Design of RC Sections in the Ultimate Limit State Under Bending and Axial Force According To Ec2

Abstract eng:
In the imminent future the design of concrete structures in Europe will be governed by the application of Eurocode 2 (EC2). In particular, EC2 – Part 1-1 [1] deals with the general rules and rules for concrete buildings. An important aspect of the design is specifying the necessary tensile (and compressive, if needed) steel reinforcement required for a Reinforced Concrete (RC) section, in order to ensure that the RC member will be able to resist the design loads. According to EC2-Part 1-1 three different simplified diagrams for the stress-strain behavior of concrete for RC sections design can be assumed: (a) the equivalent rectangular stress block, (b) the parabolic-rectangular stress-strain relation and (c) the bi-linear stress-strain relation as a simplification of the parabolic-rectangular case. In this study the three approaches suggested by EC2-Part 1-1 are investigated for the design of rectangular RC crosssections with tensile steel reinforcement to resist loading due to bending moment and axial force. The tensile strength of concrete is neglected and concrete is supposed to work only in compression. For each case analytical relations are extracted in detail with a step-by-step detailed procedure, the relevant assumptions are highlighted and results for four beam design examples are finally presented.

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