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EXPERIMENTAL STUDIES ON BEHAVIOR OF EXPANSIVE CONCRETE-FILLED SQUARE STEEL TUBE COLUMNS UNDER ECCENTRICALLY COMPRESSED LOAD
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摘要: 方钢管膨胀混凝土结构是一种较为理想的钢管混凝土结构。通过对18根方钢管膨胀混凝土短柱的偏压试验研究,考察了方钢管膨胀混凝土结构的基本偏压力学性能。试验结果表明,掺入适量膨胀剂,方钢管膨胀混凝土偏压短柱的极限承载力提高程度可达3%～12%,另外,分析了膨胀剂、偏心率、宽厚比等因素对构件偏压相关力学性能和变形破坏过程的影响,所得结论可供有关工程设计和理论研究参考。Abstract: Square expansive concrete-filled steel tubes (ECFT) are a sort of optimization design for concrete-filled steel tubes (CFT) .Tests on 18 eccentrically compressed square ECFT specimens were carried out.The mechanical behavior of the members under eccentrically compressed load was studied.The experimental results indicated that the ultimate strength of eccentrically compressed square ECFT columns with appropriate expansion agent was increased by 3% ～ 12% as compared with that of ordinary CFT columns.Moreover,the influences of the expansion agent, eccentricity ratio and width-thickness ratio on the behavior of eccentrically compressed square ECFT columns were also investigated.The achievements of the paper could be a reference for the design and the theory study of square ECFT members．
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[2] Bridge R Q.Concrete Filled Steel Tubular Columns[R].Sydney，Australia: School of Civil Engineering， University of Sydney，1976. Knowles R B，Park R.Strength of Concrete Filled Steel TubularColumns[J].J.Smct.Engrg，ASCE，1969，95 (12 ): 2565 －2587. [3] 张正国.方钢管混凝土偏压短柱基本性能研究[J].建筑结构，1989，19(6): 10-20. [4] 左明生，李四平，王菁.方钢管混凝土偏压柱的试验研究[J]．郑州工学院学报，1992(3): 12-18. [5] 陶忠，韦灼彬，韩林海.方钢管混凝土压弯构件力学性能及承载力的研究[J].工业建筑，1998，28(10): 10-14. [6] Uy B.Strength of Short Concrete Filled High Strength Steel BoxColumns[J].Journal of Constructional Steel Research，2001，57(2): 113-134. [7] 郭兰慧.方形、矩形钢管高强混凝土构件力学性能分析与试验研究[D].哈尔滨: 哈尔滨工业大学，2002. [8] 卢方伟.新型钢管混凝土构件的理论和试验研究[D].上海:上海交通大学，2007． -
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