自复位摩擦耗能支撑钢框架结构抗震性能的数值分析

Numerical simulation of the seismic behavior of steel frame with self-centering friction energy dissipative brace

自复位摩擦耗能(SCFED)支撑可以经历较大的变形,耗散地震动能,并且具有自复位功能,减少结构残余变形,因而得到广泛应用。为了研究SCFED支撑框架的抗震性能,用SAP2000多段线性连接单元和Wen塑性单元分别模拟复位系统和耗能系统的力学性能,二者并联模拟SCFED支撑力学性能,比对实验结果验证模型后,对6层FEDB和SCFEDB两种钢框架进行了地震作用下的动力响应分析,通过调整地震波的峰值,考虑了小震FOE、中震DBE和大震MCE下的结构抗震性能,分析结果表明文中的数值模拟模型分析结果和试验基本吻合,可以研究SCFED支撑框架抗震性能。与FEDB框架相比,SCFEDB框架可以减小结构的最大层间位移和残余位移,减少了与结构构件刚性连接的非结构构件的损伤,提高了结构的韧性。

A self-centering friction energy dissipative(SCFED)brace that can undergo large axial deformations without structural damage while providing stable energy dissipation capacity and a restoring force has recently been developed.In order to study the seismic behavior of steel frame with self-centering friction energy dissipative brace,this paper presents a numerical simulation SCFED brace by software SAP2000,in which a multi-linear elastic link element was selected to simulate the self-centering system(SCs),and a plastic(Wen)element was used to predicting the behavior of friction energy dissipative system(FEDs).Analysis results obtained by using the proposed numerical model are compared with the test results.Based on the model,pushover and nonlinear dynamic analysis of a six-story steel frame was carried out.Three suites of earthquake ground motions,which represent the frequent design and strong basis earthquakes,were considered in the seismic analysis.The seismic analysis results show that the SCFED brace can enhance structural performance.