Flexural Capacity Formula of Diaphragm-Through Joints of Concrete-Filled Square Steel Tubular Columns  

作　　者：Bin Rong Rui Liu Zhenyu Li Changxi Feng Guangchao You Fafitis Apostolos 

机构地区：[1]School of Civil Engineering,Tianjin University,Tianjin 300072,China [2]Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin 300072,China [3]Department of Civil and Environmental Engineering,Arizona State University,Tempe 85287,USA

出　　处：《Transactions of Tianjin University》2017年第3期258-266,共9页天津大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51268054 and No.51468061);Natural Science Foundation of Tianjin,China(No.13JCQNJC07300)

摘　　要：Finite element analysis and parametric studies were performed to investigate the flexural capacity of the panel zone of diaphragm-through joints between concrete-filled square steel tubular columns and H-shaped steel beams. Through the comparisons of failure modes, load–displacement curves, and bearing capacity, it was found that the flexural capacity of the panel zone of diaphragm-through joints was determined by the tensile action and influence of the web of H-shaped steel beams, and the axial load should be taken into account. The steel tube and the diaphragm were the major parts of the joint that resisted the bending moment. The contribution of in-filled concrete had little influence on the flexural capacity of the panel zone of the joint and could be neglected. According to the results of these numerical studies, a formula that considered the influence of the web of H-shaped steel beams and the axial load was developed based on the yield lines in the diaphragm and the steel tube. The results of the proposed formula were in good agreement with the numerical data of this investigation. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.Finite element analysis and parametric studies were performed to investigate the flexural capacity of the panel zone of diaphragm-through joints between concretefilled square steel tubular columns and H-shaped steel beams.Through the comparisons of failure modes,load–displacement curves,and bearing capacity,it was found that the flexural capacity of the panel zone of diaphragmthrough joints was determined by the tensile action and influence of the web of H-shaped steel beams,and the axial load should be taken into account.The steel tube and the diaphragm were the major parts of the joint that resisted the bending moment.The contribution of in-filled concrete had little influence on the flexural capacity of the panel zone of the joint and could be neglected.According to the results of these numerical studies,a formula that considered the influence of the web of H-shaped steel beams and the axial load was developed based on the yield lines in the diaphragm and the steel tube.The results of the proposed formula were in good agreement with the numerical data of this investigation.

关 键 词：Axial loads CONCRETES DIAPHRAGMS Steel beams and girders Tubular steel structures Web crawler 

分 类 号：TU398.9[建筑科学—结构工程]