Bending behaviour of lightweight aggregate concrete-filled steel tube spatial truss beam  

作　　者：傅中秋 吉伯海 朱伟 葛汉彬 

机构地区：[1]College of Civil and Transportation Engineering, Hohai University [2]Department of Civil Engineering, Meijo University

出　　处：《Journal of Central South University》2016年第8期2110-2117,共8页中南大学学报（英文版）

基　　金：Project(51208176)supported by the National Natural Science Foundation of China;Projects(2012M511187,2013T60493)supported by the China Postdoctoral Science Foundation;Project(2015B17414)supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase.A lightweight aggregate concrete-filled steel tube（LACFST） spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase.

关 键 词：lightweight aggregate concrete-filled steel tube spatial truss beam bending behaviour bearing capacity 

分 类 号：TU398.9[建筑科学—结构工程]