Dimensioning of Longitudinal Reinforcement for Serviceability Limit State Design 1

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In the add-on modules RF-CONCRETE Members and CONCRETE and you have the option for "Dimensioning of Longitudinal Reinforcement for Serviceability Limit State". You can select the design criteria for the calculation of the longitudinal reinforcement.

The SLS designs to be performed according to EN 1992-1-1 include, for example:

  • Limitation of concrete stress σc according to 7.2 (1)
  • Limitation of steel stress σs according to 7.2 (4)
  • Minimum reinforcement min As according to 7.3.2 (2)
  • Limit diameter lim ds according to Table 7.2
  • Maximum rebar spacing lim sl according to Table 7.3
  • Limitation of crack width wk according to 7.3.1 (5) and 7.3.4
  • Limitation of deflection u according to 7.4

To fulfill the above -mentioned designs for stress limitation, minimum reinforcement, and crack width, you can select the increase of the required longitudinal reinforcement from the ultimate limit state. However, not all designs must always be fulfilled. So you can, for example, do without the design of concrete and steel stresses, if:

  • The internal forces have been determined according to the elasticity theory and not more than 15% have been shifted in the ULS design.
  • The rules according to Chapter 9 in Eurocode 2 have been observed.

By deactivating individual designs (for example the stress designs) in the "Serviceability limit state" tab, they are not taken into account in the reinforcement design to fulfill the serviceability limit state designs.

Part 2 describes the "Find the most economical reinforcement for crack width design" function.

Author

Dipl.-Ing. (FH) Alexander Meierhofer

Dipl.-Ing. (FH) Alexander Meierhofer

Head of Product Engineering Concrete & Customer Support

Mr. Meierhofer is the development leader of the programs for concrete structures and is available for the customer support team in the case of the questions related to reinforced and prestressed concrete design.

Keywords

Serviceability stress limitation Reinforcement

Reference

[1]   Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings; EN 1992-1-1:2011-01

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  • Updated 26 February 2021

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