建筑结构学报2011，Vol.32Issue(4)：101-109,9.
CFRP中等约束钢筋混凝土方柱单轴受压应力-应变模型
Stress-strain model for CFRP moderately-confined reinforced concrete square columns
摘要
Abstract
In order to investigate the influence of longitudinal and hoop reinforcement, layers of carbon fiber-reinforced polymer (CFRP) jackets, size effect and predamage on the stress-strain relationship of CFRP-confined RC columns, 22 square RC columns confined with CFRP were tested under uniaxial compression.The specimens included two dimensions, 305mm ×305mm in cross section and 915mm in height, 204mm ×204mm in cross section and 612mm in height.Test results show that the longitudinal reinforcement mainly influences the peak stress and the hoop reinforcement strongly influences both the shape of stress-strain curve and the ultimate strain.The influence of inside reinforcement should not be ignored in the stress-strain model of square columns.RC square columns confined with external CFRP experienced significant increase in ductility, but slightly enhancement in strength.Most tested stress-strain curves are moderately-confined, in which a localized strain-softening behavior occurred.Size effect strongly influences the effective confinement of CFRP.The definition of lightly-confined or heavily-confined using proposed confinement ratio method is inapplicable.The predamage has small effect on the whole stress-strain curves, the peak stress and ultimate strain slightly decrease under large damage level in this test.Based on the test data, a confinement ratio model which considered the influence of hoop reinforcement, CFRP and the section effect was proposed.Then the definitions of lightly-confined, moderately-confined and heavily-confined were suggested using the proposed confinement ratio.The stress-strain model for CFRP moderately-confined square reinforced concrete columns was proposed based on the test results.The predicted results of the proposed model agreed well with test data.关键词
钢筋混凝土方柱/碳纤维/约束混凝土/单轴受压试验/应力-应变模型Key words
square RC columns/ carbon fiber/ confined concrete/ uniaxial compression test/ stress-strain model分类
建筑与水利引用本文复制引用
王震宇,王代玉,吕大刚,郭瑞峰..CFRP中等约束钢筋混凝土方柱单轴受压应力-应变模型[J].建筑结构学报,2011,32(4):101-109,9.基金项目
国家自然科学基金项目(51078109、50408010),地震行业科技专项基金项目(200808073). （51078109、50408010）
