Experimental research on ultimate bearing capacity of grouted-round-steel-tube N-joint  

作　　者：郑文忠 柳旭东 张格明 张博一 

机构地区：[1]School of Civil Engineering,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2007年第3期322-329,共8页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the New Century Excellent Talents in University(Grant No.290);Heilongjiang Key Program on Science and Technology(Grant No.GC04A609);Harbin Key Program on Science and Technology(Grant No.2004AA9CS187).

摘　　要：As an important structural member in self-supporting concrete floor during construction,encased steel truss-concrete composite beam has brilliant prospect in outer-jacketing structures for adding stories or mega frame structures.Compared with encased angle truss,encased round steel tube truss can facilitate layout of itself in column and facilitate layout and anchorage of prestressed reinforcement placed horizontally.N-joint is wildly used in encased steel truss.For cave-in failure easily occurs in hollow steel-tube joint,the idea that the chord is grouted to increase cave-in bearing capacity of hollow tube is proposed.Test results of 8 grouted-round-steel-tube N-joints from the beginning of loading to failure are reported.Mechanical property and failure mode of this kind of truss joint are analyzed,and the formulas of ultimate bearing capacity of the joint corresponding to different failure modes are established.All these can provide basic data for spreading encased steel truss-concrete composite beam.As an important structural member in self-supporting concrete floor during construction,encased steel truss-concrete composite beam has brilliant prospect in outer-jacketing structures for adding stories or mega frame structures. Compared with encased angle truss, encased round steel tube truss can facilitate layout of itself in column and facilitate layout and anchorage of prestressed reinforcement placed horizontally. N-joint is wildly used in encased steel truss. For cave-in failure easily occurs in hollow steel-tube joint, the idea that the chord is grouted to increase cave-in bearing capacity of hollow tube is proposed. Test results of 8 grouted-roundsteel-tube N-joints from the beginning of loading to failure are reported. Mechanical property and failure mode of this kind of truss joint are analyzed, and the formulas of ultimate bearing capacity of the joint corresponding to different failure modes are established. All these can provide basic data for spreading encased steel truss-concrete composite beam.

关 键 词：groined-round-steel-tube N-joint model test simulated analysis failure mode bearing capacity 

分 类 号：TU378.5[建筑科学—结构工程]