Analysis of behavior of prestressed concrete structures subjected to torsion and flexion

Abstract

Reinforced concrete members subjected to simultaneous action of the bending moment, shear force and the torsional moment are not sufficiently investigated. Influence of the torsional moment on behavior of such structures is not known. Methods of analysis do not reflect actual behavior of beam structures during their use and failure. Performed experimental investigations and inspection of existing structures demonstrated that damages may appear in the structures during their use if action of the torsional moment is not taken into account in design of reinforced concrete structures. Especially it is the case in pre-cast reinforced concrete beams on which slabs of 2T type are supported. In analysis of reinforced concrete members subjected to simultaneous action of bending and torsion, the shape of cross-section of members, the type of loading, ratio of the bending moment (M) to shear the force (V) and the torsional moment (T) are of great influence. The principle stresses are generated in the cross-section direction of which depends on ratio between M, V, and T.