钢筋混凝土矩形空心墩柱的FRP约束效应研究  

STUDY ON THE FRP CONFINING EFFECT ON REINFORCED CONCRETE BRIDGE PIERS WITH RECTANGULAR HOLLOW SECTION

作　　者：刘柯[1,2] 董振华[1,3] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京市建筑工程研究院有限责任公司,北京100039 [3]交通运输部公路科学研究院公路交通研究中心,北京100088

出　　处：《玻璃钢／复合材料》2016年第4期12-20,共9页Fiber Reinforced Plastics/Composites

基　　金：国家重点基础研究发展计划项目(2011CB013602);国家自然科学基金资助项目(50938006;51178008);国家自然科学基金资助项目(51308028)

摘　　要：为了正确评价纤维增强复合材料(FRP)约束效应对钢筋混凝土(RC)空心墩柱受力性能的影响,首先采用有限元数值模拟方法,对FRP类型、厚度、幅宽和间距参数影响下约束RC矩形空心柱的轴压荷载、约束混凝土压应变、箍筋和FRP拉应变的变化规律进行研究。基于模拟结果,提出一种考虑FRP布环箍和箍筋共同约束效应的侧向约束压力计算公式,进而建立FRP约束混凝土压应力-应变模型。进一步应用提出的FRP约束混凝土模型评价FRP加固矩形空心桥墩的受力性能,并与试验结果对比,两者吻合较好。High-piers of hollow section have been constructed in numerous spectacular reinforced concrete（ RC） bridges,which can be an effective solution to maximize strength-mass and stiffness-mass ratios,and to reduce the weight contribution to the foundations and the mass contribution to the seismic response. Because of the wall thickness,ties or spirals reinforcements ratio,shear-span ratio,axial compression ratio et. al,the hollow RC piers designed in accordance with the old and existing codes were damaged in recent earthquakes due to insufficient flexural strength,shear strength or ductility. So in order to improve the seismic performance of the hollow bridge piers,the confinement effect on the behavior of RC bridge piers with fiber-reinforced polymer sheets（ FRP） should be accurately estimated based on the seismic confinement theory of columns. According to this achievements,the confined performance of columns is obviously improved,and it is influenced by factors of the types of FRP sheets,FRP sheets thickness,the width and the space of FRP strips. In this paper,the finite element numerical simulation method was applied firstly. It is to study the behavior of FRP confined RC hollow bridge piers,such as the development laws of axial compression force,confined concrete compressive strain,stirrup and FRP tension strain. Based on the above simulated results,a new formula of lateral pressure with the complex confinement effect of FRP strips and stirrups was proposed,and then it is used to the compressive stress-strain model of FRP confined concrete. The formed compressive stress-strain model was further used to estimate the behaviors of FRP confined RC bridge piers with rectangular hollow cross section. The simulated results show that the curvature ductility,displacement ductility,ultimate deformation,ultimate strength are improved significantly. Then the calculation results was compared with experimental results,and it shows that the simulated results have good agreement with experimental results.

关 键 词：纤维增强复合材料 约束效应 侧向约束压力 约束混凝土模型 空心墩柱 

分 类 号：TB332[一般工业技术—材料科学与工程] TU375.4[建筑科学—结构工程]