- 摘 要
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(河南理工大學土木工程學院， 焦作 454150)
［摘要］為研究穿孔肋拉桿約束方鋼管混凝土短柱的軸壓性能，完成了穿孔肋拉桿約束方鋼管混凝土短柱與僅設約束拉桿、僅設加勁肋、普通方鋼管混凝土短柱對比試件的軸心受壓試驗；觀察了試件的受力全過程和破環(huán)特征，分析了試件的荷載-位移曲線、荷載-應變曲線、軸壓承載力、延性、含鋼率等性能指標。結果表明：穿孔肋拉桿的設置使鋼管壁對核心混凝土的約束作用更趨均勻，改變了鋼管的局部屈曲變形狀態(tài)，顯著提高了方鋼管混凝土柱的軸壓承載力和延性；當柱截面含鋼率相同時，與僅設加勁肋的鋼管混凝土柱相比，穿孔肋拉桿約束方鋼管混凝土短柱的軸壓承載力提高了7%，延性提高了30%；與僅設約束拉桿的方鋼管混凝土柱相比，穿孔肋拉桿約束方鋼管混凝土柱的軸壓極限承載力提高了10%，延性提高了19%。
［關鍵詞］方鋼管混凝土短柱；穿孔肋；拉桿；軸壓承載力；延性；含鋼率
中圖分類號：TU398-7 文獻標識碼：A文章編號：1002-848X(2021)16-0058-06
Experimental study on axial compression of square CFST short columns constrained by bars through perforated ribs
ZHENG Xinzhi, SUN Yutao, GUO Haozhen
(School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454150， China)
Abstract: To investigate the axial compressive behavior of square CFST short columns constrained by bars through perforated ribs. The axial compression test of square CFST short column constrained by bars through perforated ribs, the only constrained by bars, the only constrained by stiffeners, and the ordinary CFST short columns was completed. The whole loading process and failure characteristics of specimens were observed，the load-displacement curves, load-strain curves, axial bearing capacity, ductility and steel ratio were also analyzed. The results show the arrangement of the bars through perforated ribs makes the restraining effect of steel tube wall to the core concrete more uniform, changes the local buckling deformation state of steel tube, and significantly improved the bearing capacity and ductility of square CFST columns under axial compression. Under the same steel ratio of the cross-section, the axial bearing capacity and ductility of square CFST column constrained by bars through perforated ribs are increased by 7% and 30% respectively compared with the contrastive column only with ribs. The axial bearing capacity and ductility of square CFST column constrained by bars through perforated ribs are increased by 10% and 19% respectively compared with the contrastive column only with bars.
Keywords:square CFST short column； perforated rib； bar； axial bearing capacity； ductility； steel ratio
*河南省重點研發(fā)與推廣專項（科技攻關）項目（182102310010），河南省高等學校重點科研項目（17A560023）。
作者簡介：鄭新志，博士，副教授，碩士生導師，Email: zxz@hpu.edu.cn； 通信作者：孫玉濤，碩士，Email:305853455@qq.com。
