You can select this option in "Options for Combinations" of "Combination Expressions".
Abandoning Snow for Wind as the Governing Action
According to DIN EN 1990/NA:2010‑12 - NDP to A.1.2.1(1) Comment 2, it is possible to neglect the combination of snow as a collateral action in cases of wind/snow combination with wind as the leading action in wind zones III and IV.
Author
Mr. Baumgärtel provides technical support for Dlubal Software customers.
Links
Do you have any questions?
Length: 00:00:35 min
Length: 00:00:52 min
Length: 00:00:00 min
Length: 00:00:00 min
Length: 00:01:57 min
Length: 00:00:31 min
Length: 00:01:00 min
For automatic load case combination in RFEM and RSTAB, you have to enter the possible interaction of load cases. In addition to the simultaneous or alternative occurrence of all load cases of an action, an option for different combination conditions is possible.
In addition to the basic combination rules of EN 1990, there are other combination conditions for actions on road bridges specified in EN 1991‑2 that must be taken into account. RFEM and RSTAB provide automatic combinatorics that can be activated in the General Data when selecting the standard EN 1990 + EN 1991‑2. The partial safety factors and combination coefficients depending on the action category are preset when selecting the respective National Annex.
The fundamental requirements of a structural system are (according to the basis of structural design) sufficient ultimate limit state, serviceability, and resistance. Structures must be designed in such a way that no damage occurs due to events such as the impact of a vehicle.
In addition to determining loads, some particularities concerning the load combinatorics in timber design have to be considered. Contrary to steel structures, where the largest loading results from all unfavorable actions, in timber construction, the strength values depend on the load duration and timber humidity. Special characteristics have to be considered as well for the serviceability limit state design. The following article discusses the effects on the design of wooden elements and how this is possible with RSTAB and RFEM.
Utilize all the options of the 'Edit Load Cases and Combinations' dialog box to facilitate your work. Here you can automatically create load and result combinations after selecting the corresponding combination expressions. In this clearly arranged dialog box, you can also e.g. to copy, add, or renumber load cases.
Additionally, control the load cases and combinations in Tables 2.1 – 2.6.
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)
Use the "Independent mesh preferred" option in the FE mesh settings to create an independent FE mesh for the integrated objects. This allows you to generate a significantly more detailed and precise FE mesh for individual objects that are integrated into one another.
In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.
I have used the RF‑/DYNAM Pro add-on module to generate the governing result combinations of seismic loads. What is the next procedure to perform the design of the individual structural components?
I design timber components. The deformations of the load combinations deviate from the manual calculation by exactly the coefficient of the material partial safety factor. Why?
How can I consider loads from the self-weight as "favorable" and "unfavorable" for the combinations?
For a specific combination expression, I would like to consider a load case with a combination coefficient that deviates from the standard. How can I proceed?
I have created automatic load combinations according to EN 1990 + 1995 (CEN). Although Ψ2,1 = 0, factors greater than zero are applied for wind and snow. Is this a program error?
I am using automatic combinations, but some load cases are not used in the generated combinations. How can I change this?
