Investigation of Concrete Spine Beam Bridge Decks


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Title: Investigation of Concrete Spine Beam Bridge Decks

Author(s): M. A. Murtuza and R. J. Cope

Publication: Journal Proceedings

Volume: 82

Issue: 2

Appears on pages(s): 162-169

Keywords: bond (concrete to reinforcement); box beams; bridge decks; bridges(structures); cracking (fracturing); finite element method; models; reinforced concrete; reinforcing steels; stiffness; stresses; stress-strain relationships; structural analysis.

Date: 3/1/1985

Experimental and analytical investigation of two one-sixth scale single span reinforced concrete spine beam bridge models are presented. The models were of ordinary concrete and the design of one of the models was done using moment envelopes of linear elastic analyses and design of the second model was undertaken using engineering judgment backed by results of nonlinear analysis to take account of redistribution of elastic stresses. Each model was subjected to six load cases in the experiment in the serviceability limit state and a design ultimate loading before loading to failure. The analyses of the models were carried out by linear elastic and nonlinear finite element methods of analysis using rectangular shell elements. In the nonlinear finite eIement analysis a simplified material model was used to reduce computation time. It is observed that linear elastic analysis can be used to predict only the reactions of the models. The nonlinear finite element method can, however, also predict the deflections and strains reasonably. Although, if a linear elastic method is used for analysis, the actual deflections could be predicted by multiplying the linear elastic deflection by a factor of five.