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(1 中國地震局工程力學研究所, 哈爾濱 150080; 2 中國地震局地震工程與工程振動重點實驗室,哈爾濱 150080; 3 遼寧科技大學土木工程學院, 鞍山 114051)

摘要: 以混凝土強度、截面寬厚比和是否填充混凝土為參數(shù),進行了 5 個冷彎方鋼管混凝土試件和 1 個冷彎方鋼管試件的軸心受拉性能試驗。 使用 ABAQUS 軟件對試件進行了有限元模擬,模擬的荷載-應變曲線與試驗結果吻合較好。 對混凝土的開裂點、鋼管與混凝土的拉力分配、承載力的提高程度和工作機理等方面進行了研究。 結果表明:隨寬厚比的增大,試件的斷裂應變呈減小的趨勢;試件破壞位置集中在跨中和距加載端 1 / 3 試件高度處,斷面呈水平方向或與中截面呈 45°;在試件中截面測點的縱向應變?yōu)?150με 左右時,核心混凝土開裂,試件剛度出現(xiàn)折減;寬厚比在 15 ~ 240 的范圍內(nèi),混凝土的填充對鋼管的軸拉承載力提高幅度在 3. 03% ~ 30. 75%。 基于參數(shù)分析擬合出了冷彎方鋼管混凝土的軸拉承載力公式。

關鍵詞: 冷彎方鋼管混凝土; 軸心受拉; 承載力; 寬厚比; 有限元模擬; 工作機理

中圖分類號:TU398. 9 文獻標志碼:A 文章編號:1002-848X(2022)13-0086-08

DOI:10. 19701 / j. jzjg. 20210800

Study on mechanical properties of cold-formed concrete-filled square steel tube under axial tension

GAO Huaguo1,2,3, ZHANG Lingxin1,2, JIAO Chenxing3, WANG Qingli3

(1 Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China; 2 Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration, Harbin 150080, China; 3 College of Civil Engineering, Liaoning University of Science and Technology, Anshan 114051, China)

Abstract: Taking concrete strength, cross-section width-thickness ratio and concrete filling or not as parameters, five cold-formed concrete-filled square steel tube specimens and one cold-formed square steel pipe specimen were tested in axial tension. The finite element simulation of the specimens was carried out using ABAQUS software, and the simulated load-strain curve was in good agreement with the test results. The cracking point of concrete, the distribution of tensile force between steel tube and concrete, the improvement degree of bearing capacity and working mechanism were studied. The results show that with the increase of the width-thickness ratio, the fracture strain of the specimen shows a decreasing trend; the failure position of the specimen is concentrated in the middle of the span and 1 / 3 of the height of the specimen from the loading end, and the section is in the horizontal direction or at 45° to the mid-section; when the longitudinal micro-strain of the cross-section measurement point in the specimen is about 150με , the core concrete cracks and the stiffness of the specimen is reduced; the width-thickness ratio is in the range of 15 ~ 240, and the filling of concrete affects the axial tension of the steel pipe, the increase in bearing capacity is 3. 03% ~ 30. 75%. Based on the parameter analysis, the formula for the axial tensile bearing capacity of the cold-formed concrete filled square steel tube was fitted.

Keywords:cold-formed concrete-filled square steel tube; axial tension; bearing capacity; width-thickness ratio; finite element simulation; working mechanism