波纹摩擦阻尼器的有限元分析及试验研究

发布时间：2019-02-09 15:30

【摘要】：随着上世纪七十年代结构被动控制被提出以后,在土木工程领域这一理论得到了广泛的应用与研究,其中摩擦阻尼器是比较常用的消能减震装置,但是其也有着自身的局限性。这主要体现在:(1)在地震作用下摩擦阻尼器可以很好的吸收地震作用传递到上部结构的能量但是其的工作时间比较短;(2)普通的摩擦阻尼器只能在地震作用时工作。面对这两个问题,本文从第一个不足点入手,提出了在有限的被破坏时间内如何去吸收更多的能量这一思路,并研制了波纹摩擦阻尼器。本文在摩擦阻尼器的理论基础上,对波纹摩擦阻尼器进行了有限元分析及实验研究:(1)研究设计了新型波纹摩擦阻尼器的构件组成及相应的尺寸大小,并在假设条件下根据材料力学及库仑力公式进行了位移与波纹摩擦阻尼器出力性能的关系公式推导,根据公式提出了相关的影响因子。(2)通过相关试验得到波纹摩擦阻尼器在一定条件下的滞回曲线,发现其面积很大说明耗能性能出众,但是滞回曲线的四周具有不稳定的波纹形状,同时试验发现,其耗能性能随着提供的螺栓的预紧力的增大而增大,但是不是线性关系。(3)应用ABAQUS对波纹摩擦阻尼器与光滑摩擦阻尼器进行建模和有限元分析,因为模型的复杂性,采用了等效摩擦系数置换的方法,用光滑摩擦阻尼器的有限元模型定义了三角形锯齿边长为0.75mm波纹摩擦阻尼器的有限元模型。(4)将等效的摩擦系数输入到MIDAS建立的框架模型中,对其加载Elcenth天然波,通过对比正常框架结构及装有光滑摩擦阻尼器的框架结构的层最大位移层间角,获得波纹摩擦阻尼器的抗震性能。研究结果表明,波纹摩擦阻尼器有着比较好的出力性能,相对饱满的滞回曲线,同时有限元分析中有着比较好的抗震性能。
[Abstract]:Since the passive control of structures was put forward in 1970s, the theory has been widely applied and studied in the field of civil engineering, among which friction dampers are more commonly used as energy dissipation devices, but they also have their own limitations. The main results are as follows: (1) friction dampers can absorb the energy transferred from earthquake to superstructure but their working time is short; (2) ordinary friction dampers can only work under earthquake action. In the face of these two problems, this paper starts with the first deficiency point, puts forward the idea of how to absorb more energy in the limited time of being destroyed, and develops a corrugated friction damper. Based on the theory of friction damper, the finite element analysis and experimental study of corrugated friction damper are carried out in this paper. (1) the component composition and the corresponding size of the new corrugated friction damper are studied and designed. Based on the material mechanics and Coulomb force formula, the relationship between displacement and the output force performance of corrugated friction dampers is deduced. According to the formula, the influence factors are put forward. (2) the hysteretic curves of corrugated friction dampers under certain conditions are obtained through correlation tests, and it is found that the large area of the dampers shows that the energy dissipation performance is outstanding. However, the hysteretic curve has unstable corrugated shape around it, and it is found that the energy dissipation performance increases with the increase of the pre-tightening force of the supplied bolt. But it is not a linear relationship. (3) the corrugated friction dampers and smooth friction dampers are modeled and analyzed by ABAQUS. Because of the complexity of the model, the equivalent friction coefficient replacement method is used. Using the finite element model of smooth friction damper, the finite element model with triangular sawtooth length as 0.75mm corrugated friction damper is defined. (4) the equivalent friction coefficient is input into the frame model established by MIDAS and the natural Elcenth wave is loaded on it. The seismic behavior of corrugated friction dampers is obtained by comparing the maximum displacement interlayer angles between normal frame structures and frame structures with smooth friction dampers. The results show that the corrugated friction dampers have better force performance, relatively full hysteretic curves and better seismic performance in finite element analysis.
【学位授予单位】：长春工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.1

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