Experimental and Numerical Investigation on Bending Capacity of Steelconcrete Composite Truss Girder

Wang Yang*, 1, 2, Li Tian2
1 School of Civil Engineering, Taizhou Vocational & Technical College, Taizhou, Zhejiang 318000, P.R. China
2 School of Civil Engineering, Zhengzhou University, Zhengzhou, Henan 450002, P.R. China

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© 2015 Yang and Tian

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


This article presents an experimental investigation on the bending capacity of steel-concrete composite truss girder (SCCTG). Four full-scale specimens named CB1, CB2a, CB2b and CB3 respectively, are tested and numerical analyzed. Stress distribution, load-displacement relationship, load-slip relationship and ultimate bending capacity of SCCTGs are investigated. The results show that SCCTG follows plane section assumption on the whole. SCCTG has a higher ultimate bearing capacity and good performance of deformation. Concrete slab and the steel truss can work together better using denser studs. In elastic stage, the effective width of the SCCTG flange plate remains the same with negligible variation. While in plastic stage, the effective width increases. Tests also prove that there is obvious shear lag effect in the concrete compression flange. Three-dimensional numerical model by finite element package ABAQUS is established to examine the bending behaviour of SCCTG. Hopefully, an acceptable correlation has been observed between the analytical and experimental results. There is obvious shear lag effect in the concrete compression flange. Shear lag should be paid great attention when designing and calculating the bearing capacity and deformation of SCCTG.

Keywords: Bending behavior, effective width, experimental study, steel-concrete composite truss girder (SCCTG).

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