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Shear-Vulnerability of Existing Pre-Stressed Concrete Bridges

In Part I, to formulate an operation directive the revised load assumptions for bridges of DIN Technical Report 101 are compared with the loading classes according to old standards and it is demonstrated, how the loading models can be modified based on actual traffic data. The current bridge asset in the Federal State of Hesse is evaluated using the "Road Information Database (Sub-Project: Structural Data)" in order to work out classification and evaluation criteria. Regarding the assessment of the shear load-bearing capacity the fundamentals of the shear load design models of DIN 1045, DIN 4227, DIN TR 102 and from the literature are compared. In Part II, the procedures for the subsequent strengthening of cross-sections and structural systems with a low shear load-bearing capacity are compiled. In addition, different types of finite element modelling are compared used for the calculation of the linear-elastic internal forces. Finally, based on the findings recommendations are formulated for an operation directive in regard to the assessment of shear-vulnerable bridges.