You have the option to perform the fire resistance design of surfaces using the reduced cross-section method. The reduction is applied over the surface thickness. It is possible to perform the design checks for all timber materials allowed for the design.
For cross-laminated timber, depending on the type of adhesive, you can select whether it is possible for individual carbonized layer parts to fall off, and whether you can expect increased charring in certain layer areas.
The design of cold-formed steel members according to the AISI S100-16 / CSA S136-16 is available in RFEM 6. Design can be accessed by selecting “AISC 360” or “CSA S16” as the standard in the Steel Design Add-on. “AISI S100” or “CSA S136” is then automatically selected for the cold-formed design.
RFEM applies the Direct Strength Method (DSM) to calculate the elastic buckling load of the member. The Direct Strength Method offers two types of solutions, numerical (Finite Strip Method) and analytical (Specification). The FSM signature curve and buckling shapes can be viewed under Sections.
A wide range of cross-sections, such as rectangular sections, square sections, T‑sections, circular sections, built-up cross-sections, irregular parametric cross-sections, and many others (suitability for design depends on the selected standard)
Design of cross-laminated timber (CLT)
Design of timber-based materials and laminated veneer lumber according to EC 5
Design of tapered and curved members (design method according to the standard)
Adjustment of the essential design factors and standard parameters is possible
Flexibility due to detailed setting options for basis and extent of calculations
Fast and clear results output for an immediate overview of the result distribution after the design
Detailed output of the design results and essential formulas (comprehensible and verifiable result path)
Numerical results clearly arranged in tables and graphical display of the results in the model
Integration of the output into the RFEM/RSTAB printout report
Did you use the eigenvalue solver of the add-on to determine the critical load factor within the stability analysis? If so, you can then display the governing mode shape of the object to be designed as a result. The eigenvalue solver is available here for the lateral-torsional buckling analysis, depending on the design standard used.
If your design is successful, the relaxed part of your work follows. Because the program does many processes for you. For example, the performed design checks are displayed in a table. It shows you all the result details. Due to the clearly presented design formulas, you will be able to understand the results without any problems. There is no "black box" effect here.
The design checks are carried out at all governing locations of the members and displayed graphically as a result diagram. Furthermore, detailed graphics, such as the stress distribution on a cross-section or the governing mode shape, are available for you in the result output.
All input and result data are part of the RFEM/RSTAB printout report. You can select the report contents and extent specifically for the individual design checks.
Wind loads are also not a problem in your design. You can automatically generate wind loads as member loads or area loads (RFEM) on the following structural components:
With Dlubal, you can safely and easily design structures all over the world. Select from a large number of standards in the Base Data. You can also decide whether to create the combinations automatically.
The following standards are available:
EN 1990
EN 1990 | Timber
EN 1990 | Road Bridges
EN 1990 | Cranes
EN 1990 | Geotechnical Engineering
EN 1990 | Base + Timber
EN 15512
ASCE 7
ASCE 7 | Timber
ACI 318
IBC
CAN/CSA
NBC
NBC | Timber
NBR 8681
IS 800
SIA 260
SIA 260 | Timber
BS 5950
GB 50009
GB 50068
GB 50011
CTE DB-SE
SANS 10160-1
NTC
NTC | Timber
AS/NZS 1170.0
SP 20.13330:2016
TSC | Steel
For the European standards (EC), the following National Annexes are available:
In the "Load Cases & Combinations" dialog box, you have an option to automatically generate load and result combinations as soon as you have selected the corresponding combination expressions. For example, you can also copy or add load cases in a clearly arranged window.
Furthermore, you can manage the load cases and combinations in the tables.
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:
The cross-section resistance design analyzes tension and compression along the grain, bending, bending and tension/compression as well as the strength in shear due to shear force.
The design of structural components at risk of buckling or lateral buckling is performed according to the Equivalent Member Method and considers the systematic axial compression, bending with and without compression force as well as bending and tension. The deflection of inner spans and cantilevers is compared to the maximum allowable deflection.
Separate design cases allow for a flexible and stability analysis of members, sets of members, and loads.
Design-relevant parameters such as such as stability analysis, load duration in case of fire, member slendernesses, and limit deflection can be adjusted as desired.
After opening the add-on module, it is necessary to select the members/sets of members, load cases, load or result combinations for the ultimate and the serviceability limit state design. The materials from RFEM/RSTAB are preset and can be adjusted in RF-/TIMBER CSA. Material properties listed in the respective standard are included in the material library.
When checking the cross-sections, you can specify whether to consider a cross-section selected in RFEM/RSTAB, or a modified cross-section. Then, you can define the load duration classes, the moisture service conditions, and timber treatment.
The deformation analysis requires the reference lengths of the relevant members and sets of members. Furthermore, you can define a specific direction of deflection, precamber and the beam type.
For fire resistance design, you can define the charring sides of a member or set of members.
After the calculation, the module displays results in clearly arranged result tables. All intermediate values (for example, governing internal forces, adjustment factors, and so on) can be included in order to make the design more transparent. The results are sorted by load case, cross-section, set of members, and members. If the analysis fails, the affected cross-sections can be modified in an optimization process.
The design ratio is represented with different colors in the RFEM/RSTAB model. This way, you can quickly recognize critical or oversized areas of the cross-section. Furthermore, result diagrams displayed on the member or set of members ensure targeted evaluation.
In addition to the input and result data, including design details displayed in tables, you can add all graphics into the printout report. This way, comprehensible and clearly arranged documentation is guaranteed. You can select the report contents and extent specifically for the individual designs.
The calculated stresses and settlements are displayed in result windows. In addition, it is possible to evaluate the results graphically. The graphic displays the position and the layer arrangement of the soil samples to clarify the results.
The final result window shows the elastic foundation coefficients. Graphical evaluation is possible as well.
Elastic foundation coefficients are calculated according to the non-linear iterative method. The module determines elastic foundation coefficients for each individual element. They are dependent on the deformation.
The definition of soil layers is performed in a clearly arranged input window. An extensible library facilitates the selection of soil properties.
The elasticity can be defined either by the stiffness modulus or the modulus of elasticity and the Poisson's ratio. It is possible to define any number of soil layers. You can assign the layers to the building graphically or by entering the relevant coordinates.
Wind loads can be automatically generated as member loads or area loads on the following structural components (optional with internal pressure for open buildings):