薄壁钢管混凝土短柱轴压力学性能试验研究张耀春.pdf

35 1 2005 1 张耀春 王秋萍 毛小勇 曹宝珠 ( 150090) [] 26 , ( ) , , , , , [] Research on Mechanics Behavior of Stub-column of Concrete-filled Thin-walled Steel Tube Under Axial Load Author:Zhang Yaochun,Wang Qiuping, Mao Xiaoyong, Cao Baozhu( chool of Civil Engineering,Harbin Institute of T echnology,Harbin 150090, China) Abstract:T wenty six stud-columns of concrete-filled thin-walled steel tube( CFT T ) with circular, square or octagon cross-sections are tested under axial compression loads.T he influences of cross-section, width( diameter)-to-thickness ratio,strength grade of concrete,ratio of steel on the static mechanics behavior of CFT T are investigated.T he results show that the local buckling and post buckling behaviors of the steel tube are increased by the support of concrete, and the failure mode of CFT T is obviously different from that of the CF T. Based on the regression analysis, the practical formulas of the ultimate compressive strength of CFT T are derived. The influences of the parameters on the static mechanics behaviors of CFT T are also discussed. Ke words:column of concrete-filled thin-walled steel tube( CFT T) ; mechanics behavior;stub-column test; local sta- bility; failure mode; practical formula 60 235/f y , , , ( ) 75~ 100( , , ) , 80~ 120( ) , L / D = 3[ 2] , ; 1 , 21 , ( ) , , 1 , , , 10mm , , , ,26