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2024-06-04

Fire Design of Slabs and Walls According to Simplified Table Method

In the Concrete Design add-on for RFEM 6, you can perform the fire design of reinforced concrete slabs and walls according to the simplified table method (EN 1992‑1‑2, Section 5.4.2 and Tables 5.8 and 5.9).

Feature 002828 | Fire resistance design for slabs and walls using the simplified table method
Fire Resistance Design for Surfaces in RFEM
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Illustration of a method for performing stability analysis according to DIN EN 1992-1-1 in RFEM 6
For reinforced concrete components and structures with structural behavior considerably influenced by the effects of the second-order analysis, Eurocode 2 provides the general method based on a nonlinear determination of internal forces according to the second-order analysis (5.8.6), as well as the approximation method based on the nominal curvature (5.8.8).

The aim of this technical article is to perform a design according to the general design method of Eurocode 2, using the example of a slender reinforced concrete column.
Modell eines Stahlbetonbalkens, der durch Kriechen und Schwinden beeinflusst wird
This technical article addresses the direct deformation analysis of reinforced concrete beams considering the long-term effects of creep and shrinkage. The direct calculation according to Eurocode 2 (EN 1992-1-1, Section 7.4.3) is explained using a single-span beam. Particular emphasis is placed on tension stiffening, behavior in the cracked state based on the distribution factor (damage parameter), and consideration of shrinkage and creep behavior.
Design Level 1 – Ultimate Configuration
The fatigue design according to EN 1992-1-1 must be performed for the structural components subjected to large stress ranges and/or many load changes. In this case, the design checks for the concrete and the reinforcement are performed separately. There are two alternative design methods available.
Spans Based on Figure 5.2 from [1]
In order to correctly design a downstand beam or a T-beam in RFEM 6 using the Concrete Design add-on, it is essential to determine the flange widths for the rib members. This article describes the input options for a two-span beam and the calculation of the flange dimensions according to EN 1992-1-1.
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Feature 002691 | Simplified fire resistance design for columns according to 5.3.2 and for beams according to 5.6, EN 1992-1-2

In the Concrete Design add-on, you can perform the simplified fire resistance design according to Sections 5.3.2 and 5.6 of EN 1992‑1‑2 for columns and beams.

The following design checks are available for the simplified fire resistance design:

  • Columns: Minimum cross-sectional dimensions for rectangular and circular sections according to Table 5.2a as well as Equation 5.7 for calculating time of fire exposure
  • Beams: Minimum dimensions and center distances according to Tables 5.5 and 5.6

You can determine the internal forces for the fire resistance design according to two methods.

  • 1 Here, the internal forces of the accidental design situation are included directly into the design.
  • 2 The internal forces of the design at normal temperature are reduced by the factor Eta,fi (ηfi), then used in the fire resistance design.

Furthermore, it is possible to modify the axis distance according to Eq. 5.5.

Feature 002670 | Fatigue Design According to EN 1992-1-1, Chapter 6.8

With the Concrete Design add-on, you can perform the fatigue design of members and surfaces according to EN 1992‑1‑1, Chapter 6.8.

For the fatigue design, you can optionally select two methods or design levels in the design configurations:

  • Design Level 1: Simplified design according to 6.8.6 and 6.8.7(2): The simplified design is performed for frequent action combinations according to EN 1992‑1‑1, Chapter 6.8.6 (2), and EN 1990, Eq. (6.15b) with the traffic loads relevant in the serviceability state. A maximum stress range according to 6.8.6 is designed for the reinforcing steel. The concrete compressive stress is determined by means of the upper and lower allowable stress according to 6.8.7(2).
  • Design Level 2: Design of damage equivalent stress acc. to 6.8.5 and 6.8.7(1) (simplified fatigue design): The design using damage equivalent stress ranges is performed for the fatigue combination according to EN 1992‑1‑1, Chapter 6.8.3, Eq. (6.69) with the specifically defined cyclic action Qfat.
Feature 002671 | Seismic Design of Reinforced Concrete Members According to EC 8

The Concrete Design add-on allows you to perform the seismic design of reinforced concrete members according to EC 8. This includes, among other things, the following functionalities:

  • Seismic design configurations
  • Differentiation of the ductility classes DCL, DCM, DCH
  • Option to transfer the behavior factor from a dynamic analysis
  • Check of the limit value for the behavior factor
  • Capacity design checks of "Strong column - weak beam"
  • Detailing and particular rules for curvature ductility factor
  • Detailing and particular rules for local ductility
Feature 002654 | Design of Fiber-Reinforced Concrete

In the Concrete Design add-on, you can design structural components made of fiber-reinforced concrete according to the guideline DAfStb Steel Fiber-Reinforced Concrete.

You can use this option for the design according to EN 1992‑1‑1. The design according to the DAfStb guideline is carried out once the concrete of the "Fiber Concrete" type has been assigned to the reinforced structural component.

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Frequently Asked Questions (FAQ)
Is it possible to view the tangential and radial analysis results and reinforcement requirements rather than orthogonal for a circular slab?
How can I use graphic templates for multi printing of a reinforcement?

How can I activate the design with steel-fiber-reinforced concrete in the "Concrete Design" add-on for RFEM 6?
How can I check the way RFEM 6 determines the required reinforcement?
Although all the member design checks have been fulfilled, I get the "Not Covered Reinforcement" result. What is the reason?
Where can I find the graphical results of punching shear in the concrete design? Especially the distribution of shear forces at the critical perimeter or the punching loads.
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