PVC-FRP管混凝土柱组合抗压刚度理论分析  

Theoretical analysis on the composite compressive stiffness for PVC-FRP confined concrete column

作　　者：于峰[1] 徐国士[1] 程安春[1] 黎德光[1] 

机构地区：[1]安徽工业大学建筑工程学院,马鞍山243002

出　　处：《计算力学学报》2015年第1期107-112,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(51278403;51008001);安徽省自然科学基金(1208085QE88);住房和城乡建设部科学技术(K4201222)资助项目

摘　　要：为研究PVC-FRP管混凝土柱的组合抗压刚度,应用弹性力学中的位移变分原理,对PVC-FRP管混凝土柱进行小变形下的弹性理论分析。考虑PVC-FRP管和核心混凝土径向位移和纵向应变协调,分别推导出PVCFRP管和核心混凝土的抗压刚度以及PVC-FRP管对核心混凝土套箍系数的理论计算公式。在此基础上,建立PVC-FRP管混凝土柱组合抗压刚度计算理论。分析CFRP条带体积含纤维率,混凝土泊松比以及混凝土强度等级等因素对PVC-FRP管混凝土柱组合抗压刚度的影响规律。理论计算结果与试验值吻合较好。To study the composite compressive stiffness of PVC-FRP confined concrete column,by means of the displacement variation principle of elasticity,the elasticity theory analysis of infinitesimal deformation was performed for PVC-FRP confined reinforced concrete column. Based on the compatibility of radial displacement and longitudinal strain, theoretic formulas of the compressive stiffness of PVC-FRP tube and core concrete, the hooping mechanism coefficient of PVC-FRP tube to core concrete were gained. The composite compressive stiffness calculation theory of PVC-FRP confined concrete column was derived on this basis. The influence law of the CFRP strips volume-fiber ratio, core concrete Poisson＇s ratio and concrete strength on the composite compressive stiffness were discussed. The calculated values of the proposed formula agree well with the experimental results.

关 键 词：PVC-FRP管混凝土柱 组合抗压刚度 变分原理 套箍系数 体积含纤维率 泊松比 

分 类 号：TU398[建筑科学—结构工程]