基于Open Sees的FRP加固RC圆柱拟静力实验数值分析  

Numerical Analysis for Pseudo-static Tests of FRP-confined RC Circular Columns Based on Open Sees

作　　者：丁辉 顾冬生[1] DING Hui;GU Dong-sheng(School of Environmental and Civil Engineering/Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122

出　　处：《山东农业大学学报（自然科学版）》2019年第2期216-220,共5页Journal of Shandong Agricultural University：Natural Science Edition

摘　　要：纤维增强塑料(Fiber Reinforced Polymer简称FRP)加固钢筋混凝土圆柱(Reinforced Concrete简称RC)提高其抗震性能得到广泛运用,模拟FRP加固钢筋混凝土圆柱动力荷载作用下的非线性滞回反应是桥梁抗震研究的重要内容。以6个FRP加固圆形钢筋混凝土桥墩柱的拟静力实验结果为依据,基于Open Sees中的非线性梁柱单元、零长度单元,建立了考虑弯曲变形、粘结滑移变形的桥墩柱抗震数值分析模型,同时考虑FRP及箍筋对混凝土的共同约束作用,选用吴刚强化模型作为混凝土强度依据,在对实验验证的基础上,进行参数分析。数值模拟结果与实验结果对比表明:吴刚强化模型计算的混凝土应力应变合理,纤维单元模型对加固柱的滞回曲线有较好的模拟,且能体现柱在加载过程中刚度、强度的变化,FRP加固量、轴压比、剪跨比对加固柱的承载力及破坏位移角有一定的影响。It has been widely used that fiber-reinforced polymer(FRP)jacketing of reinforced concrete(RC)columns is a very effective means to enhance the seismic performance,simulation of the hysteretic behavior of fiber-reinforced polymer(FRP)jacketing of reinforced concrete(RC)columns is an important issue for seismic design of bridges.Based on the pseudo-static tests of six fiber-reinforced polymer(FRP)jacketing of reinforced concrete columns,which are circular-section,the nonlinear beam-column element,zero-length element in Open Sees is applied to model flexural and bond-slip.Taking the effect of FRP and stirrups on the concrete into consideration,Wugang concrete constitutive models is selected as the the strength basis of concrete.Parametric analysis is attained on the basis of experimental verification.The comparison between the numerical simulation results and experimental results indicates that Wugang concrete constitutive models is reasonable,the fiber element model can accurately simulate hysteretic curves of the columns and also describe their stiffness strength degration in the process.The amount of FRP,the axial compression ratio and the shear span ratio affect the bearing capacity and the harmful drift angle of columns.

关 键 词：FRP加固钢筋混凝土圆柱 轴压比 OPEN SEES 纤维模型 

分 类 号：TU312[建筑科学—结构工程]