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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.
For some structures, it is necessary to design them in different configurations. Thus, it may be the case that a lifting platform must be analyzed in the position on the ground, in the middle and extended. Since such tasks require the creation of several models, but they are almost identical, updating all models with just one mouse click makes the work considerably easier.
This article describes the basic principles and modeling approaches of pulley systems in RFEM.
Settlements in the structure can also affect surrounding structures. The adjacent settlement of separated slabs can be considered with RF-SOILIN using a small tool.
This example describes a definition of a planar surface by four nodes that have been imported and seem to lie in a common plane, but in reality, they are not exactly in one plane due to, for example, a previous modeling error of a few millimeters. When trying to create a planar surface, the error message "Error in the surface definition! The nodes do not lie in a common plane." appears.
If a rib is part of a nonlinear design or is rigidly connected to following walls, a surface should be used for the modeling instead of a member. So that the rib can still be designed as a member, a result member with the correct eccentricity is required, which transforms the surface internal forces into member internal forces.
Both the determination of natural vibrations and the response spectrum analysis are always performed on a linear system. If nonlinearities exist in the system, they are linearized and thus not taken into account. Straight tension members are very often used in practice. This article will show how you can display them approximately correctly in a dynamic analysis.
Pay particular attention to connection points of members and surfaces when you deal with mixed systems because not all internal forces can always be transferred without difficulty at the coupling location.
The beam is resting on the column and the beam ends at the outer edge of the column. These requirements can be easily fulfilled in an architectural model with solids. In member analysis, simplified line models are used in which center lines meet in a common node. In this article, the influence of member eccentricities on the determination of internal forces is shown on three simple models.
When you perform the subsequent modeling of a beam under an existing floor, the first question arises which forces should be transferred between the downstand beam and the floor and whether a composite effect is the goal. In this case, the floor should rest on the downstand beam without any composite.
In RFEM and RSTAB, you can use many interfaces to simplify the modeling of your structure. From background layers to the import of IFC objects that can be converted into members or surfaces, up to the import of the entire structural system from Revit or Tekla. Regardless of the performance of the selected interface, the further utilization also depends on the accuracy of the imported data.
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