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(遼寧科技大學(xué)土木工程學(xué)院， 鞍山 114000)

摘要: 以軸壓比及截面尺寸為參數(shù)，對(duì) 12 個(gè)中空夾層鋼管混凝土試件進(jìn)行壓￣扭試驗(yàn)，并結(jié)合數(shù)值模型分析了扭轉(zhuǎn)全過(guò)程截面剪應(yīng)變開(kāi)展及鋼管與夾層混凝土相互作用力。 結(jié)果表明:較小的軸向壓力對(duì)極限抗扭承載力及扭轉(zhuǎn)剛度均影響甚微，所有試件均表現(xiàn)出較好的延性。 承載力受外鋼管強(qiáng)度影響較大，受混凝土強(qiáng)度影響較小，夾層混凝土對(duì)組合抗扭強(qiáng)度提高的作用隨含鋼率的增大而減小。 扭轉(zhuǎn)全過(guò)程截面不同位置處應(yīng)變開(kāi)展曲線重合度高，表明全截面約束均勻且變形一致。 夾層混凝土剪應(yīng)力隨著與截面中心距離的增大而增大，外鋼管與夾層混凝土相互作用力相較于內(nèi)鋼管要大得多，二者均表現(xiàn)為加載初期增長(zhǎng)較快，隨后逐漸變緩，外鋼管屈服后增幅趨近于 0。

關(guān)鍵詞: 中空夾層鋼管混凝土； 壓￣扭試驗(yàn)； 軸壓比； 抗扭性能； 含鋼率； 約束效應(yīng)

中圖分類號(hào):TU398. 9 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002￣848X(2022)06￣0090￣07

DOI:10. 19701 / j.jzjg.20200863

Experimental study on torsional behavior of concrete￣filled double skin steel tubes under axial load

LIAO Xu， LI Jiren， WANG Qingli

(School of Civil Engineering， Liaoning University of Science and Technology， Anshan 114000， China)

Abstract: With the axial compression ratio and section size as parameters， the compression￣torsion test of 12 concrete￣filleddouble skin steel tube specimens was carried out， and the cross￣section shear strain development during the whole torsionprocess and the interaction force between the steel tube and the sandwich concrete were analyzed combined with thenumerical model. The results show that the small axial pressure has little effect on the ultimate torsional bearing capacityand torsional stiffness， and all the specimens show good ductility. The bearing capacity is greatly affected by the strength ofthe outer steel tube and less by the strength of the concrete， and the effect of sandwich concrete on the improvement of thecombined torsional strength decreases with the increase of the steel ratio. The strain development curve at different positionsof the cross section during the whole torsion process has a high degree of overlap， which indicates that the full cross sectionhas uniform constraints and uniform deformation. And the shear stress of the sandwich concrete increases with the distancefrom the center of the cross section. The interaction force between the outer steel tube and the sandwich concrete is muchlarger than that of the inner steel tube， both of which show a rapid increase in the initial loading and a gradual slowdownlater， and the increase rate is close to 0 after outer steel tube yielding.

Keywords:concrete￣filled double skin steel tube； compression￣torsion test； axial compression ratio； torsional behavior；steel ratio； restraint effect

∗遼寧省教育廳基金(2017LNQN12)，遼寧科技大學(xué)人才引進(jìn)基金(2017RC09)，遼寧省“興遼英才計(jì)劃”(XLYC1902009)。

第一作者:廖栩，碩士研究生，主要從事鋼￣混凝土組合結(jié)構(gòu)方面的研究，Email:liaoxu1995@ 126.com。

[引用本文] 廖栩，李吉人，王慶利. 軸壓荷載下中空夾層鋼管混凝土抗扭性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu)，2022， 52(6):90￣96，125. LIAO Xu， LI Jiren， WANG Qingli. Experimental study on torsional behavior of concrete￣filled double skinsteel tubes under axial load[J]. Building Structure， 2022， 52(6):90￣96，125.