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- One software package for all application areas
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
In addition to determine loads, there are some particularities concerning the load combinatorics in timber design which have to be considered. Contrary to steel structures where the largest loading results from all unfavorable actions, in timber construction, the strength values are dependent on the load duration and the 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.
The design of a torsional loaded beam according to AISC Design Guide 9 will be shown based on a verification example. The design will be performed with the RF-STEEL AISC add-on module and the RF-STEEL Warping Torsion module extension with 7 degrees of freedom.
The American Steel Joist Institute (SJI) recently developed Virtual Joists tables to evaluate the cross-section properties of cantilevers used for open steel steels ( Open Web Steel Joists ). These virtual-joist cross-sections describe comparable wide-flange beams that closely approximate the area of the chord flange, the effective moment of inertia, and the weight.
In RF- / STEEL AISC, the mode shapes of sets of members can be displayed graphically in a separate window after the calculation. To do this, select the relevant set of members in the results window and click the [Mode Shapes] button (see Figure).
Requirements for the design of structural stability are given in the AISC 360 – 14th Ed. Chapter C. In particular, the direct analysis method provisions, which was previously located in Appendix 7 of the AISC 360 – 13th Ed., are described in detail. This method is considered an alternative to the effective length method which in turn eliminates the need for effective length (K) factors other than 1.0.
In the AISC 360 – 14th Ed. C2.2, the direct analysis method requires the consideration of initial imperfections to be taken into consideration. The important imperfection of recognition is column out-of-plumbness. According to C2.2a, the direct modeling of imperfections is one method to account for the effect of initial imperfections. However, in many situations, the expected displacements may not be known or easily predicted.
As of RFEM version 5.06, the member stiffnesses can be influenced by methods that are aligned with the US steel construction standard ANSI/AISC 360-10. According to this standard, a reduction factor τb must be considered for the determination of internal forces in all members whose flexural resistance contributes to the model's stability. This coefficient depends on the axial force in the member: The larger the axial force, the larger is τb.
We often receive customer questions regarding the display of positive or negative eccentricity of positive transverse loads in RF‑/STEEL EC3 and RF-/STEEL AISC.
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