轴压PVC-FRP管混凝土柱破坏机理研究  

STUDY ON FAILURE MECHANISM OF PVC-FRP CONFINED CONCRETE COLUMN SUBJECTED TO AXIAL COMPRESSION

作　　者：于峰[1,2] 牛荻涛[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]安徽工业大学建筑工程学院,马鞍山243002

出　　处：《玻璃钢／复合材料》2014年第11期21-25,共5页Fiber Reinforced Plastics/Composites

基　　金：国家自然科学基金(50725824;51008001);安徽省自然科学基金(1208085QE88);西部建筑科技国家重点实验室(筹)开放研究基金资助(10KF03);住房和城乡建设部科学技术项目(K4201222);马鞍山市科学技术项目(马科2012(6))

摘　　要：通过12根轴心受压PVC-FRP管混凝土柱试验,分析PVC-FRP管混凝土柱的破坏形态与破坏机理,将荷载作用下PVC-FRP管混凝土柱受力过程分为三个阶段:弹性阶段、弹塑性阶段以及强化阶段。根据PVC-FRP管混凝土柱中核心混凝土、PVC管和CFRP条带三种材料的受力特点,将核心混凝土受力过程分为混凝土开裂前、混凝土开裂后和内力重分布三个阶段;将PVC管分为弹性阶段和弹塑性阶段;CFRP条带一直处于弹性阶段。在试验研究基础上,分别给出PVC管、核心混凝土、CFRP条带的应力路径。根据极限平衡条件,提出PVC-FRP管混凝土柱承载力简化计算方法。According to the experimental study on 12 PVC-FRP confined concrete columns subjected to axial compression,the failure mode and failure mechanism of PVC-FRP confined concrete column are analyzed.The loading process of PVC-FRP confined concrete column may be divided into three sections：the elastic,the elasticplastic and strengthening stage.Based on the material characteristics of PVC tube,core concrete and CFRP strips,the confining procedure of core concrete may be divided into three stages：preceding the crack of concrete,after the crack of concrete and the internal force redistribution.PVC tube includes the elastic and elastic-plastic stage;the stress and strain of CFRP strips are in increasing condition;the stress paths of PVC tube,core concrete and CFRP strips are presented on the basis of experimental study.The simplified calculating method of bearing capacity of PVC-FRP confined concrete column is also proposed by the condition of limit equilibrium.

关 键 词：PVC-FRP管 混凝土柱 承载力 破坏机理 约束 

分 类 号：TB332[一般工业技术—材料科学与工程] TU375.1[建筑科学—结构工程]