内填纤维混凝土加固钢管柱轴压性能研究  

Axial compression behavior of steel tube columns strengthened with fiber reinforced concrete

作　　者：石尚杰 卢亦焱[1] 李娜[1,2] SHI Shangjie;LU Yiyan;LI Na(School of Civil Engineering,Wuhan University,Wuhan 430072,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《混凝土》2024年第8期23-27,共5页Concrete

基　　金：国家自然科学基金(52238006)。

摘　　要：通过有限元方法研究内填纤维混凝土加固钢管柱轴压性能,分析钢管初应力、构件长细比、含钢率、内填混凝土强度等对加固柱受力性能的影响。结果表明:初应力的存在降低了加固钢管柱的轴压承载力,表现出初应力越大承载力降低越大的趋势;随着长细比的增大,初应力对加固钢管柱轴压承载力的影响越显著。通过引入承载力系数(K_(c))考虑钢管初应力对内填纤维混凝土加固钢管柱轴压承载力的影响,研究发现钢管初应力和长细比是影响K_(c)的主要因素,含钢率、内填混凝土强度等对K_(c)的影响为2%,计算承载力时可不予考虑。在此基础上,提出了考虑初应力影响的加固钢管柱轴压承载力计算式,计算值与试验值吻合较好。Through the finite element method,the axial compression performance of steel tube column strengthened with fiber reinforced concrete is studied,and the influence of initial stress of steel tube,slenderness ratio of members,steel ratio,strength of concrete filled on the mechanical performance of the strengthened column is analyzed.The results show that the existence of initial stress reduces the axial compression bearing capacity of the strengthened steel tube column,showing a trend that the greater the initial stress is,the greater the bearing capacity decreases.With the increase of slenderness ratio,the influence of initial stress on the axial compression capacity of strengthened steel tube columns is more significant.Through the introduction of bearing capacity coefficient(K_(c)),the influence of initial stress of steel tube on the axial compression bearing capacity of steel tube column strengthened with fiber reinforced concrete is considered.The study finds that initial(K_(c))stress of steel tube and slenderness ratio are the main factors affecting the axial compression bearing capacity of steel tube column,and the influence of steel ratio,strength of concrete filled,etc.is about 2%,which can be ignored when calculating the bearing capacity(K_(c)).On this basis,a formula for calculating the axial compression bearing capacity of reinforced steel tube columns con-sidering the influence of initial stress is proposed,and the calculated value is in good agreement with the experimental value.

关 键 词：纤维混凝土 钢管加固 初应力 有限元 轴压性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]