Analysis of Web Forces in Concrete Beams


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Title: Analysis of Web Forces in Concrete Beams

Author(s): N. Rajagopalan

Publication: Journal Proceedings

Volume: 73

Issue: 7

Appears on pages(s): 410-415

Keywords: beams 9supports); bond (concrete to reinforcement); cracking (fracturing); crack width and spacing;failure mechanisms;partial prestressing; prestressed concrete; reinforced concrete; reinforcinng steels;shear properties; strain energy methods.

Date: 7/1/1976

Describes an analytical pracedure for evaluating the Web forces of concrete beams in the flexural shear crack zone. The proposed method, is applicable for prestressed, partially prestressed, and normal reinforced concrete beams. A parabolic variation of crack width from the level of longitudinal tensile steel to the tip of crack is assumed The principle of minimum (stationary) complementary strain energy is used to determine the depth of neutral axis and the inclination of shear cracks in the beam. Bond charaderistics between concretechord have and steel and the inclination of force in compression been considered. The effect of certain variables, such as stiffness of tension chord and degree of prestress on the forces carried by the web is studied using this method. A failure criterion based on the principle of maximum distortion energy is adopted to predict the ultimate load of beams failing in shear compression.