We provide hints and tips to help you get started with the basic program RFEM.
KB 001672 | Using Member Types and Hinges on Truss Example
Video
First Steps with RFEM
Description
When modeling frame structures, RFEM and RSTAB provide various options for controlling the transfer of internal forces and moments at the connection points of members. On the one hand, you can use the member types to define whether only forces or also moments act on the connected members. On the other hand, you can exclude certain internal forces from the transfer by using hinges. A special type are scissor hinges, which allow for a realistic modeling of roof structures, for example.
Keywords
Dlubal Knowledge Base Truss Member type Hinge Scissor hinge Truss member Buckling member Null member Nonlinearity Rafters Posts Beam crossing Dlubal KB Knowledge Base Technical Contribution
Links
- Useful Tools for Fast Generation of Structures in RFEM
- Useful Tools for Fast Generation of Structures in RSTAB
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Using Member Types and Hinges on Truss Example
When modeling frame structures, RFEM and RSTAB provide various options for controlling the transfer of internal forces and moments at the connection points of members.
SHAPE-THIN | Cold-Formed Sections
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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I want to calculate a steel roof structure. There are rafter components and purlins consisting of steel, crossing each other with offset (by cross-section depth) at the connection point.
Is there any option for the rafter (without using an intermediate member) to transfer only vertical and shear forces and no moments? The purlin should get no torsion and both members should cross the connection point in a flexurally rigid way. - What is the easiest way to enter a scissor hinge in RSTAB or RFEM?
- In a nodal point, several members are hinged. How many member end hinges have to be defined?
- I would expect the results from my load combination (CO) set to a linear analysis to equal the summation of the results from my load cases (LC) also set to a linear analysis. Why do the results not match?
- A rigid member should only be able to absorb tensile forces or only compressive forces. What are the options for considering these nonlinearities in the calculation?
- How do I display the nodal displacements graphically?
- How does the activation of the precamber imperfection work?
- Are the models and presentations from Info Day 2020 freely available, and can you send them to me?
- Why do I obtain great differences in results for both the deformation and the bending moments when applying inclination by using imperfection to a single member and an articulated set of members with the same total length?
- Are the models and presentations from Info Day 2017 freely available, and can you send them to me?
