The finite element analysis and related theoretical analysis of the linear follow-up strengthening model are adopted. The theory of open-hole stiffener is derived from a few experiments and theoretical analysis under ideal conditions. This paper is about the further improvement of finite element analysis and theoretical analysis of these two kinds of mild steel dampers. The main contents of this paper are as follows: In this paper, the rational composition of buckling restrained braces is analyzed theoretically, and the stability of buckling braces is studied, including the constraint ratio, initial defect, elastic modulus of outer sleeve, width to thickness ratio, thickness and width clearance. Effects of local stability and hysteretic properties. Through a group of buckling constraint bracing tests, the correctness of the theoretical analysis is preliminarily verified. The finite element results of the mixed strengthening model are compared with the experimental results: the hybrid strengthening model can achieve the perfect approximation between the finite element results and the experimental results. Based on the finite element analysis based on the mixed strengthening model, some important conclusions are obtained by analyzing the relevant factors (constraint ratio, clearance, friction coefficient, concentration factor, etc.) that affect its hysteretic performance. 3) finite element simulation of a group of open-hole stiffening dampers: the hybrid strengthening model is still the best choice to achieve the perfect approximation between the finite element results and the experimental results. By using the same finite element model for engineering analysis, it is found that the end connection condition of the open-hole stiffening damper has a great influence on its hysteretic performance: in the case of fixed ends, When the horizontal deformation of the damper is large, the axial tension and compression failure effect exists. In the case of fixed one end and vertical displacement release at one end, the damper has stable bearing capacity and good energy dissipation capacity. (4) combined with the results of finite element analysis, the mechanical properties (yield force, yield displacement, etc.) and the size of the dampers under different boundary conditions are obtained by deep theoretical analysis of the open-hole stiffening dampers under engineering conditions. The relationship between material parameters. The accuracy and rationality of the theoretical analysis of the front section are fully verified by another set of rhombic open-hole stiffening dampers and finite element simulation analysis.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.1

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