Determining the critical surface
The top surface (-z) proves to be the critical surface. For further calculations, only the bending moment and the axial force of this surface are considered.
2 Theoretical Background
- 2.1 Type of Model
- 2.2 Design of 1D and 2D Structural Components
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2.6 Serviceability
- 2.6.1 Design Internal Forces
- 2.6.2 Principal Internal Forces
- 2.6.3 Provided Reinforcement
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2.6.4 Serviceability Limit State Designs
- 2.6.4.1 Input data for the example
- 2.6.4.2 Check of principal internal forces
- 2.6.4.3 Required reinforcement for ULS
- 2.6.4.4 Specification of a reinforcement
- 2.6.4.5 Check of provided reinforcement for SLS
- 2.6.4.6 Selection of concrete compression strut
- 2.6.4.7 Limitation of concrete compressive stress
- 2.6.4.8 Limitation of reinforcing steel stress
- 2.6.4.9 Minimum reinforcement for crack control
- 2.6.4.10 Check of rebar diameter
- 2.6.4.11 Design of bar spacing
- 2.6.4.12 Check of crack width
- 2.6.5 Governing Loading
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2.7 Deformation Analysis with RF-CONCRETE Deflect
- 2.7.1 Material and Geometry Assumptions
- 2.7.2 Design Internal Forces
- 2.7.3 Critical Surface
- 2.7.4 Cross-Section Properties
- 2.7.6 Distribution Coefficient
- 2.7.7 Cross-Section Properties for Deformation Analysis
- 2.7.8 Material Stiffness Matrix D
- 2.7.9 Positive Definiteness of Material Stiffness Matrix
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2.7.10 Example
- 2.7.10.1 Geometry
- 2.7.10.2 Materials
- 2.7.10.3 Selection of internal design forces
- 2.7.10.4 Determining the critical surface
- 2.7.10.5 Cross-section properties (cracked and uncracked state)
- 2.7.10.6 Shrinkage influence
- 2.7.10.7 Calculation of distribution coefficient
- 2.7.10.8 Final cross-section properties
- 2.7.10.9 Stiffness matrix of the material
2.7.10.4 Determining the critical surface
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