2630x

2021-03-24

Documentation of Applied Shear Force for Shear Design

For uniformly distributed loading according to EN 1992‑1‑1 (Eurocode 2), the design section for the shear reinforcement can be placed at the distance d from the front edge of the support. Thus for the shear reinforcement, the applied shear force is reduced to V_Ed,red. To analyze the maximum design shear resistance V_Rd,max, however, the total shear force is applied.

To achieve complete documentation of the applied shear forces, the total shear force V_Ed as well as the reduced shear force V_Ed,red are displayed in the design details or graphically.

In the design details of Window 3.3, the shear resistance ratios of the reinforced cross-section are listed below:

V_{Ed, red}/V_{Rd, c}
V_{Ed, red}/V_{Rd, s}
V_Ed/V_{Rd, max}

V_Ed... Shear force effect
V_{Ed, red}... Reduced shear force
V_{Rd, c}... Shear force resistance without shear reinforcement
V_{Rd, s}... Shear force resistance with shear reinforcement
V_{Rd, max}... Maximum shear force resistance of the concrete compression strut

You can also display the utilization ratios graphically as a result diagram and add it to the documentation.

Graphical Display of Full / Reduced Shear Force and Required Shear Reinforcement

Graphical Display of Shear Force Ratio

Reinforced Concrete Beam

Author

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

Links

Structural Analysis and Design Software for Concrete Structures

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$Steel Structures in RFEM 6 \n Part 2: Combinations, Design, Documentation$

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Videos

Knowledge Base

KB 000715 | Documentation of Applied Shear Force for Shear Design

Length: 00:01:39 min

Knowledge Base

KB 000913 | Fire Resistance Design for Reinforced Concrete Members

Length: 00:00:46 min

Knowledge Base

KB 000889 | Minimum Reinforcement Reduction of Slow-Curing Concrete

Length: 00:00:51 min

Knowledge Base

KB 000651 | Subsequent Editing of Reinforcement Proposal

Length: 00:01:09 min

Knowledge Base

KB 000655 | Determining Required Longitudinal Reinforcement for Shear Force Design According to EN 1992-1-1

Length: 00:00:29 min

Knowledge Base

KB 000566 | Design of Foundations

Length: 00:00:37 min

Knowledge Base

KB 000491 | Defining Stirrup Spacing

Length: 00:00:56 min

Knowledge Base

KB 000505 | Dimensioning of Longitudinal Reinforcement for Serviceability Limit State Design 1

Length: 00:00:42 min

Knowledge Base

KB 000506 | Dimensioning of Longitudinal Reinforcement for Serviceability Limit State Design 2

Length: 00:00:47 min

Models to Download

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Model 004786 | Office Building with Integrated Visitors' Center and Parking Garage in Geiselbulach, Germany

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Office Building with Integrated Visitor Center and Parking Garage in Geiselbulach, Germany

Knowledge Base Articles

Fire Resistance Design with CONCRETE and RF-CONCRETE Members

The reinforced concrete design for fire situations is carried out according to the simplified method based on EN 1992-1-2, Clause 4.2. The "zone method" described in Annex B.2 is used: The cross-section is subdivided into a number of parallel zones of equal thickness, and their temperature-dependent compressive strength is determined. The reduced load-bearing capacity in the event of fire exposure is thus represented by a reduced structural component's cross-section with reduced strengths.

Minimum Reinforcement Reduction of Slow-Curing Concrete

In the case of using slow‑curing concrete (usually for thick components), you can reduce the calculated minimum reinforcement by a factor of 0.85 to apply the load due to restraint, according to EN 1992‑1‑1, Section 7.3.2. However, a precondition for reduction is that the characteristic value of the strength development r = f_cm2 / f_cm28 does not exceed 0.3. Other key requirements for the application of this reinforcement reduction are specified explicitly in the final planning documents.

Subsequent Editing of Reinforcement Proposal

RF-CONCRETE Members for RFEM or CONCRETE for RSTAB propose an automatically created reinforcement to the user if the "Design the provided reinforcement" option is selected in Window 1.6 "Reinforcement".

Screenshots

Graphical Display of Full / Reduced Shear Force and Required Shear Reinforcement

Graphical Display of Shear Force Ratio

Reinforced Concrete Beam

Reduced Cross-Section and Temperature Course

Design of Sets of Members

Jump in Deformation Diagram

Detailed Results not Available

Detailed Results Available

Steel Schedule in RF-CONCRETE Columns

Product Features

Transfer of Reinforcement from RFEM/RSTAB (Top) to Revit (Bottom)

The reinforcement proposal from RF-/CONCRETE Members can be exported to Revit. The rectangular and circular cross-sections are currently supported.

The reinforcement bars can be modified retroactively in Revit.

Feature 002801 | Punching Shear Design for All Section Shapes

Do you have individual column sections and angled wall geometries, and need punching shear design for them?

No problem. In RFEM 6, you can perform punching shear design not only for rectangular and circular sections, but for any cross-section shape.

Feature 002722 | Sensitivity Coefficient

For a response spectrum analysis of building models, you can display the sensitivity coefficients for the horizontal directions by story.

These key figures allow you to interpret the sensitivity to stability effects.

Feature 002720 | Modal Relevance Factor for Stability Analysis

The modal relevance factor (MRF) can help you to assess to which extent specific elements participate in a specific mode shape. The calculation is based on the relative elastic deformation energy of each individual member.

The MRF can be used to distinguish between local and global mode shapes. If multiple individual members show significant MRF (for example, > 20%), the instability of the entire structure or a substructure is very likely. On the other hand, if the sum of all MRFs for an eigenmode is around 100%, a local stability phenomenon (for example, buckling of a single bar) can be expected.

Furthermore, the MRF can be used to determine critical loads and equivalent buckling lengths of certain members (for example, for stability design). Mode shapes for which a specific member has small MRF values (for example, < 20%) can be neglected in this context.

The MRF is displayed by mode shape in the result table under Stability Analysis → Results by Members → Effective Lengths and Critical Loads.

Frequently Asked Questions (FAQ)

I obtain different results when comparing the deformation analysis in the RF‑CONCRETE add-on modules and another calculation program. What could be the reason for this?

For the design, I can only select the surrounding reinforcement for a rectangular cross-section. Why?

I recently purchased RSTAB with the CONCRETE add-on module. Can I use it to perform the stability analysis of reinforced concrete columns?

Why do RF‑CONCRETE Members and CONCRETE determine a significantly higher provided reinforcement than the required reinforcement?

When calculating deformations in RF‑CONCRETE Members, I see inconsistencies in the deflection diagram. Why?

Why can I no longer display the intermediate results in RF‑CONCRETE Members?

Customer Projects

Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany

Front View of Office Building with V-Shaped Steel Composite Columns | © Die Tragwerker GmbH

Office Building with Integrated Visitor Center and Parking Garage in Geiselbulach, Germany

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Reinforced Concrete Elevator Shaft at Montluçon Station, France

New Concert Hall in La Roche-sur-Yon, France

Residential Buildings in Trieste, Italy

Deformations of Airedale Swing Bridge in RFEM

Airedale Swing Bridge in Rodley, United Kingdom

Deformations in RFEM | © Baumruck + Oswald

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