In RFEM, it is often necesaary to only load a part of a surface, not the entire surface. A typical case of this is soil pressure. For this purpose, there is the option of defining free surface loads. They are surface-independent and are displayed in defined coordinate dimensions in the graphic.
KB 000865 | Displaying Intersection of Free Surface Loads
The results of solid stresses can be displayed as colored 3D points in the finite elements.
If the check box 'Number of load increments' is deactivated, the number of load increments will be determined automatically in RFEM to solve nonlinear tasks efficiently.
The method used is based on a heuristic algorithm.
With this function, it is possible to refine the FE mesh on surfaces automatically. The mesh refinement is gradual. In each step, the FE mesh is recreated based on an error comparison of the results in the previous calculation step. The numerical error is evaluated from the results of surface elements and is based on the energy formulation of Zienkiewicz-Zhu.
The error evaluation is carried out for a linear static analysis. We select a load case (or load combination) for which the FE mesh is generated. The FE mesh is then used for all calculations.
The Base Data dialog box includes a wide range of standards and the option to create combinations automatically. The following standards are available:
- EN 1990:2002
- EN 1990 + EN 1995:2004 (Timber)
- EN 1990 + EN 1991-2; Road bridges
- EN 1990 + EN 1991-3; Cranes
- EN 1990 + EN 1997
- to DIN 1055-100:2001-03
- DIN 1055-100 + DIN 1052:2004-08 (timber)
- DIN 1055-100 + DIN 18008 (Glass)
- DIN 1052 (simplified) (timber)
- DIN 18800:1990
- ASCE 7‑10
- ASCE 7-10 NDS (Wood)
- ACI 318-14
- IBC 2015
- CAN/CSA S 16.1-94:1994
- NBCC: 2005
- NBR 8681
- IS 800:2007
- SIA 260:2003
- SIA 260 + SIA 265:2003 (timber)
- BS 5950-1:2000
- GB 50009-2012
- CTE DB-SE
For the European standards (EC), the following National Annexes are available:
- DIN EN 1990/NA:2009-05 (Germany)
- NBN EN 1990 - ANB: 2005 (Belgium)
- BDS EN 1990:2003/NA:2008 (Bulgaria)
- DK EN 1990/NA:2007-07 (Denmark)
- SFS EN 1990/NA:2005 (Finland)
- NF EN 1990/NA:2005/12 (France)
- ELOT EN 1990:2009 (Greece)
- UNI EN 1990/NA:2007-07 (Italy)
- IS EN 1990:2002 + NA:2010 (Ireland)
- LVS EN 1990:2003/NA:2010 (Latvia)
- LST EN 1990/NA:2010-11 (Lithuania)
- LU EN 1990/NA:2011-09 (Luxembourg)
- MS EN 1990:2010 (Malaysia)
- NEN EN 1990/NA:2006 (Netherlands)
- NS EN 1990/NA:2008 (Norway)
- ÖNORM EN 1990:2007-02 (Austria)
- NP EN 1990:2009 (Portugal)
- PN EN 1990/NA:2004 (Poland)
- SR EN 1990/NA:2006-10 (Romania)
- SIST EN 1990: 2004/A1:2005 (Slovenia)
- SS EN 1990:2008 (Singapore)
- SS EN 1990/BFS 2010:28 (Sweden)
- STN EN 1990/NA:2009-08 (Slovakia)
- UNE EN 1990 2003 (Spain)
- CSN EN 1990/NA:2004-03 (Czech Republic)
- BS EN 1990/NA:2004-12 (the United Kingdom)
- TKP EN 1990/NA:2011 (Belarus)
- CYS EN 1990:2002 (Cyprus)