Did you know? In the Design Supports, you can now define fully threaded screws as transversal compression stiffening elements for the "Compression Perpendicular to Grain" design. In this case, the pressing-in and buckling of the bolts is analyzed.
Moreover, the design shear resistance is checked in the plane of the screw tip. The angle of dispersal can be considered as linear under 45° or nonlinear (according to Bejtka, I. (2005). Verstärkung von Bauteilen aus holz mit vollgewindeschrauben. KIT Scientific Publishing.).
Graphical and numerical results of stresses and stress ratios fully integrated in RFEM
Flexible design with different layer compositions
High efficiency due to few entries required
Flexibility due to detailed setting options for basis and extent of calculations
A local overall stiffness matrix of the surface in RFEM is generated on the basis of the selected material model and the layers contained. The following material models are available:
Orthotropic
Isotropic
User-defined
Hybrid (for combinations of material models)
Option to save frequently used layer structures in a database
Determination of basic, shear, and equivalent stresses
In addition to the basic stresses, the required stresses according to DIN EN 1995-1-1 and the interaction of those stresses are available as results.
Stress analysis for structural surfaces including simple or complex shapes
Equivalent stresses calculated according to different approaches:
Shape modification hypothesis (von Mises)
Shear stress hypothesis (Tresca)
Normal stress hypothesis (Rankine)
Principal strain hypothesis (Bach)
Calculation of transversal shear stresses according to Mindlin or Kirchhoff, or user-defined specifications
Serviceability limit state design by checking surface displacements
User-defined specifications of limit deflections
Possibility to consider layer coupling
Detailed results of individual stress components and ratios in tables and graphics
Results of stresses for each layer in the model
Parts list of designed surfaces
Possible coupling of layers entirely without shear
Optional consideration of stiffening elements for transversal tension
Two design types available for stiffening elements concerning transversal tension:
Constructive if required
Full absorption of tension stresses perpendicular to grain
Calculation of required number of stiffening elements for transversal tension and graphical representation of the arrangement in the beam
Simple geometry input with illustrative graphics
Convenient generation of snow loads according to EN 1991-1-3 or DIN 1055:2005, Part 5
Automatic determination of wind loads according to EN 1991-1-4 or DIN 1055:2005, Part 4
User-defined load cases and load applications
Automatic generation of all possible load combinations
Connection to MS Excel and access via COM interface
Material library for both standards
For design according to EC 5 (EN 1995), the following National Annexes are available:
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)
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)
Extensive library of permanent loads
Allocation of a structure to service class, 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.
After the calculation, the RF‑/JOINTS Timber - Steel to Timber add‑on module lists joint stiffnesses of all individual members, among other things. The following design results are displayed:
Check of minimum spacing
Load-carrying capacity of single fastener
Steel plates (bearing resistance and stress according to EC 3 and AISC)
Stress analysis with reduced timber cross‑section
Block shear failure
Total load carrying-capacity (including stiffness determination, transversal tension design according to EC 5, and others)