General information on HALFEN-DEHA punching shear reinforcement

Module(s): HALFEN-DEHA

You can use this module to transfer the existing geometry and, if necessary, the required structural reinforcement from the CAD system to HALFEN DEHA’s calculation program, which analyzes punching shear after you have entered all the necessary data. You can then re-import the results into the CAD system and place the required studrails as fixtures. The fixtures placed can be labeled and listed in a report later.

You can use intelligent smart fixture symbols, which are associated with the article master data, for graphical, on-screen display and analyses in lists/schedules.

Creating a data record

Specify a reference point at which you want to calculate punching shear. Allplan creates a data record in which the reference point specified is the origin of a local coordinate system.
Then Allplan scans a specific area defined around this point for data that is required for calculating punching shear (e.g. openings, slab edges, columns, supporting forces and reinforcement results of FEA calculations, ...) and saves this data in a file.

Supporting forces for point and line supports are only transferred to HALFEN DEHA's calculation program when several load cases have been calculated in the FEA program and thus minimum and maximum values exist. HALFEN DEHA's calculation program ignores values of single load cases.
If there are values of single load cases only, the supporting forces will not be transferred.

In the case of line support reactions, please note that the values are only transferred to HALFEN DEHA's calculation program when there is an associated architectural wall.
If, for example, you export the data with one FEA drawing file only, the reaction forces are not transferred to HALFEN DEHA although they are included in the data record created.

The area around the punching point is defined by a circle having a diameter of 12 times the slab thickness. The value used for the slab thickness depends on the existing geometry.

• If an architectural slab exists and if this slab is within the area of the punching point, which is defined by a standard circle of 180 mm diameter around the punching point, Allplan uses the thickness of this slab. Otherwise, a default value of 180 mm is used.
• If a FEA calculation is available (with or without architectural slab), the slab thickness of this FEA calculation is used. If this FEA calculation does not include a slab thickness, Allplan uses the default value of 180 mm and issues a message.
  The slab thickness of this FEA calculation is used in HALFEN DEHA's calculation program.
• If neither an architectural slab nor a FEA calculation exists, Allplan uses the default value of 180 mm.

Calculating punching shear

The available options vary depending on the selected function:

• After the data record has been created, HALFEN DEHA's calculation program starts immediately and imports the data automatically. As soon as you have entered additional data, which could not be derived from the CAD data, punching shear is calculated. The results are saved in the file.
• The data record can be exported later and imported into HALFEN DEHA's program, calculated and saved again, independently of the operations in the CAD system.
  This way, a designer can create a file without results and then transfer it to the structural engineer who calculates the data.
• You do not need any CAD data to calculate punching shear in HALFEN DEHA's program and save the results to a special file.
  This way, the structural engineer can calculate punching shear, save the results and send them to the designer (e.g. data exchange via Internet).

Creating punching shear reinforcement

The available options vary depending on the selected function:

• The data record is automatically saved with the results of the calculation and imported into the CAD system. Based on the parameter values, Allplan determines the type of fixture required and places it as specified in the area around the reference point.
• You can import a file from HALFEN DEHA's calculation program, switch to the CAD system and define a reference point where punching shear reinforcement is to be arranged. Based on the parameter values, Allplan determines the type of fixture required and places it as specified in the area around the reference point.
• You do not need any data records to select and place fixtures. All you need to do is select the relevant fixtures from the fixtures catalog.

Note: If you perform an additional calculation for a punching point you have already calculated, Allplan will not automatically update existing reinforcement contour lines and FEA reinforcement color images when you import the results again.
In this case, you need to delete the contour lines and display them again using the Reinforcement Contours tool. In addition, open the FEA Reinforcement Color Image tool, set the Update Display option to Off and create the color images again.