Experimental results of Delft blind prediction contest on shear behaviour of continuous precast girders
Mohammed S. Ibrahim (TU Delft - Concrete Structures)
Mauro Poliotti (TU Delft - Concrete Structures)
Yuguang Yang (TU Delft - Concrete Structures)
Max A.N. Hendriks (Norwegian University of Science and Technology (NTNU), TU Delft - Engineering Structures)
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Abstract
Precast girders are mainly used as a simply supported system to build multi-span bridges. Alternatively, the precast girders can be made continuous at the intermediate support using cast in situ topping and cross beams. In the Netherlands, a substantial number of these bridges were designed and constructed in this way by following the design regulations in the past. When they are reassessed using Eurocode and the Guidelines for Assessment of Existing Bridges (RBK) by the Rijkswaterstaat (Dutch Ministry of Infrastructure and Water Management), their shear capacity turns out to be insufficient. Since almost no experimental data are available in the literature that can justify the code prediction for this bridge type, a dedicated experimental program has been established to investigate the actual shear behaviour. As a part of this program, this study presents the experimental observation of two full-scale 15 m long shear tests that were part of the recent blind contest at the Delft University of Technology. Using the experimental observations, the predictions of RBK, Model Code, and FprEN 1992-1-1:2023 (Draft for the 2nd generation of Eurocode 2 ) are examined. The comparison of the codes against the test shows safe and over-conservative predictions for both empirical and strain-based approaches.