Abstract

ARCHUNDIA ARANDA, Hans I.  and  TENA COLUNGA, Arturo. Diseño racional a cortante de trabes acarteladas de concreto reforzado. Concr. cem. investig. desarro [online]. 2015, vol.6, n.2, pp.2-29. ISSN 2007-3011.

Several equations to estimate the shear force in reinforced concrete haunched beams (RCHB) have been proposed after Mörsch (1909). Some of these equations agree with the classical beam theory while others rely on stress fields and truss models (strut-and-tie models). In contrast with the shear-design approaches based upon stress fields and truss models, the shear design supported on the beam theory is not capable to explain the shear-flexure interaction. Dilger and Langohr (1997) proposed a sectional shear method for prestressed RCHB supported on a truss model. They concluded that the beam theory is unsafe for nonprismatic elements. A sectional shear design method for RCHB supported on stress fields and truss models is proposed in this paper. It is confirmed with the proposed method that shear designs made with the sectional beam theory approach are also safe. The proposed design method is based upon rational definitions for the shear critical section, the beam slenderness and B-D regions.

Keywords : shear; haunched beams; tapered; stress fields; truss models; strut and tie models; beam slenderness; B-D regions.