The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
RSTAB 9 is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
Do you often spend too long calculating cross-sections? Dlubal Software and the RSECTION stand-alone program facilitate your work by determining section properties of various cross-sections and performing a subsequent stress analysis.
Do you always know where the wind is blowing from? From the direction of innovation, of course! With RWIND 2, you have a program at your side that uses a digital wind tunnel for the numerical simulation of wind flows. The program simulates these flows around any building geometry and determines the wind loads on the surfaces.
Are you looking for an overview of snow load zones, wind zones, and seismic zones? Then you are in the right place. Use the Geo-Zone Tool to determine quickly and efficiently snow loads, wind speeds, and seismic data according to ASCE 7‑16 and other international standards.
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In principle, the same formulas are used for the calculation of Mcr. Nevertheless, there is a big difference:
DIN 8800‑2 simplifies the coefficient of load application point C2 and sets it to 0.5. Eurocode 3 describes this coefficient more precisely. Depending on the load action, C2 can be between 0.41 and 1.562.
If the load application point is placed in the center of gravity (provided that the cross-section is double-symmetric), the Mcr values are the same according to DIN 18800 and EC 3.
The displayed support forces are the characteristic values, including the reduced dynamic factors, and can thus be used directly for a further calculation.
There are three ways to sort the display in result window 2.3.
NCI to DIN EN 1993‑6, Cl. 2.3.1 allows for reductions of dynamic factors (vibration coefficients) for values ≥ 1.1. Therefore, you can use these reduced support loads for the design of support and hanger structures.
In CRANEWAY, if you select National Annex "DIN" and dynamic coefficients ≧ 1.1, the reduction is considered automatically.
If you select the design situation "Accidental - Snow - North German Plain", the coefficient for the accidental snow loads (Cesl = 2.30) is automatically taken into account when generating the load combinations. This design situation is usually generated in addition to the general design situations (ULS, SLS).
You can easily check whether a building is located in the North German Plain by entering the location data into the Geo-zone tool Snow, Wind, and Seismic Zone Maps on our homepage (see Image 03).
Activate the "c/ t parts and effective cross-section properties" option in the General Data of the cross-section. Then, click the "Calculation Parameters" button to open the dialog box with the same name. In the second tab, you can specify the desired standard (Image 01).
Then, you have to enter the elements of the cross-section. The c/t parts are usually generated automatically from the geometric conditions; however, they can be created as user-defined in Table 1.7 Cross-Section Parts for Classification or the corresponding dialog box.
Then, define a load case in Table 2.1 Load Cases (Image 03) or in the "Edit Load Cases and Combinations" dialog box, and the internal forces in Table 3.1 or in the "Edit x-Location" dialog box (Image 04).
After the calculation, the results of the effective cross-section are available when clicking the "Effective Parts" button (Image 04).
The filter functions in the "Details" dialog box, "Stability" tab, should allow you to neglect small moments or compression forces, and thus, for example, perform a buckling analysis for asymmetric cross-sections without taking into account the "bending and compression" interaction. Otherwise, a warning would appear saying that no stability analysis is possible.
The limits are applied and set at the user's discretion and usually agreed with a tester. Dlubal Software cannot provide a general recommendation. However, it can be reasonable for very slender components to reduce the limit value to 0%.
Not at all. If the value of alpha*crit (the critical buckling value without torsional stiffness) is displayed in red and thus amounts to "0", there is no reduction of the imperfection factor (European lateral-torsional buckling line). The basic value for the imperfection factor is used.
According to EN 1993‑1‑1, it is only possible to increase the material factor based on the applied stresses if stability analyses are not performed with the equivalent member design. Since the equivalent member design checks are activated in the next tab, "Stability", by default, this check box is grayed out.
After deactivating the equivalent member design, this checkbox is enabled and activated by default.
For general cross-sections, including the SHAPE‑THIN cross-sections, you can only perform the elastic design in RF‑/STEEL EC3: The plastic interactions are only applicable to a few cross-section shapes.
Torsion on Cross-Section Class 4 is not regulated in Eurocode 3, which is why this warning appears.
You can change the cross-section, classify the cross-section in Window 1.3 manually to Cross-Section Class 3, or neglect the torsion in the "Details" dialog box, "Ultimate Limit State" tab, at your discretion and on your own responsibility.