RF-/STEEL Plasticity is an extension of the RF-/STEEL EC3 add-on module. In RF-/STEEL Plasticity, the following design methods are available:
~ Cross-sections consisting of two or three sheets (I-, C-, Z-, L-sections, channels, tees), flat steel, pipes, and hollow sections according to the Partial Internal Forces Method (PIF method) with redistribution by Kindmann/Frickel
~ Elliptical cross-sections with analytical nonlinear optimization procedure
~ Methods for general cross-sections:
~~ Partial Internal Forces Method without redistribution by Kindmann / Frickel
~~ Simplex Method
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The RF-PUNCH Pro add-on module performs the design of punching shear resistance for singularly or linearly supported surfaces. The module automatically determines the governing punching load from the specified load. Also, it is possible to apply a concentrated punching load to a slab manually.
With RF-PUNCH Pro, you can quickly and efficiently perform punching shear design according to the following standard EN 1992-1-1:2004 + AC:2010 (EC2 for RFEM required).
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.
Section C2.3(1) requires a stiffness reduction factor of 0.8 to be applied to all structural members’ axial and flexural stiffnesses that contribute to the stability of the structure. The code further suggest to apply this reduction factor to all members whether they contribute to stability or not to avoid artificial distortion. Additionally, the factor tau_beta should be applied to the flexural stiffness of structural steel members in the analysis. The factor tau_beta is a function of the required axial compressive strength (Pr) to the axial yield strength (Py) ratio.
RFEM can effectively and accurately take into account these considerations for member stiffness reduction. Under the “Edit Member” dialog box and the “Modify Stiffness” tab, the user has the option to select the Definition Type “According to AISC 360-10 C2.3(2).” Here, all previously mentioned variables relating to the axial and flexural stiffness reduction are listed.
The factor tau_beta can be set to “Iterative” for the program to automatically determine this value based on the equations C2-2a and C2-2b or can alternatively be “Set to 1.” The user must also define whether the alpha factor used in these equations should be based on an LRFD or ASD analysis.
Lastly, the flexural and axial stiffness multiplier factors are listed and set to 0.8 as defined by the Section C2.3(1).
Sometimes, a model in the graphic window is displayed without filling the entire window or with too large margins after clicking the [Show Whole Model] button. In order to set the size of the graphic margins, click “Options” -> “Display Margins and Stretch Factors”. The value specifies the percentage of the margin relative to the graphic window size.
RFEM and RSTAB provides a wide range of selection options. Some of the previous posts have already described selection using “Special Selection” or tables.
Project Navigator can also be used as an immediately available tool for the selection of structural data and loads. In this case, the procedure is similar to selection in tables using the synchronized selection.
By clicking “Options” -> “Display Properties” -> “Edit”, you can change and save display settings for printout reports and your screen. For example, you can set individual colors for cross-sections.
For this, open the respective dialog box by double-clicking the color next to the section number and select a new color. In addition, it is possible to use the display properties for the screen also for the printout report by checking the option “Identical Settings for screen and printout report”.