Einheitliches Querkraftmodell zur Bemessung von Stahl- und Spannbetonbrücken im Bestand

Uniform Shear Design Method for Existing Reinforced and Prestressed Concrete Briges

While the flexural bending behavior of concrete structures can be described accurately, the shear behavior of slender beams still is subject of controversial discussions. For design praxis, easy to use and at the same time precise models are necessary to ensure economical design. The proposed uniform shear design procedure provides a continuous transition between beams without and with shear reinforcement. The comparison with the shear databanks of the ACI-DAfStb confirms that the proposed model provides a strongly reduced coefficient of variation as well as a higher degree of safety in comparison to the current model of EC2. Especially for beams with small amounts of shear reinforcement, higher shear capacities result which is beneficiary for the recalculation of existing structures like bridges. The exemplary recalculation of an existing bridge confirms a notable increase of the shear capacity for prestressed concrete bridges with small amounts of shear reinforcement.