摘要
钢管对混凝土的套箍作用是钢管混凝土在受压后期受力性能的主要优势。但是实际工程中常出现混凝土与钢管脱粘的现象,对套箍作用的发挥产生不利的影响。进行了钢管混凝土单圆管短柱偏压试验研究,脱粘空隙的模拟采用预先放置双面涂油的镀锌板,并在混凝土浇筑5~6h后拔出的方法。试验的参数包括脱粘弧长率和含钢率。试验结果表明,这种模拟脱粘的方法是可行的。所有试件均为弯曲破坏,脱粘对试件的破坏模式没有影响,但有脱粘试件的曲率稍小于无脱粘试件。随脱粘弧长率的增大,试件极限承载力和延性均降低;而随着含钢率的增大,脱粘的不利影响程度降低。
The confinement on concrete core by the steel tube is the main advantage of concrete-filled steel tubular(CFST) column under compression.However,the debonding of concrete from the steel tube common and it ruins the confinement effect.In this paper,the influence of debonding on the behavior of CFST stub columns subjected to eccentrically loading is investigated experimentally.The debonding was formed by inserting galvanized sheet in the steel tube before the concrete is filled and pulling them out after 5~6 hours.The test validates this method to form a debonding in specimens.The parameters in the tests include the debonding arc-length ratio and steel ratio.All the specimens failure in flexural mode,which indicates that the debonding has no influence on the failure mode,but the curvature of the debonding specimen is a little smaller than that of the normal specimen.The ultimate load capacity and the ductility of the specimens are significantly decreased with the increase of debonding arc-length ratio,which can be relieved by a larger steel ratio.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2009年第S2期237-241,共5页
Journal of Building Structures
基金
福建省工程建设地方标准<钢管混凝土拱桥技术规程>课题
关键词
钢管混凝土
脱粘
单圆管
偏压试验
极限承载力
延性
concrete-filled steel tube
debonding
single tube
eccentrically loading experiment
ultimate load-carrying capacity
ductility
