The structural analysis programs RFEM and RSTAB are perfectly suited for structural analysis and design of two and three-dimensional timber structures, such as beams, continuous beams, frames, truss girders, glued-laminated beams, timber sandwich panels, wooden houses, bridges, and towers.
Structural Analysis and Design of Timber Structures | Dlubal Software
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![Format Conversion Factor, KF, when Designing per 2018 NDS and LRFD in RF-LAMINATE](/en/webimage/009053/2706259/01-en_(3).png?mw=512&hash=5843a5e784f9da1372a3cd61bbdd8db638debab7)
The American Wood Council (AWC) has released the 2018 Edition of the National Design Specification (NDS) for Wood Construction. This is the second edition of the NDS to contain a chapter dedicated to cross-laminated timber (CLT) design. Therefore, a couple of revisions were included in the 2018 NDS when compared to the previous 2015 Edition.
![Local Effects with Regard to Load Introduction](/en/webimage/009651/2419861/01-en-png-5-png.png?mw=512&hash=57fe69a0196bfb7d797aa679c1b239891bfc6570)
As an alternative to the equivalent member method, this article describes the possibility to determine the internal forces of a wall at risk of buckling according to the second-order analysis, taking imperfections into account, and to subsequently perform the cross-section design for bending and compression.
![Layer Structure with Stiffness and Strength Properties for Stora Enso CLT 100 C5s](/en/webimage/009660/2419879/01-en-png-4-png.png?mw=512&hash=dd9ab75a2cf05d5db1e02f21528d502129c35a4b)
The following article describes a design using the equivalent member method according to [1] Section 6.3.2, performed on an example of a cross-laminated timber wall susceptible to buckling described in Part 1 of this article series. The buckling analysis will be performed as a compressive stress analysis with reduced compressive strength. For this, the instability factor kc is determined, which depends primarily on the component slenderness and the support type.
![Cross-Laminated Timber Wall with Openings Subjected to Wall Stress](/en/webimage/009665/467451/01-de-png.png?mw=512&hash=2551750327252c0e49d549ec0d9fb2579bfaa885)
Basically, you can design the structural components made of cross-laminated timber in the RF-LAMINATE add-on module. Since the design is a pure elastic stress analysis, it is necessary to additionally consider the stability issues (flexural buckling and lateral-torsional buckling).
![Torsional stress at the intersection points of a cross -laminated timber plate in RFEM](/en/webimage/006828/497052/RF-LAMINATE.png?mw=512&hash=f7633cd46a79186ac55ba5a5f450c2a96ad24a85)
In the RF-LAMINATE add-on module for RFEM, the design of torsional shear stresses in the superposition of net and gross cross-section values is possible. The design is performed separately in the x- and y-directions. The loads on the intersection points of cross-laminated timber panels are checked.
![RF-/JOINTS Timber - Timber to Timber Add-on Module for RFEM/RSTAB | Design of Direct Timber Connections According to Eurocode 5](/en/webimage/002890/2982582/Truss_(1).png?mw=512&hash=8c5302ae04d7a2024cab77b7f047eafc1f238334)
- Design of hinged connections
- Biaxial inclination of the connected member (for example, a jack rafter joint)
- Connection of any number of members on one node for the type "Main member only"
- Screw diameter 6 mm – 12 mm
- Automatic check of the minimum distance between screws
- Optional free definition of screw distances
- Transfer of eccentricity from RFEM/RSTAB
- Crosswise or parallel screw alignment
- Definition of up to 16 screws in a row
- Graphical visualization of joints in the add-on module and in RFEM/RSTAB
- Performing all required designs
![RX-TIMBER Roof Stand-Alone Program | Design of Timber Roofs](/en/webimage/002949/3082468/11.jpg?mw=512&hash=3cf59b02a2883df92f903cd05cfcef162d84e31c)
- Design of the following roof types:
- Flat Roof
- Monopitch roof
- Duopitch roof (symmetrical/asymmetrical)
- Definition of any additional support and free selection of degrees of freedom (additional free definition of translational and rotational spring stiffness of supports and hinges)
- Arrangement of up to five collar/tie beams, including intermediate support for duopitch roof
- Automatic generation of wind and snow loads
- Automatic generation of required combinations for the ultimate and serviceability limit states, as well as fire resistance design (additional definition of several member and nodal loads)
- For design according to EC 5 (EN 1995), the following National Annexes are available:
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Germany DIN EN 1995-1-1/NA:2013-08 (Germany)
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NBN EN 1995-1-1/ANB:2012-07 (Belgium)
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BDS EN 1995-1-1/NA:2012-02 (Bulgaria)
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DK EN 1995-1-1/NA:2011-12 (Denmark)
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SFS EN 1995-1-1/NA:2007-11 (Finland)
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NF EN 1995-1-1/NA:2010-05 (France)
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I S. EN 1995-1-1/NA:2010-03 (Ireland)
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UNI EN 1995-1-1/NA:2010-09 (Italy)
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NEN EN 1995-1-1/NB:2007-11 (Netherlands)
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ÖNORM B 1995-1-1:2015-06 (Austria)
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PN EN 1995-1-1/NA:2010-09 (Poland)
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SS EN 1995-1-1 (Sweden)
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STN EN 1995-1-1/NA:2008-12 (Slovakia)
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SIST EN 1995-1-1/A101:2006-03 (Slovenia)
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CSN EN 1995-1-1:2007-09 (Czech Republic)
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BS EN 1995-1-1/NA:2009-10 (the United Kingdom)
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CYS EN 1995-1-1/NA:2011-02 (Cyprus)
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- Simple geometry input with illustrative graphics
- Input of tapered cantilevers with cut-to-grain on the bottom side of rafters
- Extensive material library that can be extended by user-defined materials
- Determination of design ratios, support forces, and deformations
- Color reference scales in result tables
- Direct data export to MS Excel
- Program languages: English, German, Czech, Italian, Spanish, French, Portuguese, Polish, Chinese, Dutch, and Russian
- Verifiable printout report, including all required designs. Printout report available in many output languages; for example, English, German, French, Italian, Spanish, Russian, Czech, Polish, Portuguese, Chinese, and Dutch.
![RX-TIMBER Frame Stand-Alone Program | Three-Hinged Frames with Finger Joint Connections](/en/webimage/002947/3082242/11.jpg?mw=512&hash=3cf59b02a2883df92f903cd05cfcef162d84e31c)
- Design of the following geometrical types:
- Symmetrical / asymmetrical
- Half-frame
- Column sloping inside / outside
- Intermediate piece with / without
- Direction of lamellas can be defined as parallel to inner or outer edge
- For design according to EC 5 (EN 1995), the following National Annexes are available:
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DIN EN 1995-1-1/NA:2013-08 (Germany)
-
NBN EN 1995-1-1/ANB:2012-07 (Belgium)
-
DK EN 1995-1-1/NA:2011-12 (Denmark)
-
SFS EN 1995-1-1/NA:2007-11 (Finland)
-
NF EN 1995-1-1/NA:2010-05 (France)
-
UNI EN 1995-1-1/NA:2010-09 (Italy)
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NEN EN 1995-1-1/NB:2007-11 (Netherlands)
-
ÖNORM B 1995-1-1:2015-06 (Austria)
-
PN EN 1995-1-1/NA:2010-09 (Poland)
-
SS EN 1995-1-1 (Sweden)
-
STN EN 1995-1-1/NA:2008-12 (Slovakia)
-
SIST EN 1995-1-1/A101:2006-03 (Slovenia)
-
CSN EN 1995-1-1:2007-09 (Czech Republic)
-
BS EN 1995-1-1/NA:2009-10 (the United Kingdom)
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- Simple geometry input with illustrative graphics
- Automatic generation of wind and snow loads
- Automatic creation of required combinations for the ultimate and serviceability limit states, as well as fire resistance design
- Possibility to define load cases and load applications
- Extensive material library for both standards
- Optional extension of material library by further materials
- Extensive library of permanent loads
- Allocation of framework to service classes and specification of service class categories
- Determination of design ratios, support forces, and deformations
- Info icon indicating successful or failed design
- Color reference scales in result tables
- Direct data export to MS Excel
- DXF interface for preparation production documents in CAD
- Program languages: English, German, Czech, Italian, Spanish, French, Portuguese, Polish, Chinese, Dutch, and Russian
- Verifiable printout report, including all required designs. Printout report available in many output languages; for example, English, German, French, Italian, Spanish, Russian, Czech, Polish, Portuguese, Chinese, and Dutch.