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Why Dlubal Software?
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.
The ASCE 7-16 standard requires both balanced and unbalanced snow load case scenarios for a structure's design consideration. While this may be more intuitive for flat or even gable/hip type roofs, the determination of snow loads is increasingly more difficult for arch roofs due to complex geometry. However, with guidance from the ASCE 7-16 on snow load calculations for curved roofs and RFEM's efficient load application tools, it's possible to consider both balanced and unbalanced snow loads for a reliable and safe structure design.
As gravity loads act on a structure, lateral displacement occurs. In turn, a secondary overturning moment is generated as the gravity load continues to act on the elements in the laterally displaced position. This effect is also known as "P-Delta (Δ)." Sect. 22.214.171.124 of the ASCE 7-16 Standard and the NBC 2015 Commentary specify when P-Delta effects should be considered during a modal response spectrum analysis.
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.
When it comes to wind loads on building type structures per the ASCE 7, numerous resources can be found to supplement design standards and aid engineers with this lateral load application. However, engineers may find it more difficult to find similar resources for wind loading on non-building type structures. This article will examine the steps to calculate and apply wind loads per the ASCE 7-16 on a circular reinforced concrete tank with a dome roof.
The moving load library of RF-MOVE Surfaces also contains design loads specified in the AASHTO bridge standard, such as B. Design Truck (HS-20), Design Tandem , Type 3 and Overload .
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).
If a member with an aluminum cross-section consisting of slender elements is used, there is the possibility of failure due to local buckling of the flanges or webs before the member reaches its full strength. There are three options available in the RF-/ALUMINUM ADM add-on module to determine the nominal flexural strength for the limit state local buckling Mnlb from Section F.3 of the 2015 Aluminum Design Manual. These three methods include the sections F.3.1 'Weighted Average Method', F.3.2 'Direct Strength Method' and F.3.3 'Limit Elements' Method.
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.
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