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(湖北工程學(xué)院土木工程學(xué)院，孝感 432000)

［摘要］為研究方鋼管UHPC短柱試件的軸心受壓性能，以鋼管厚度、UHPC強(qiáng)度、鋼材強(qiáng)度為參數(shù)，完成了16組方鋼管UHPC短柱試件軸心受壓試驗(yàn)。依據(jù)試件的破壞模式、荷載-變形曲線、荷載-應(yīng)變曲線發(fā)展變化規(guī)律對(duì)方鋼管UHPC短柱的承載力、延性和軸壓機(jī)理進(jìn)行了分析。試驗(yàn)結(jié)果表明：方鋼管UHPC短柱軸向荷載-變形曲線可分彈性、彈塑性和塑流三個(gè)階段；軸向荷載-變形曲線形狀與套箍系數(shù)密切相關(guān)，依據(jù)塑流階段不同可分為下降型、平緩型和上升型三類；鋼管與UHPC之間的相互作用具有滯后效應(yīng)，主要發(fā)生在塑流階段；隨套箍系數(shù)增大，短柱試件延性和承載力有增大趨勢(shì)，但延性增加更顯著，鋼管與UHPC之間的相互作用主要體現(xiàn)在改善UHPC延性上；基于延性和經(jīng)濟(jì)性指標(biāo)，建議方鋼管UHPC軸壓短柱的套箍系數(shù)不宜大于3。 

［關(guān)鍵詞］方鋼管UHPC短柱； 軸心受壓； 套箍系數(shù)； 相互作用； 延性； 承載力 

中圖分類號(hào)：TU398 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)12-0117-07

Experimental study on behavior of square UHPC filled short steel tube columns subjected to axial compression

YAN  Yanxiang 

(School of Civil Engineering, Hubei Engineering University，Xiaogan 432000， China) 

Abstract: To investigate the axial compressive behavior of square UHPC filled short steel tube columns (SUHPCFSSTs), a total of 16 groups with test parameters of the steel tube thickness, UHPC strength and steel strength were tested under axial loads. Based on the development law of failure modes, load-deformation curve and load-strain curve, the compressive mechanical, ductility, bearing capacity of SUHPCFSSTs were studied. The experimental results show that the axial load-deformation curve of SUHPCFSSTs can be divided into three phases including elastic, elastoplastic and plastic flow stages. The shape of the axial load-deformation curves is closely related to constraining index. According to the difference in the plastic flow stage, the shapes of the axial load-deformation curve can be divided into three categories: descending type, gentle type and ascending type. The interaction between steel tube and UHPC has a hysteresis effect, which generates mainly in the plastic flow stage. The ductility and bearing capacity of short column specimens increase with the increase of constraining index, but the ductility increases more significantly. The interaction between steel tube and UHPC is mainly reflected in improving the ductility of UHPC. Considering the ductility index and economy, the constraining index of SUHPCFSSTs is recommended no more than 3.

Keywords:square UHPC filled steel tube column； axial compression； constraining index； interaction； ductility； bearing capacity

*國(guó)家級(jí)大學(xué)生創(chuàng)新創(chuàng)業(yè)訓(xùn)練計(jì)劃項(xiàng)目（202010528012）,孝感市自然科學(xué)計(jì)劃項(xiàng)目（XGKJ2019010049）。

 作者簡(jiǎn)介：顏燕祥，博士，講師，Email：yyxtm@163.com。