Factor for Taking into Account the Unloading of Soil Pressure
Technical Article
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.
Author
Dipl.-Ing. (FH) Paul Kieloch
Product Engineering & Customer Support
Mr. Kieloch provides technical support to our customers and is responsible for the development in the area of reinforced concrete structures.
Keywords
Foundation Base failure Contact pressure Punching through
Links
Write Comment...
Write Comment...
Contact Us
Do you have any further questions or need advice? Contact us via phone, email, chat or forum or find suggested solutions and useful tips on our FAQ page, available 24/7.
New
Parameterizing Models in RFEM 6/RSTAB 9
RFEM and RSTAB programs provide parameterized input as an advantageous product feature to create or adjust models by means of variables. This article will show you how to define global parameters and use them in formulas to determine numerical values.
-
How do I apply the ASCE 7 Orthogonal Directional Combination procedure (100% + 30% rule) to my seismic load in a static analysis?
- Is it possible in the CRANEWAY software to obtain the SLS rotational deformations of a continuous beam at the supports for an isostatic beam in the web plane?
- Why does the load wizard "Member Load from Area Load" give unnecessary concentrated loads?
- Why the eHORA map of Austria gives different snow loads than your Geo-Zone tool?
- How can I consider various wind profiles for various wind directions?
-
In the case of stairs with a complicated geometry, it is often difficult to design welds by using the analytical methods. How can I do this with RFEM?
- How can I carry out case-related design for different load situations?
Associated Products
RFEM 5
Main Program
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
Price of First License
3,540.00 USDRFEM 5
Add-on Module
Design of single, bucket, and block foundations
Price of First License
760.00 USDRSTAB 8
Main Program
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
Price of First License
2,550.00 USDRSTAB 8
Add-on Module
Design of single, bucket and block foundations
Price of First License
760.00 USD
Social Networks
Frequently Visited Pages
- Is it possible in the CRANEWAY software to obtain the SLS rotational deformations of a continuous beam at the supports for an isostatic beam in the web plane?
