考虑弹塑性结构退化和捏拢滑移效应的光滑滞回模型  

A Smooth Hysteretic Model Considering Degrading and Slip Pinching Effects of Inelastic Structures

作　　者：赵冠远[1] 安明喆[1] 季文玉[1] 王艳[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《中国铁道科学》2011年第3期52-57,共6页China Railway Science

基　　金：国家自然科学基金资助项目(50778017)

摘　　要：基于Bouc-Wen微分滞回模型,提出考虑弹塑性结构刚度退化、强度退化和捏拢滑移效应的光滑滞回模型。在该滞回模型中,弹塑性结构滞回反应的刚度退化程度由与加载历史上最大位移延性相关的参数控制,强度退化规律通过引入基于变形和滞回耗能双参数指标的损伤指数描述,捏拢滑移特征通过增加滑移—锁定单元模拟。滞回模型的控制参数为9个,一般只需调整其中与刚度退化、强度退化和捏拢滑移特征相关的6个参数便可模拟多种形状的滞回曲线。应用该滞回模型对弯曲破坏型和剪切破坏型钢筋混凝土柱抗震试验进行数值仿真,结果表明该滞回模型可较好地模拟不同破坏模式钢筋混凝土构件的滞回曲线。Based on Boue-Wen differential hysteretic model, an improved smooth hysteretie model which can take account of stiffness degradation, strength decay and slip pinching effects of inelastic structures is proposed. In the proposed model, the stiffness degrading rate is controlled by parameters associated with the maximum displacement ductility attained in the cyclic loading history. The damage index based on dis- placement and dissipation energy is adopted to describe strength decay of the inelastic structure. By intro- ducing the slip-lock element, the pinching characteristic is included in the model. Nine control parameters are used to control the hysteresis loop shape in the proposed model, but it is possible to generate a large variety of different shapes of the hysteresis loops through modifying suitably only six of them associated with stiffness degradation, strength decay and slip pinching characteristics. The proposed hysteretic model is used to simulate the seismic tests of reinforced concrete columns characterized by bending failure and shear failure modes. It is found that the model can simulate the hysteresis loops of reinforced concrete members with different failure modes well.

关 键 词：钢筋混凝土 弹塑性结构 刚度退化 强度退化 捏拢滑移 滞回模型 抗震分析 

分 类 号：TU313[建筑科学—结构工程]