College of Engineering, University of Mustansiriyah discussed a master dissertation on the compound effect of shear and torsion forces on a multi-layer deep reinforced concrete beam by the postgraduate student, Mr. Siraj Khaled Yaqoub.

The dissertation aimed at evaluating the performance of deep multi-layered concrete beams when subjected to the combined effect of shear and torsion by modeling the elements via using the abacas program and depending on the plasticity property of concrete.

The dissertation reviewed the creation of shear and torsion models on deep beams made of ordinary concrete, according to the experimental results of previous works and the representation of concrete elements using linear low integration elements with eight knots and the employment of a linear truss element consisting of two knots with three degrees of freedom for steel elements and modeling many multiple deep beams Layers of two types of concrete.

The dissertation concluded that increasing the thickness of the fiber-reinforced concrete layer makes the failure pattern move from single cracks to several diagonal cracks with cracks with greater detectability, and that the failure mode changes from joint shear and torsion to more torsion failure is more evident in the deep lintels made Layers of high-strength concrete with regular concrete.