Concrete Design | Punching Shear Design for Surfaces

Concrete Design

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Concrete Design for RFEM 6 | Punching through

Do you already know the Concrete Design add-on? In RFEM, it allows you to perform punching shear design checks for the surfaces with nodal, line, and surface supports (for example, foundation slabs). The add-on automatically determines the governing punching load from the specified loading – work that you will be spared of. This allows you to perform the punching shear design quickly and with a minimum of input.

The add-on for RFEM and RSTAB allows for design checks of members, member sets, and surfaces (only in RFEM). Display of a staircase with a center support and integrated upper and lower landing surfaces.

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Punching Shear Design of Slabs with Nodal, Line, and Surface Supports

Total items: 4

Display of the required punching shear reinforcement A-sw for concrete design in RFEM. Precise display of the reinforcement elements.

Concrete Design | Punching | Features

Import of relevant information and results from RFEM
Integrated, editable material and section library
Sensible and complete presetting of input parameters
Punching design on columns (all section shapes), wall ends, and wall corners
Automatic recognition of the punching node position from an RFEM model
Detection of curves or splines as a boundary of the control perimeter
Automatic consideration of all slab openings defined in the RFEM model
Construction and graphical display of the control perimeter
Optional design with unsmoothed shear stress along the control perimeter that corresponds to the actual shear stress distribution in the FE model
Determination of the load increment factor β via full-plastic shear distribution as constant factors according to EN 1992‑1‑1, Sect. 6.4.3 (3), based on EN 1992‑1‑1, Fig. 6.21N, or by a user‑defined specification
Numerical and graphical display of results (3D, 2D, and in sections)
Punching design of the slab without punching reinforcement
Qualitative determination of the required punching reinforcement
Design and analysis of the longitudinal reinforcement
Complete integration of results in an RFEM printout report

Configuration interface for the punching shear design of concrete in RFEM.

Concrete Design | Punching | Input

RFEM supports you and save you a lot of work. The materials and surface thicknesses defined in RFEM are already preset in the Concrete Design add-on. Thus, you can directly define the nodes to be designed.

Any openings in the area with risk of punching shear are automatically taken into account in the RFEM model. The add-on recognizes the position of the nodes of punching shear and automatically determines whether it is a node of punching shear in the center of the slab, on the edge of the slab, or in a slab corner. Again, you save your time.

You can individually select the method for determining the load increment factor β.

Punching shear calculation for reinforced concrete structures in RFEM 6 using graphics for design of internal forces.

Concrete Design | Punching | Design

You have two options in RFEM. On the one hand, you can determine the punching load from a single load (from column/loading/nodal support) and the smoothed or unsmoothed shear force distribution along the control perimeter. On the other hand, you can specify them as user-defined.

Calculate the design ratio of the punching shear resistance without punching reinforcement as a design criterion and the program will deliver you the corresponding result. In the case of exceeding the punching shear resistance without punching reinforcement, the program determines the required punching reinforcement as well as the required longitudinal reinforcement for you.

Concrete design using RFEM for punching shear design with v-Ed and v-Rd,c design ratio.

Required Punching Shear Reinforcement A-sw

Concrete Design | Punching | Results

Is the design completed? Then sit back. Because the punching checks are presented for you clearly and with all result details. This allows you to precisely follow each result. The program shows you the provided and allowable shear stresses for the shear resistance of the slab in detail.

RFEM has even more to offer in this add-on. In the next result window, it lists the required longitudinal or punching reinforcement of each analyzed node. You can also find an explanatory graphic there. RFEM shows you the design results clearly displayed with values in the work window. You can integrate all result tables and graphics into the global printout report of RFEM. Thus, you can be sure of a clear documentation.