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(1 國網(wǎng)甘肅省經(jīng)濟技術(shù)研究院, 蘭州 730000; 2 西安建筑科技大學(xué)土木工程學(xué)院, 西安 710055)

摘要: 對 4 組共 8 個不同內(nèi)部構(gòu)造形式的鋼管混凝土試件進(jìn)行了偏心受壓試驗。 結(jié)果表明:各組試件的破壞模式均為試件整體彎曲,偏壓側(cè)鋼管局部鼓曲。 內(nèi)配縱向加勁肋減緩了鋼管的局部鼓曲。 與普通鋼管混凝土試件相比,內(nèi)配縱向加勁肋試件的極限承載力提高 3. 80%,內(nèi)配格構(gòu)式鋼骨試件的極限承載力提高 8. 28%,同時配置縱向加勁肋和格構(gòu)式鋼骨試件的極限承載力提高 14. 33%。 利用有限元軟件對內(nèi)配格構(gòu)式鋼骨-鋼管混凝土構(gòu)件進(jìn)行偏心受壓數(shù)值模擬,分析了構(gòu)件的受力機理和各部件的應(yīng)力發(fā)展過程,研究了混凝土強度、鋼管強度、鋼管徑厚比、鋼骨強度、鋼骨尺寸以及荷載偏心距對其承載性能的影響。 提出了內(nèi)配格構(gòu)式鋼骨-鋼管混凝土構(gòu)件的偏壓承載力計算公式,公式計算結(jié)果與試驗結(jié)果吻合較好。

關(guān)鍵詞: 格構(gòu)式鋼骨; 鋼管混凝土; 偏心受壓; 試驗研究; 承載力計算方法

中圖分類號:TU392. 3 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2022)13-0077-09

DOI:10. 19701 / j. jzjg. 20212285

Experimental study on eccentrically compression behaviour of concrete-filled steel tubular members with reinforcing lattice angles

CHEN Qingsheng1, LI Bofan2, KONG Long1, RONG Lu2, HOU Xinyu2, WANG Xiantie2

(1 State Grid Gansu Economic Research Institute, Lanzhou 730000, China; 2 School of Civil Engineering, Xi’ an University of Architecture and Technology, Xi’ an 710055, China)

Abstract: The eccentric compression tests of 4 sets concrete-filled steel tubular( CFST) specimens with different internal details of the longitudinal stiffeners and lattice steels were carried out. The results show that the failure pattern of all specimens are overall instability accompanied by local buckling of the steel tube. For the specimens with longitudinal stiffeners, local buckling of steel tube buckling are reduced. The ultimate load bearing capacity of the specimen with longitudinal stiffeners, reinforcing lattice angles and both longitudinal stiffeners and reinforcing lattice angles increases by 3. 80%, 8. 28% and 14. 33%. The numerical simulation analysis of eccentric compression was carried out on the CFST with reinforcing lattice angles, and the force mechanism of the member and the stress development process of each component were obtained. The influence of concrete strength, steel tube strength, tube diameter-thickness ratio, lattice angles steel strength, lattice angles size and load eccentricity on its load-bearing performance was obtained. The formula for calculating the eccentric bearing capacity of the CFST member with reinforcing lattice angles was proposed. The calculation results of the formula are in good agreement with the test results.

Keywords:reinforcing lattice angle; concrete-filled steel tubular; eccentric compression; experimental study; bearing capacity calculation method