Influencia de la distribución de estribos y del ancho de lo apoyos en la resistencia a cortante de vigas planas de hormigón armado

Influence of stirrups distribution and supports width in flat reinforced concrete beams to shear strength

In this article we show the results achieved by an experimental test programme on flat beams of 750 mm deep and 3 m free light, designed to break by shear. The achieved resistant capabilities have been compared to those, which could be obtained applying the spanish instruction ERE, the code equations ACI-318-95 and Eurocode-2. From the above comparation you may deduce that there is a clear influence of stirrups distribution, the cross separation between each stirrup branch and the supports width in strength to shear, and we propose some modifications to add in the spanish instruction EHE calculation formula in order to take into account such an sects. Finally, it may be deduced some recommendations about stirrups distribution in order to optimise their effectiveness and in order to prevent premature ruptures.