方形截面混凝土柱FRP约束下的轴向应力-应变曲线计算模型  

A MODEL FOR CALCULATING THE AXIAL STRESS-STRAIN CURVE OF SQUARE-SECTION CONCRETE COLUMN CONFINED BY FRP

作　　者：敬登虎[1] 曹双寅[1] 

机构地区：[1]东南大学,江苏南京210096

出　　处：《土木工程学报》2005年第12期32-37,共6页China Civil Engineering Journal

摘　　要：FRP约束方形混凝土柱可以提高其强度和延性,但提高幅度相对于圆形截面柱较小,主要由于截面形状以及FRP在方柱拐角处应力集中的影响。在国内外关于FRP约束方柱的试验研究基础上,对截面形状、约束强度和刚度、未约束混凝土强度、拐角应力集中等影响参数以及应力应变的荷载路径相关性进行分析。FRP约束时存在强弱之分,给出强约束临界点计算公式,并根据两种不同的约束情况分别提出新的两段线—抛物线、直线简化应力-应变曲线计算模型。该模型考虑上述影响参数,并与相关试验数据进行比较分析,结果表明简化的计算模型与试验数据吻合较好,其结构形式简单,参数取值较为方便。The strength and ductility of square concrete column confined by FRP can be improved, but the extent of improvement is diminished if compared with columns of circular sections, due to the stress concentration at square column comers. Based on many studies concerning square columns confined by FRP, the above parameters, the confining strength, the strength of unconfined concrete and the correlation between load path-dependence and stress-strain relationship are analyzed. The confinement of FRP shows strong and weak aspects, and the calculating formula for critical strong point is presented. The presented model is compared with experimental data, and the results show that the simplified calculating model of stress-strain has good agreement with experimental data.

关 键 词：FRP 方形混凝土柱 应力-应变 

分 类 号：TU375.3[建筑科学—结构工程]