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It is the contention in this study that the presence of flexural moment on confined masonry walls has an effect in the shear force that produces the first diagonal cracks due to tension. A hypothesis that relates distortion with cracking was proposed a priori and based on it a mathematical expression was developed that predicts the cracking shear force in a wall when a flexural moment is applied on its top. Afterwards, the results of a pilot experimental study consisting of two full scale confined masonry walls is presented: one tested with only lateral and axial loads, used as reference and a second one tested with flexural moment, axial force and increasing shear force. It was found, in the latter case, a reduction of the diagonal tension cracking shear load in good agreement with the prediction of the proposed mathematical model. Some observations and recommendations for an ampler study are given.

EFECTO DEL MOMENTO FLEXIONANTE EN LA FUERZA CORTANTE QUE PRODUCE EL AGRIETAMIENTO POR TENSIÓN DIAGONAL EN MUROS DE MAMPOSTERÍA CONFINADA