Further Information

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• How does RFEM efficiently determine the shape of a curved plate structure (compression shell) subjected to compression only?

The efficiency of a plate structure subjected to compression depends on the shape of it. For each load distribution, there is an associated optimum shape that transfers the loads to the foundations by using as little material as possible.

Since the utilization of a structure usually specifies several load states, it is recommended to align the optimum shape with the main load (permanent load) of the model for purely strategic reasons.

The RFEM program helps you to find these model shapes in conjunction with the RF‑FORM‑FINDING add-on module. The underlying form-finding process shifts the position of the FE mesh nodes in space based on a specified load so that the new position of the elements transfers the load mainly by using the membrane load-bearing capacity. The explicit use of the axial force resistance of members and the membrane force resistance of the surface elements results in constant stress conditions in the cross-sections. This condition with no bending stress utilizes the cross-sections optimally and allows for a very effective structure with the minimum material usage.

This process can be applied to both the usual cable and membrane structures consisting of flexible elements under tension as well as for pressure-loaded rigid beam and shell structures.

To develop an optimum shape of the compression shell in RFEM, proceed as follows:

1. Activating the RF-FORM-FINDING add-on module in "General Data", tab "Options"

2. Specifying form-finding settings for the structural elements

4. Form-finding analysis
The finally developed shape can then be used in RFEM for the structural analysis with regard to the further variable loads.

• When calculating an RFEM file, Task Manager shows a usage of about 50% only. Why does the calculation not use all kernels?

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The calculation does use all kernels. Some processors (Intel Core i7, i9, XEON...), however, support Hyper-Threading Technology. This means that each physically available procesor core is split up into two virtual cores for applications. This aims at a better usage of the single units of the core. There are some applications which benefit from this and run faster. However, this is not the case for the computation kernel of RFEM. Therefore, the computation kernel of RFEM often only uses the physically available cores, and Task Manager displays that the processor seems to only have a usage of 50%.

If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

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.

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