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(1 桂林理工大學(xué)土木與建筑工程學(xué)院, 桂林 541004; 2 廣西巖土力學(xué)與工程重點實驗室,桂林 541004; 3 中國市政工程西北設(shè)計研究院有限公司, 蘭州 730030)

摘要: 對于部分填充混凝土式窄幅鋼箱連續(xù)組合梁裂縫控制問題,對 3 根混凝土翼板-部分充填混凝土式窄幅鋼箱連續(xù)組合梁進行了靜力加載試驗。 試驗結(jié)果表明:組合梁負彎矩區(qū)承載性能得到明顯改善,但翼板裂縫控制效果不明顯。 基于超高性能混凝土(UHPC)良好的裂縫控制能力提出將部分充填混凝土式窄幅鋼箱連續(xù)組合梁翼板替換為 UHPC 翼板,形成 UHPC 翼板-部分充填混凝土式窄幅鋼箱連續(xù)組合梁。 采用 ABAQUS 有限元軟件建立了 5種組合梁的精細化模型,分析了組合梁全過程受力性能。 結(jié)果表明,UHPC 翼板-部分充填混凝土式窄幅鋼箱組合梁的開裂彎矩與截面承載能力顯著提高,各組合梁翼板與鋼梁交界面間的滑移差距不大。 考慮到經(jīng)濟因素,為提升組合梁負彎矩區(qū)截面的開裂彎矩,應(yīng)適當增加 UHPC 的板長,減小板厚。

關(guān)鍵詞: 鋼-混凝土組合梁; 雙重組合作用; 超高性能混凝土; 負彎矩區(qū)

中圖分類號:TU398. 9 文獻標志碼:A 文章編號:1002-848X(2022)13-0069-08

DOI:10. 19701 / j. jzjg. 20201823

Test and finite element analysis of ultra-high performance concrete flange-narrow width steel box composite beam’ s double combination effect under negative bending

YANG Hanjie1,3, MO Shixu1,2, ZHENG Yan1,2

(1 College of Civil Engineering, Guilin University of Technology, Guilin 541004, China;2 Guangxi Key Laboratory of Rock-soil Mechanic and Engineering, Guilin 541004, China;3 CSCEC AECOM CONSULTANTS Co. , Ltd. , Lanzhou 730030, China)

Abstract: About the crack control problem of partially concrete-filled narrow width steel box continuous beams, three normal concrete( NC) flange-partially concrete-filled narrow width steel box continuous composite beams were test under static loading. The test shows that the load-bearing performance of the composite beams under negative bending is obviously improved but the effect of controlling cracks of flange is not obvious. It is proposed to use ultra-high performance concrete (UHPC) replace partially-filled steel box-concrete continuous composite beam’ s plate under negative bending to became UHPC flange-narrow width steel box composite beam which based on UHPC excellent cracks control ability. 5 composite beam refined models were tested which used by ABAQUS finite element analysis software, the load-bearing preformance of the composite beams in the whole process was analyzed. According to results, UHPC flange-partially concrete-filled narrow width steel box continuous composite beams improve cracking moment and bearing capacity, and there is little difference on interface sliding between models. Due to economic factors, in order to increase the cracking moment value of composite beams under negative bending, the flange length of UHPC should be appropriately increased and the flange thickness should be reduced.

Keywords:steel-concrete composite beam; double combination effect; ultra-high performance concrete( UHPC) ; negative bending