形状记忆合金阻尼器在斜拉桥上的减震性能研究

发布时间：2018-05-20 18:08

本文选题：形状记忆合金阻尼器(SMA阻尼器) + 斜拉桥　；参考：《长安大学》2015年硕士论文

【摘要】：形状记忆合金阻尼器(SMA阻尼器)是近些年发展起来的结构减震控制装置,这种装置可以有效的减小结构在地震作用下的响应,使结构获得良好的减震性能。采用半漂浮体系的斜拉桥允许桥梁结构在纵桥向发生移动,这种特点有利于结构减震,但是会使结构产生比较大的位移,因此需要在斜拉桥上安装减震控制装置。本论文以一座斜拉桥为工程实例背景,运用有限元软件ANSYS分析研究选用不同的地震波对斜拉桥关键部位地震响应的影响、安装SMA阻尼器对斜拉桥地震响应的改善以及不同条件的SMA阻尼器对斜拉桥减震性能的影响。本文主要内容如下所示:(1)研究了形状记忆合金材料的力学特性、本构关系,为有限元软件的模拟提供依据。(2)研究了结构的动力计算方法,经过对比分析选用时程分析法进行地震响应分析。(3)阐述了建立斜拉桥有限元模型的方法和选取地震波的原则,比较选用不同的地震波对斜拉桥关键部位地震响应的影响。比较SMA阻尼器安装前后斜拉桥关键部位的地震响应变化。(4)比较SMA阻尼器在不同的安装数量、不同的安装位置和不同的等效刚度三种情况下,对斜拉桥减震性能的影响。结果表明:选用不同地震波时斜拉桥关键部位的地震响应会有很大的差别;地震作用下SMA阻尼器能够显著地减小斜拉桥主梁梁端纵向位移、主塔塔顶纵向位移和主塔塔底弯矩;斜拉桥采用不同数量、不同安装位置和不同等效刚度的SMA阻尼器都会影响结构的减震性能。
[Abstract]:Shape memory alloy damper (SMA) is a structural shock absorber and control device developed in recent years. This device can effectively reduce the response of the structure under earthquake and make the structure obtain good seismic performance. The cable-stayed bridge with semi-floating system allows the bridge structure to move in the longitudinal direction. This feature is advantageous to the vibration absorption of the structure, but it will cause a large displacement of the structure, so it is necessary to install the shock absorber control device on the cable-stayed bridge. In this paper, a cable-stayed bridge is used as an engineering example, and the influence of different seismic waves on the seismic response of the key part of the cable-stayed bridge is studied by using the finite element software ANSYS. The improvement of seismic response of cable-stayed bridges with SMA dampers and the influence of SMA dampers under different conditions on the seismic performance of cable-stayed bridges. The main contents of this paper are as follows: (1) the mechanical properties and constitutive relations of shape memory alloy materials are studied, which provides a basis for the simulation of finite element software. The method of establishing the finite element model of cable-stayed bridge and the principle of selecting seismic wave are expounded, and the influence of different seismic waves on the seismic response of the key part of cable-stayed bridge is compared. The effects of SMA dampers on the seismic performance of cable-stayed bridges under three conditions of different installation quantity, different installation position and different equivalent stiffness are compared. The results show that the seismic response of the cable-stayed bridge will be very different when different seismic waves are selected, and the SMA damper can significantly reduce the longitudinal displacement of the girder end, the longitudinal displacement of the top of the main tower and the bending moment of the bottom of the main tower of the cable-stayed bridge under seismic action. The vibration absorption performance of cable-stayed bridge is affected by different number of SMA dampers with different installation positions and different equivalent stiffness.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27;U441.3

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