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A platform for research: civil engineering, architecture and urbanism
Strength Assessment Methods for Concrete Bridges
Two half-scale models of bridges with very lightly reinforced deck slabs have been tested to failure under both the British ‘HB’ design load and single wheel loads. The strength of the models is assessed using a variety of approaches: conventional elastic analysis using British and American practice, yield-line analysis, a semi-empirical approach developed in Northern Ireland which allows for membrane action in the slab, the Ontario Highway Bridge Design Code (which also uses membrane action) and finally non-linear analysis. The predicted strength is found to differ greatly between the approaches, the ratio of highest to lowest prediction approaching ten in one case.
Under single wheel loads the least conservative prediction, that obtained using non-linear analysis, proved to be most accurate although the predictions obtained using the other methods which allow for membrane action were also acceptable. Under the HB load the non-linear analysis again gave the best prediction and the other predictions which considered membrane action proved to be unsafe, apparently due to failure to model the interaction of global and local effects. The conventional methods based on elastic theory were conservative in all cases.
Strength Assessment Methods for Concrete Bridges
Two half-scale models of bridges with very lightly reinforced deck slabs have been tested to failure under both the British ‘HB’ design load and single wheel loads. The strength of the models is assessed using a variety of approaches: conventional elastic analysis using British and American practice, yield-line analysis, a semi-empirical approach developed in Northern Ireland which allows for membrane action in the slab, the Ontario Highway Bridge Design Code (which also uses membrane action) and finally non-linear analysis. The predicted strength is found to differ greatly between the approaches, the ratio of highest to lowest prediction approaching ten in one case.
Under single wheel loads the least conservative prediction, that obtained using non-linear analysis, proved to be most accurate although the predictions obtained using the other methods which allow for membrane action were also acceptable. Under the HB load the non-linear analysis again gave the best prediction and the other predictions which considered membrane action proved to be unsafe, apparently due to failure to model the interaction of global and local effects. The conventional methods based on elastic theory were conservative in all cases.
Strength Assessment Methods for Concrete Bridges
Harding, J. E. (editor) / Parke, G. A. R. (editor) / Ryall, M. J. (editor) / Jackson, P. A. (author) / Cope, R. J. (author)
Bridge Management ; Chapter: 38 ; 429-438
1990-01-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
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