方形截面碳纤维增强聚合物-钢管混凝土轴压柱的静力试验  

Static test on axially compressed concrete filled CFRP-steel tubular columns with square cross-section

作　　者：王庆利[1] 赵维娟[1] 李佳[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《建筑结构学报》2013年第S1期267-273,共7页Journal of Building Structures

基　　金：教育部新世纪优秀人才支持计划(NCET-08-0865);国家自然科学基金面上项目(51378320)

摘　　要：以长细比和纵向碳纤维增强聚合物(CFRP)增强系数为主要参数,进行了24个方形截面CFRP-钢管混凝土(S-CFRPCFST)轴压柱的静力性能试验研究。试验结果表明:柱的载荷-中截面挠度曲线可以分为弹性工作段、弹塑性工作段和荷载下降段;纵向CFRP可以提高柱的承载力和初始刚度;柱的挠曲线近似正弦半波曲线;钢管和CFRP在横向和纵向都可以协同工作;同一测点的纵向应变与横向应变异号,受拉侧钢管对混凝土没有横向约束作用;钢管的纵向应变沿截面高度的分布基本符合平截面假定。应用ABAQUS软件对柱的载荷-中截面挠度曲线和变形模态进行有限元分析,分析结果与试验结果吻合良好。Taking slenderness ratio and strengthening factor of the longitudinal CFRP as the principal parameters,static behavior of 24 axially compressed concrete filled CFRP-steel tubular(S-CFRP-CFST) columns with square cross-section were experimentally investigated.The test results show that the load-deflection curves on the cross-section at mid-height of the composite columns can be divided into elastic stage,elasto-plastic stage and softening stage.The longitudinal CFRP can enhance the load carrying capacity and the initial stiffness of the members effectively.Analysis on the experimental results shows that deflection curves of the tested members behave much similar to half sinusoidal curve.Furthermore,the steel tube and the CFRP tube could cooperate both in the circumferential and in the longitudinal directions.It is also found that the longitudinal strain and the transverse strain at the same point is opposite in tension or compression,and the steel tube under longitudinal tension has no transverse confinement effect on its concrete.In addition,the distribution of longitudinal strains of the steel tube over depth of the cross-section satisfies with plane section assumption approximately.The load-deflection curves on the cross-section at mid-height and the deformed mode of the composite members were simulated using ABAQUS software.The predicted results agreed well with the experimental results.

关 键 词：方形截面碳纤维增强聚合物-钢管 内填混凝土 轴压柱 静力试验 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]