Experimental study on the influence of concrete cracking on timber concrete composite beams

This work presents an experimental study on the flexural behavior of steel tube slab composite beams subjected to pure bending. The main design elements considered in the work are the flange thickness, reinforcement ratio of high strength bolts, spacing between the tubes, and transverse patterns of the tube connections. Based on nine flexural experiments on simply supported steel tube slab specimens, the failure process and crack development in steel tube slab specimens, and their load–deflection curves are investigated. The results of the laboratory tests show that the welding of the bottom flange significantly improves the flexural capacity of the steel tube slab structure. In addition, a lower concrete’s compressive strength improves the ductility of the steel tube slab specimens. Moreover, the flexural capacities predicted from the design guidelines are in good agreement with the experimental test results. Finally, based on the numerical simulations using the ABAQUS software, a numerical model is established to further investigate the effect of the additional parameters on the flexural capacity of steel tube slab structures. The numerical results suggested that the diameter of the steel bolts and the reinforcement ratio have a limited effect on the flexural bearing capacity of the steel tube slab beams, and the ultimate bearing capacity increases linearly along with increase in the diameter of the steel bolts and the reinforcement ratio in a certain range.

Download Full-text

An experimental study on the flexural behavior of cold-formed steel composite beams

Materials Today Proceedings ◽

10.1016/j.matpr.2019.11.098 ◽

2020 ◽

Vol 27 ◽

pp. 340-343

Author(s):

A.R. Dar

Keyword(s):

Experimental Study ◽

Composite Beams ◽

Flexural Behavior ◽

Steel Composite ◽

Cold Formed Steel

Download Full-text

GBT Analysis of Steel-Concrete Composite Beams: Recent Developments

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455420410072 ◽

2020 ◽

Vol 20 (13) ◽

pp. 2041007

Author(s):

Rodrigo Gonçalves ◽

Dinar Camotim ◽

David Henriques

Keyword(s):

Finite Element ◽

Beam Theory ◽

Composite Beams ◽

Arbitrary Cross Section ◽

Mode Shapes ◽

Shear Lag ◽

Buckling Mode ◽

Concrete Cracking ◽

Lag Effects ◽

Recent Developments

This paper reports the most recent developments concerning Generalized Beam Theory (GBT) formulations, and corresponding finite element implementations, for steel-concrete composite beams. These formulations are able to perform the following types of analysis: (i) materially nonlinear analysis, to calculate the beam load-displacement response, up to collapse, including steel plasticity, concrete cracking/crushing and shear lag effects, (ii) bifurcation (linear stability) analysis, to obtain local/distortional bifurcation loads and buckling mode shapes of beams subjected to negative (hogging) bending, accounting for shear lag and concrete cracking effects and (iii) long-term service analysis including creep, cracking and arbitrary cross-section deformation (which includes shear lag) effects. The potential (computational efficiency and accuracy) of the proposed GBT-based finite elements is illustrated through several numerical examples. For comparison purposes, results obtained with standard finite strip and shell/brick finite element models are provided.

Download Full-text

Experimental Study of FRC-Encased Steel Joist Composite Beams

Journal of Structural Engineering ◽

10.1061/(asce)0733-9445(1999)125:5(495) ◽

1999 ◽

Vol 125 (5) ◽

pp. 495-502 ◽

Cited By ~ 6

Author(s):

Madhusudan Khuntia ◽

Subhash C. Goel

Keyword(s):

Experimental Study ◽

Composite Beams

Download Full-text