
第34卷第2期 2017年3月
土木工程与管理学报 Journal of Civil Engineering and Management
Vol.34 No.2 Mar.2017
钢管钢纤维自应力自密实柱轴心受压性能
卢亦焱,严博,李娜,李杉(武汉大学土木建筑工程学院,湖北武汉430072)
摘要:本文通过对6根短柱,包括2根钢管钢纤维自密实混凝土短柱、1根钢管自应力自密实混凝土短柱、1 根钢管自密实混凝土短柱和2根钢管钢纤维自应力自密实混凝土短柱的轴心受压试验,分析初始自应力和钢纤维体积掺量对钢管钢纤维自应力自密实混凝土轴心受压短柱力学性能的影响。结果表明,初始自应力将显著提高短柱的承载力和刚度,但会导致其变形能力明显下降;掺人钢纤维可缓解自应力引起的变形能力的下降,并改善钢管对混凝土的约束作用。
关键词:钢管混凝土结构;自应力混凝土;钢纤维混凝土;自密实混凝土;受压性能
中图分类号:TU528.59
文献标识码:A文章编号:2095-0985(2017)02-0001-04
Compressive Behavior of Steel Tube Columns Filled with Steel Fiber Reinforced
Self-stressingandSelf-compactingConcrete
LUYi-yan,YAN Bo,LI Na,LI Shan
(School of Civil Engineering, Wuhan University, Wuhan 430072, China)
Abstract: Six short columns, including two steel tube short columns filled with steel fiber reinforced self-compacting concrete, one steel tube short columns filled with self-stressing and self-compacting concrete , one steel tube short columns filled with self-compacting concrete and two steel tube short columns filled with steel fiber reinforced self-stressing and self-compacting concrete, were concentrically loaded to failure. The variables investigated are self-stress and steel fiber volume percentage. The results indicated that the self-stress can significant enhance the load carrying capacity of the specimens, but lead to obvious decrease of their deformability. Adding steel fiber not only relieves the decrease of deformability caused by self-stressing, but also effectively improves the confinement of steel tube to concrete.
Key words: concrete filled steel tube; self-stressing concrete; steel fiber reinforced concrete :
self-compacting concrete; compressive behavior
钢管混凝土结构是一种性能优越的钢-混凝
土组合结构形式,在钢管混凝土结构中,钢管约束作用可以提高混凝土的强度和塑性变形能力,而核心混凝土可以起到支撑作用,延缓或者避免钢管的局部屈曲,提高钢管稳定性和承载能力。因此,钢管混凝土结构能够充分发挥钢管和混凝土的优势,具有强度高、延性好、耐疲劳,良好的抗火和抗冲击性能等优点[1~4]。
收稿日期:2016-07-15修回日期:2016-12-07
随着内填混凝土材料的不断发展,钢管混凝土结构也得到发展和完善。以自密实混凝土为内填材料的钢管自密实混凝土结构可以解决施工振捣难题,但会引起更大的收缩[5-7];以自应力混凝土为内填材料的钢管自应力混凝土可以通过自身膨胀变形来补偿混凝土的收缩,改善钢管和混凝土的相互作用,产生较大的自应力从而提高其承载力,但是将明显降低结构的变形能力[8~10]。基
作者简介:卢亦焱(1965-),男,福建龙岩人,博士,教授,研究方向为结构加固理论与运用、钢与混凝土组合结构理论与应用
(Email : ylu901@ 163.com)
基金项另-浮變糖博士点专项基金项目(2011014110002))