ANALYTICAL LOAD-BEARING CAPACITY’S DETERMINATION OF REINFORCED CONCRETE BEAMS BY DIFFERENT "STRESS-STRAIN" DEPENDENCIES

Abstract

The article presents a comparative analysis of methods for determining the load-bearing capacity of reinforced concrete beams (second design task), based on the deformation approach according to current standards of calculation DBN B.2.6-98: 2009 "Concrete and reinforced concrete structures. Substantive provisions". The results of determining the maximum value of the bending moment in the Mu beam by five methods based on the use of a curvilinear diagram of "stress-strain" (nonlinear deformation model of Bambura A.M., new deformation model of Pavlikov A.M., deformation-force model Romashko V.M.), simplified bilinear diagram of "stress-strain" (Popov V.O., Wojciechivski O.V.) as well as a simplified rectangular form of «stress-strain» diagram (Babayev V.M., Bambura A.M., Pustovoitova O.M., etc.). It is shown that the calculation of bearing capacity for all these methods differs from the normative according to DBN and DSTU [1, 2] within 1%. In this case, according to the author, the simplest in terms of engineering use and interpretation of the implemented algorithm is a rectangular dependence, and the most complex is the method of deformation-force model Romashko V.M.