Answer:
When displaying punching loads by means of a shear force at the critical perimeter, RFEM has recourse to the internal sections. In this case, the critical perimeter is automatically subjected to internal division. Thus, the result values are determined on each FE mesh node and on the internal division points. In the Display navigator, you can either display all values for the sections or only the extreme value. Therefore, a rough division or output of the values cannot be set.
Question
Is it possible to reduce the display or the number of result values in the critical perimeter?
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In RF-PUNCH Pro, you can perform the punching shear design on wall corners and wall ends. The basis for the design is the punching load, which is automatically determined from the RFEM internal forces in the connected surface. Since the surface internal forces from the RFEM calculation may be subject to the influence of singularity locations, this can also have a negative influence on the determined punching load at the wall corner or end. This article describes possible optimization options that you can use to minimize this unfavorable influence.
In RF-PUNCH Pro, enlarged column heads can be arranged at point-supported punching shear points, thus increasing the shear force resistance of a reinforced concrete floor. In the following article, we will show the punching shear design with the optional application of an enlarged column head.
RF-PUNCH Pro performs punching shear design on concentrated load application locations (column connection, nodal support, and nodal load) as well as on wall ends and wall corners.
With RF-PUNCH Pro, the punching shear design can be performed according to 6.4, EN 1992-1-1. In the following example, the design according to DIN EN 1992-1-1 will be presented first with automatic design of the inner and outer perimeters and then on the basis of the inner perimeters defined by the user on a simple example.
![Dialog Box "Edit Wall" with Specification of Width "t" in [mm]](/en/webimage/019339/3371420/faq4637-02-en-us.png?mw=350&hash=12b1e89932c586ce4252df4a31c61a3d2219ef62)
The punching load can be determined from a single load (from column/loading/nodal support) and the smoothed or unsmoothed shear force distribution along the control perimeter, or it can be defined by the user.
Since the module is fully integrated in RFEM, all nodes of punching shear on the reference surface are known. Therefore, you can check for collision of the determined perimeters with those of the neighboring columns.
After opening the module, the materials and surface thicknesses defined in RFEM are preset. The nodes to be designed are automatically recognized but can also be modified by the user.
It is possible to consider openings in the area with risk of punching shear. The openings can be transferred from RFEM or specified only in RF‑PUNCH Pro so they do not effect the stiffnesses of the RFEM model.
The parameters of the longitudinal reinforcement are the number and direction of the layers and the concrete cover, specified separately for the top and bottom of the slab on a surface-by-surface basis.
The next input window allows you to define all additional details for nodes of punching shear.
The module recognizes the position of the punching node and automatically sets, whether the node is located in the center of the slab, on the slab edge or in the slab corner.
In addition, it is possible to set punching load, load increment factor β, and the existing longitudinal reinforcement. Optionally, the minimum moments can be activated for determining the required longitudinal reinforcement and enlarged column head.
To facilitate orientation, a slab is always displayed with the corresponding node of punching shear. You can also open the design program by HALFEN, a German producer of shear rails. All RFEM data can be imported to this program for further easy and effective processing.
- Import of relevant information and results from RFEM
- Integrated, editable material and section library
- The module extension EC2 for RFEM enables the design of reinforced concrete members according to EN 1992‑1‑1:2004 (Eurocode 2) and the following National Annexes:
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DIN EN 1992-1-1/NA/A1:2015-12 (Germany) -
ÖNORM B 1992-1-1:2018-01 (Austria) -
NBN EN 1992-1-1 ANB:2010 (Belgium) -
BDS EN 1992-1-1:2005/NA:2011 (Bulgaria) -
EN 1992-1-1 DK NA:2013 (Denmark) -
NF EN 1992-1-1/NA:2016-03 (France) -
SFS EN 1992-1-1/NA:2007-10 (Finland) -
UNI EN 1992-1-1/NA:2007-07 (Italy) -
LVS EN 1992-1-1:2005/NA:2014 (Latvia) -
LST EN 1992-1-1:2005/NA:2011 (Lithuania) -
MS EN 1992-1-1:2010 (Malaysia) -
NEN-EN 1992-1-1+C2:2011/NB:2016 (Netherlands) - NS EN 1992-1 -1:2004-NA:2008 (Norway)
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PN EN 1992-1-1/NA:2010 (Poland) -
NP EN 1992-1-1/NA:2010-02 (Portugal) -
SR EN 1992-1-1:2004/NA:2008 (Romania) -
SS EN 1992-1-1/NA:2008 (Sweden) -
SS EN 1992-1-1/NA:2008-06 (Singapore) -
STN EN 1992-1-1/NA:2008-06 (Slovakia) -
SIST EN 1992-1-1:2005/A101:2006 (Slovenia) -
UNE EN 1992-1-1/NA:2013 (Spain) -
CSN EN 1992-1-1/NA:2016-05 (Czech Republic) -
BS EN 1992-1-1:2004/NA:2005 (United Kingdom) -
TKP EN 1992-1-1:2009 (Belarus) -
CYS EN 1992-1-1:2004/NA:2009 (Cyprus)
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In addition to the National Annexes (NA) listed above, you can define a specific NA, applying user‑defined limit values and parameters.
- Sensible and complete presetting of input parameters
- Punching design on columns, wall ends, and wall corners
- Optional arrangement of an enlarged column head
- Automatic recognition of the position of the punching node from the RFEM model
- Detection of curves or splines as boundary of the control perimeter
- Automatic consideration of all slab openings defined in the RFEM model
- Structure and graphical display of the control perimeter before calculation starts
- Qualitative determination of punching shear reinforcement
- 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 user‑defined specification
- Integration of design software by Halfen, a producer of shear rails
- Numerical and graphical display of results (3D, 2D, and in sections)
- Punching shear design with or without punching shear reinforcement
- Optional consideration of minimum moments according to EN 1992‑1‑1 when determining longitudinal reinforcement
- Design or analysis of longitudinal reinforcement
- Complete integration of results in the RFEM printout report
After the design, the punching checks are presented clearly and with all result details, so that traceability is guaranteed at all times. The provided and allowable shear stresses for the shear resistance design of a slab as well as various perimeters and reinforcement ratios are represented in detail. If necessary, a clarifying note is displayed.
The next result window lists the required longitudinal or punching reinforcement of each analyzed node. An explanatory graphic is also available. The design results can be clearly displayed with values in the work window. Furthermore, you can add all result tables and graphics into the global printout report of RFEM, which guarantees coherent documentation.
I have installed Halfen HDB 13.60 on my PC. The version does not seem to be compatible with RF‑PUNCH Pro anymore. The interface does not work. I am using version 5.26.02 of RFEM.
What defines the dimensions "Length of Reinforcement" and "Width of Reinforcement" of the longitudinal reinforcement in RF‑PUNCH Pro? Is the anchorage length included?
Where in RF‑PUNCH Pro is the direction of the individual reinforcement layers displayed?
When should the punching load be determined with the (un)smoothed distribution of the shear forces at the critical perimeter?
How can I graphically display the determined load increasing factors ß from the RF‑PUNCH Pro calculation?
I would like to perform punching shear design on a column with downstand beams as a wall corner or wall end. However, the module applies an internal column. Is it possible to adjust it?
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