Factor for Taking into Account the Unloading of Soil Pressure
In RF-/FOUNDATION Pro, the user can freely select the proportion of the relieving soil pressure by means of the factor kred.
According to DIN EN 1992‑1‑1, the sum of the soil pressures within the punching cone may be assumed as having an unloading effect of 100% if the critical perimeter in the punching shear design of the foundation slab is determined iteratively. If, to simplify the calculation, the constant control perimeter is taken at a distance of 1.0 d, 50% of the sum of the soil pressures within the constant control perimeter may be assumed as having an unloading effect.
In the "Details" section, this is taken into account by the factor kred. If you select the "Iterated calculation of the control perimeter" option, the value for kred is taken as 1.00. If the "Definition of Distance ..." is selected, the value for kred is set to 0.50. You can, however, also specify a user‑defined value. You can also, for example, select the iterative calculation and specify 0.5 for kred.
In the design details for the punching design, you get the value for delta VEd, which was determined under consideration of the factor kred.
Dipl.-Ing. (FH) Paul Kieloch
Product Engineering & Customer Support
Mr. Kieloch provides technical support to our customers and is responsible for development in the area of reinforced concrete structures.
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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids, and contact elements
Design of single, bucket, and block foundations
Structural engineering software for designing frame, beam, and truss structures, as well as performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Design of single, bucket and block foundations