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
As technical support, Mr. Kieloch answers the questions of Dlubal Software customers, and is responsible for the development of the add-on modules for reinforced concrete structures.
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The calculation of complex structures by means of finite element analysis software is generally performed on the entire model. However, the construction of such structures is a process carried out in multiple stages where the final state of the building is achieved by combining the separate structural parts. To avoid errors in the calculation of overall models, the influence of the construction process must be considered. In RFEM 6, this is possible by using the Construction Stages Analysis (CSA) add-on.
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Compared to the RF-/STEEL EC3 add-on module (RFEM 5/RSTAB 8), the following new features have been added to the Steel Design add-on for RFEM 6 / RSTAB 9:
- In addition to Eurocode 3, other international standards are integrated (e.g. AISC 360, CSA S16, GB 50017, SP 16.13330)
- Consideration of hot-dip galvanizing (DASt guideline 027) in the fire protection design according to EN 1993-1-2
- Input option for transverse stiffeners that can be taken into account in the shear buckling analysis
- Lateral-torsional buckling can also be checked for hollow sections (e.g. relevant for slender, high rectangular hollow sections)
- Automatic detection of members or member sets valid for the design (e.g. automatic deactivation of members with invalid material or members already contained in a set of members)
- Design settings can be adjusted individually for each member
- Graphical display of the results in the gross section or the effective section
- Output of the used design check formulas (including a reference to the used equation from the standard)
- How can I optimize cross-sections within the steel design?
- What is the meaning of the two terms "Factorize provided reinforcement" and "Optimize provided reinforcement" in the concrete design?
- Can I switch the required reinforcement in the result tables from "mesh nodes" to "grid points?"
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How do I apply wind load on members of open structures?
- Is it also possible to use RF‑/TOWER Loading without the other TOWER add-on modules?
- I do not want to design a cross-section in the RF‑/STEEL EC3 add-on module. Can I quickly remove this cross-section from the selection?
- I have a roof structure resting on a steel column that runs to the foundations. The column runs through a perimeter wall that supports the false ceiling. A considerable part of the load from the roof is transferred to the wall. I want the steel column to carry all the vertical loads from the roof. How can I do it?
- Are the models and presentations from Info Day 2018 freely available, and can you send them to me?
- I encountered a sharing violation while importing a dxf file into SHAPE-THIN. What is the issue?
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
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Design of single, bucket and block foundations