考虑应变硬化的软钢阻尼器滞回模型及应用  

Hysteretic Modeling of Steel Dampers Considering Strain Hardening and Its Application

作　　者：朱奇云[1] 吕西林[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2017年第6期65-73,共9页Structural Engineers

基　　金：国家自然科学基金重大国际合作项目(51261120377)

摘　　要：设计了一种钢板开设条形孔的软钢阻尼器用于既有混凝土框架的减震加固,该阻尼器主要利用竖向板肢的平面内弯曲塑性变形提供耗能。首先通过低周反复加载试验研究了该软钢阻尼器的滞回性能,揭示了该软钢阻尼器具有滞回稳定、循环加载下应变硬化明显等特点。为建立考虑应变硬化效应的软钢阻尼器滞回模型,提出了采用Bouc-Wen材料与硬化材料并联的力学模型用于模拟软钢阻尼器的滞回性能,并在Open SEES程序实现其数值建模,编制了MATLAB计算程序用于确定滞回模型参数,数值模拟滞回曲线与试验结果匹配较好,该滞回模型能用于减震框架模型的非线性动力反应分析。给出了采用上述程序预测振动台试验软钢阻尼器滞回响应的应用算例。A steel damper with slits cut from the steel plate was designed for seismic retrofitting of an existing concrete frame. Energy is mainly dissipated through in-plane flexural inelastic deformation of vertical strips. Hysteretic behavior of the steel damper was investigated experimentally by low cycle loading test, indicating that the steel damper exhibits stable hysteresis and significant strain-hardening under loading reversals. In order to establish a hysteritic model of the steel damper considering the strain-hardening effect, a parallel model composed of Bouc-Wen material and hardening material was proposed for interpreting the hysteretic behavior of the steel damper, and analytical modeling was implemented by using OpenSEES program, a procedure was developed based on MATLAB program for determining parameters of the hysteretic model. The accuracy was demonstrated by comparing hysteretic curves obtained from numerical simulation and test results, respectively. The proposed parallel model can readily be incorporated into inelastic dynamic response analysis of a frame equipped with the steel damper. The procedure was also applied to prediction of hysteretic response of the steel dampers during a shaking table test.

关 键 词：软钢阻尼器 应变硬化 滞回模型 BOUC-WEN模型 OpenSEES程序 

分 类 号：TU352.1[建筑科学—结构工程]