鋼管膨脹混凝土圓柱軸壓受力性能與承載力計(jì)算方法研究*
陳詠明1，曹國輝2，陳朝輝3，胡佳星4
- 摘 要
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（1 湖南城市學(xué)院規(guī)劃建筑設(shè)計(jì)研究院，益陽 413000; 2 湖南城市學(xué)院土木工程學(xué)院，益陽 413000；3 湖南益晟機(jī)械科技有限公司，益陽 413064；4 湖南大學(xué)土木工程學(xué)院，長沙 410082）［摘要］通過4根低含鋼率鋼管混凝土圓柱的承載力試驗(yàn)，研究在不同荷載作用下4根圓柱的力學(xué)性能，對(duì)比鋼管膨脹混凝土圓柱與普通鋼管混凝土圓柱彈性泊松比的差異性，并探討國內(nèi)外鋼管混凝土圓柱軸壓極限承載力計(jì)算方法對(duì)低含鋼率的適用性。試驗(yàn)研究表明：膨脹劑對(duì)鋼管混凝土圓柱的軸壓極限承載力影響不大；低含鋼率鋼管混凝土圓柱在各級(jí)荷載作用下表現(xiàn)出彈性、彈塑性和塑性三個(gè)工作階段，且鋼管膨脹混凝土圓柱與普通鋼管混凝土圓柱橫、縱向應(yīng)變突變值相差較大；摻合膨脹劑的鋼管混凝土圓柱在彈性階段加載初期，泊松比接近于混凝土彈性泊松比，普通鋼管混凝土圓柱在彈性階段加載初期，泊松比接近于鋼管的彈性泊松比。同時(shí)，依據(jù)鋼管混凝土圓柱的破壞機(jī)理，分兩種情況提出鋼管混凝土圓柱軸壓極限承載力的計(jì)算方法，經(jīng)檢驗(yàn)，該方法計(jì)算效果較好。［關(guān)鍵詞］鋼管膨脹混凝土; 軸壓極限承載力; 理論分析; 試驗(yàn)研究中圖分類號(hào)：TU375 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2014)22-0036-05Research on mechanical performance and bearing capacity calculation method of expansive concrete filled steel tube columns under axial compressionChen Yongming1, Cao Guohui2, Chen Zhaohui3, Hu Jiaxing4(1 Research Institute of Planning Architecture Design, Hunan City University, Yiyang 413000, China; 2 College of Civil Engineering, Hunan City University, Yiyang 413000, China; 3 Hunan Yisheng Machinery Technology Co., Ltd., Yiyang 413064, China; 4 College of Civil Engineering, Hunan University, Changsha 410082, China)Abstract: Through bearing capacity tests on 4 low steel proportion of expansive concrete filled steel tube columns, mechanical performance of 4 cylinders at all levels of loads was studied. The difference of elastic poisson ratio between expansive concrete filled steel tube and ordinary concrete filled steel tube columns under various loads was compared. The axial compression ultimate bearing capacity calculation method of concrete filled steel tube with axial compression at home and abroad was discussed for the applicability of the low steel proportion. The experimental results show that expansion agent cannot influence the axial compression ultimate bearing capacity of concrete filled steel tube columns. Low steel proportion of concrete filled steel tube shows elastic, elastic-plastic and plastic stages of work at all levels of loads, and transverse and longitudinal strain mutation values are comparatively large different between expansive concrete filled steel tube and ordinary concrete filled steel tube columns. When the expansive concrete filled steel tube columns are in the early stage of elastic loading, the poisson ratio is close to the elastic poisson ratio of concrete; for ordinary concrete filled steel tube columns, the poisson ratio is close to the elastic poisson ratio of steel. Based on the failure mechanism of concrete filled steel tube, the calculation methods of axial compression ultimate bearing capacity for concrete filled steel tube in two different conditions were put forward. After the inspection, the effect of the calculation method is good.Keywords: expansive concrete filled steel tube; axial compression ultimate bearing capacity; theoretical analysis; experimental study*湖南省科技計(jì)劃項(xiàng)目(2012FJ4235)，湖南省自然科學(xué)基金項(xiàng)目（14JJ4062）。作者簡介：陳詠明，高級(jí)工程師，Email: 920516411@qq.com。參考文獻(xiàn)［1］李斌. 鋼管混凝土結(jié)構(gòu)的研究［D］. 西安: 西安建筑科技大學(xué), 2004.［2］肖海兵, 趙均海, 孫楚平, 等. 薄壁鋼管輕骨料混凝土軸壓短柱承載力分析［J］. 建筑結(jié)構(gòu), 2012, 42(11): 101-106.［3］幸坤濤, 岳清瑞. 高強(qiáng)鋼管混凝土核心柱軸壓短柱的承載力研究［J］. 鋼結(jié)構(gòu), 2002, 17(1): 18-21.［4］蔡健, 謝曉鋒, 楊春, 等. 核心高強(qiáng)鋼管混凝土柱軸壓性能的試驗(yàn)研究［J］. 華南理工大學(xué)學(xué)報(bào)：自然科學(xué)版, 2002, 30( 6) : 81-85.［5］張耀春, 王秋萍, 毛小勇, 等. 薄壁鋼管混凝土短柱軸壓力學(xué)性能試驗(yàn)研究［J］. 建筑結(jié)構(gòu), 2005, 35(1): 22-27.［6］聶建國, 趙潔, 柏宇, 等. 鋼管混凝土核心柱軸壓極限承載力［J］. 清華大學(xué)學(xué)報(bào)：自然科學(xué)版, 2005, 45(9): 1153-1156.［7］FURLONG R W. Concrete encased steel columns-design tables［J］. Journal of the Structural Division, 1974, 100(9): 1865-1882.
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