Question
When calculating a case of RF‑/JOINTS Steel - Column Base, I get Message No. 48335 saying that the bending moment Mz exceeds 5% of the plastic moment resistance. What does it mean?
Answer:
The analysis of a rigid column base is performed according to EN 1993‑1‑8 in the RF‑/JOINTS Steel - Column Base add-on module. The standard only provides simple bending in the design format. The design can be performed for pure compression, tension, simple bending, or a combination of bending and tension, or bending and compression. If you click "Yes" to confirm the message, the add-on module performs all designs without taking into account the unsupported internal force Mz.
Do you have any questions?
![Display Options for 3D Graphics](/en/webimage/010212/3015603/01-en.png?mw=512&hash=65e98cfe859ce35a3e3e9da47a0ef9335401520e)
In addition to the result tables, you can create three-dimensional graphics in RF‑/FRAME‑JOINT Pro and RF‑/JOINTS. This is a realistic representation of a connection to scale.
![Frame with Foundation with Anchor Bolts](/en/webimage/014960/2982134/RFEM_-_Model_File.png?mw=512&hash=a613143c8ab9ea966fc9ae6ebd4b37efbf4cd317)
Table 3.1 of EN 1993‑1‑8:2010‑12 defines the nominal values of the yield strength and the ultimate limit strength of bolts. The bolt classes given here are 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 10.9. The note for this table states that the National Annex may exclude certain bolt classes. For the NA of Germany, these are the bolt classes 4.8, 5.8, and 6.8.
![Frame with Foundation Considering Horizontal Friction](/en/webimage/014941/2952533/RFEM_-_Model_File.png?mw=512&hash=a613143c8ab9ea966fc9ae6ebd4b37efbf4cd317)
According to Clause 6.2.2 (6) of EN 1993‑1‑8:2010‑12, you can apply friction using the friction coefficient to design the shear capacity.
![System and Loading According to [1]](/en/webimage/009455/2418877/01-en-png.png?mw=512&hash=e5b08a40fd9a5a16825be6182b3138f78627561e)
The product range of Dlubal Software contains various modules for the design of steel and timber connections. The RF-/JOINTS Steel – Column Base add-on module allows you to analyze footings of hinged or restrained steel column bases. The fastener selection, foundation geometry, and material quality are crucial for the cost-effective and safe design of the column base.
![Feature 002820 | Limit Plastic Strain for Welds](/en/webimage/050344/3881226/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
In the ultimate configuration of the steel joint design, you have the option to modify the limit plastic strain for welds.
![Component "Base Plate"](/en/webimage/050345/3881657/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
The "Base Plate" component allows you to design base plate connections with cast-in anchors. In this case, plates, welds, anchorages, and steel-concrete interaction are analyzed.
![Feature 002807 | 3D Display of FSM Results](/en/webimage/049281/3861162/2024-05-01_10-32-55.png?mw=512&hash=2377d291bc20ac3d78d617b50c131614e99ac6f7)
In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.
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- Design of five types of seismic force-resisting systems (SFRS) includes Special Moment Frame (SMF), Intermediate Moment Frame (IMF), Ordinary Moment Frame (OMF), Ordinary Concentrically Braced Frame (OCBF), and Special Concentrically Braced Frame (SCBF)
- Ductility check of the width-to thickness ratios for webs and flanges
- Calculation of the required strength and stiffness for stability bracing of beams
- Calculation of the maximum spacing for stability bracing of beams
- Calculation of the required strength at hinge locations for stability bracing of beams
- Calculation of the column required strength with the option to neglect all bending moments, shear, and torsion for overstrength limit state
- Design check of column and brace slenderness ratios
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