SMA阻尼器—隅撑支撑对框架结构被动控制的理论研究

发布时间：2018-04-20 16:06

本文选题：SMA阻尼器 + 隅撑支撑框架　；参考：《河北工业大学》2015年硕士论文

【摘要】：隅撑支撑是一种新型结构形式,具体表现为在小震作用下为结构提供抗侧移刚度,在大震作用下隅撑发生屈服进行耗能。超弹性形状记忆合金是一种新型智能材料具有大变形恢复功能,还具有较高的阻尼性能、抗疲劳性和耐久性。本文将SMA阻尼器与隅撑支撑相结合,制成耗能装置以实现对框架结构的振动控制。本文的主要内容如下:(1)利用SMA的超弹特性设计一种新型的SMA阻尼器,对其结构构造和工作原理进行了详细说明,该阻尼器的优点为:对阻尼器拉力或者压力时,内部所有的SMA丝始终处于拉伸状态;对SMA的最大应变可以控制。(2)将SMA阻尼器与隅撑支撑结合在一起,构成结构的双重耗能防线,即:中小震时,SMA阻尼器进行耗能;遇到强震时,隅撑构件主要进行耗能。(3)基于ABAQUS平台运用UMAT子程序对SMA本构模型进行二次开发,建立了SMA力学模型,在此基础上建立SMA阻尼器-隅撑支撑框架结构在地震作用下的计算模型。(4)以一十五层和一三层框架为算例,分别计算了SMA阻尼器隅撑支撑结构在地震作用下的振动响应和震后结构自复位情况,结果表明:该耗能体系可以有效地抑制层间位移和水平位移,并可以驱使结构在震后基本复位,但是对加速度有一定的提高。
[Abstract]:Corner brace is a new type of structure, which can provide lateral stiffness for the structure under the action of small earthquake, and yield to consume energy under the action of strong earthquake. Superelastic shape memory alloy (SMA) is a new type of smart material with large deformation recovery, high damping property, fatigue resistance and durability. In this paper, the SMA damper is combined with the corner brace, and the energy dissipation device is made to control the vibration of the frame structure. The main contents of this paper are as follows: (1) A new type of SMA damper is designed by using the superelastic characteristics of SMA. The structure and working principle of the damper are described in detail. The advantages of the damper are as follows: when the damper is under tension or pressure, All the internal SMA wires are always in the tensile state; the maximum strain of the SMA can be controlled. 2) the SMA dampers are combined with the corner braces to form the dual energy dissipation line of the structure, that is, when the small and medium earthquakes occur, the dampers consume the energy; when the strong earthquakes occur, the dampers consume energy. Based on the ABAQUS platform, the SMA constitutive model is developed by using UMAT subroutine, and the SMA mechanics model is established. On the basis of this, the calculation model of SMA damper-corner braced frame structure under earthquake action is established. (4) taking 15 story frame and one three story frame as examples, The vibration response of the SMA damper bracing structure under earthquake and the self-reset of the structure after the earthquake are calculated, respectively. The results show that the energy dissipation system can effectively suppress the interlayer displacement and the horizontal displacement. It can drive the structure to reset basically after the earthquake, but it can improve the acceleration to a certain extent.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.1

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