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Dipl.-Ing. (FH) Robert Vogl
2016-01-13

Stresses for Weld Seam Design

In RF-STEEL Surfaces, it is possible to display the stresses relevant for the design of welds, for example, according to EN 1993‑1‑8, Figure 4.5. When evaluating the stress components, the local xyz-axis system of the surfaces must be considered.

The example shows the weld connection of a frame joint. The surface y-axis of a truss flange is parallel to the weld axis. For the superposition of stresses according to EN 1993‑1‑8, Eq. (4.1) the following stresses are considered:

  • σ⊥ (normal stress perpendicular to weld axis): σx,m
  • σ‖ (normal stress parallel to weld axis, insignificant): σy,m
  • τ⊥ (shear stress perpendicular to weld axis): τxz
  • τ‖ (shear stress parallel to weld axis): σxy,m

The stress components can be set in the Results Navigator and displayed in the FE mesh points.

Author

Mr. Vogl creates and maintains the technical documentation.

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[EN] FAQ 004924 | In RF‑/STEEL EC3, is the "Elastic design (also for Class 1 and Class 2 cross-sections)" ...
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Knowledge Base Articles
Running Steel Joint Design
The advantage of the RFEM 6 Steel Joints add-on is that you can analyze steel connections using an FE model for which the modeling runs fully automatically in the background. The input of the steel joint components that control the modeling can be done by defining the components manually, or by using the available templates in the library. The latter method is included in a previous Knowledge Base article titled “Defining Steel Joint Components Using the Library". The definition of parameters for the design of steel joints is the topic of the Knowledge Base article “Designing Steel Joints in RFEM 6".
Activating Weld Design in RF-/STEEL EC3
The RF‑/STEEL EC3 add-on module can perform the design of fillet welds for all parametric, welded cross-sections of the cross-section library. For this, the option must be activated in the detail settings of the module. As an alternative, you can also use a surface model for the design.
Cross-Section Optimization
When optimizing cross-sections in the add-on modules, you can also select arbitrarily defined cross-section favorites lists - in addition to the cross-sections from the same cross-section series as the original cross-section.
Model
Designing rigid end plate connections is difficult for four-row connection geometries and multi-axis bending stresses, because there are no official design methods.
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Stresses for Weld Seam Design
Stresses for Weld Seam Design
Deformation of Steel Joint | Structural Analysis
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Design of Steel Joint of Column and Beam
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Flanged Elbow Pipe Connection
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Model of Multi-Material Staircase (Wood, Steel, Glass) Antibes, France (© YLEx)
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Curved Glued-Laminated Timber Stringer Making up Multi-Material Staircase (Wood, Steel, Glass) Antibes, France (© YLEx)
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Overview of Multi-Material Staircase (Wood, Steel, Glass) Antibes, France (© YLEx)
Upper Part of Multi-Material Staircase (Wood, Steel, Glass) Antibes, France (© YLEx)
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SHAPE-THIN Cross-Section Properties Software | Section Properties of Thin-Walled Cross-Sections, Elastic and Plastic Design
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SHAPE-THIN Cross-Section Properties Program  | Results - Distribution of Plastic Normal Stresses

All results can be evaluated and visualized in an appealing numerical and graphical form. Selection functions facilitate the targeted evaluation.

The printout report corresponds to the high standards of RFEM and rstab/rstab-9/what-is-rstab RSTAB. Modifications are updated automatically.

SHAPE-THIN Cross-Section Properties Program | Calculation Parameters: c/t-Parts and Effective Cross-Section

SHAPE-THIN calculates all relevant cross‑section properties, including plastic limit internal forces. Overlapping areas are set close to reality. If cross-sections consist of different materials, SHAPE‑THIN determines the effective cross‑section properties with respect to the reference material.

In addition to the elastic stress analysis, you can perform the plastic design including interaction of internal forces for any cross‑section shape. The plastic interaction design is carried out according to the Simplex Method. You can select the yield hypothesis according to Tresca or von Mises.

SHAPE-THIN performs a cross-section classification according to EN 1993-1-1 and EN 1999-1-1. For steel cross-sections of cross-section class 4, the program determines effective widths for unstiffened or stiffened buckling panels according to EN 1993-1-1 and EN 1993-1-5. For aluminum cross-sections of cross-section class 4, the program calculates effective thicknesses according to EN 1999-1-1.

Optionally, SHAPE‑THIN checks the limit c/t-values in compliance with the design methods el‑el, el‑pl, or pl‑pl according to DIN 18800. The c/t-zones of elements connected in the same direction are recognized automatically.

SHAPE-THIN Cross-Section Properties Program | Global Calculation Parameters

SHAPE-THIN includes an extensive library of rolled and parameterized cross-sections. They can be composed or supplemented by new elements. It is possible to model a section consisting of different materials.

Graphical tools and functions allow for modeling complex section shapes in the usual way common for CAD programs. The graphical entry provides the option of setting point elements, fillet welds, arcs, parameterized rectangular and circular sections, ellipses, elliptical arcs, parabolas, hyperbolas, spline, and NURBS. Alternatively, it is possible to import a DXF file that is used as the basis for further modeling. You can also use guidelines for modeling.

Furthermore, parameterized input allows you to enter model and load data in a specific way so they depend on certain variables.

Elements can be divided or attached to other objects graphically. SHAPE-THIN automatically divides the elements and provides for an uninterrupted shear flow by introducing dummy elements. In the case of dummy elements, you can define a specific thickness to control the shear transfer.

Frequently Asked Questions (FAQ)
Can I calculate the effective section properties of a cross-section using RSECTION?
Can I analyze and design hydraulic steel structures with the Dlubal programs?
Which programs and add-ons are suitable for the structural analysis and design of steel structures?
In the case of stairs with a complicated geometry, it is often difficult to design welds by using the analytical methods. How can I do this with RFEM?
The design ratio of the cross-section check is different for the RF‑/STEEL and RF‑/STEEL EC3 add-on modules. What is the reason?
What is the difference between SHAPE‑THIN 9 and SHAPE‑THIN 8?
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Amphitheater of Municipal Theater in Most, Czech Republic
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