Answer:
The difference compared to the expected results is due to the calculation of the self-weight of the structure. However, the self-weight acts upwards, so it is subtracted from the resulting reactions instead of being added.
Question
I have created a very simple model to check the manual calculation. I cannot get the expected results. Could you please help me?
Author
Ing. Martinec takes care of customer service and student licenses in the Czech office.
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Knowledge Base
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Knowledge Base
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Besides the standardized gamma method, you can display the semi-rigid composite beams also as a framework model.
In timber design, beams are often built from several timber elements. The individual elements can be connected with glue, nails, bolts, or dowels. A glued connection is to be assumed as rigid. In the case of dowel‑type fasteners, the joint is compliant (slip joint), and the cross‑section properties of the connected elements cannot be fully applied.
The same structures are often needed in several projects, such as the purlin with columns and braces in this example. The dimensions can be changed directly in RFEM or RSTAB by shifting the nodes.
In current literature, the formulas used to determine internal forces and deformations manually are usually specified without considering the shear deformation. The deformations resulting from shear force are often underestimated in timber construction in particular.
Using the "Beam Panel" thickness type, you can model timber panel elements in 3D space. You just specify the surface geometry and the timber panel elements are generated using an internal member-surface construct, including the simulation of the connection flexibility.
You have the option to perform the fire resistance design of surfaces using the reduced cross-section method. The reduction is applied over the surface thickness. It is possible to perform the design checks for all timber materials allowed for the design.
For cross-laminated timber, depending on the type of adhesive, you can select whether it is possible for individual carbonized layer parts to fall off, and whether you can expect increased charring in certain layer areas.
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Among others, the following cross-laminated timber manufacturers are available in the layer structure library:
- Binderholz (USA)
- KLH (USA, CAN)
- Kalesnikoff (USA, CAN)
- Nordic Structures (USA, CAN)
- Mercer Mass Timber
- SmartLam
- Sterling Structural
- Superstructures listed in Lignatec Edition 32 "Cross-Laminated Timber of Swiss Production"
By importing a structure from the layer structure library, all relevant parameters are adopted automatically. The library is continually updated.
The Timber Design add-on for RFEM 6 / RSTAB 9 is multi-purpose and combines a large number of additional elements. [*S16332764*] Timber Design Add-on for RFEM 6
For some time, I have had display problems in RFEM and RSTAB that make it difficult to work with the software. It mainly affects the result display. The lines are extended, dotted, or not displayed at all, depending on whether I zoom in or out.
Do you have any idea how to solve this problem?
Do you have any idea how to solve this problem?
I would like to carry out the flexural buckling design for timber components with imperfections and internal forces according to the second-order analysis. Is it sufficient to activate this in Details of the RF‑/TIMBER Pro add-on module or is it necessary to make additional settings?
I would like to divide a line very finely, but I can only define the minimum of 0.5 mm using the "Divide Line → Distance" function. How can I avoid this problem?
How can I model a timber-concrete composite floor?
The information about the limit time for the fire resistance design R in the RF‑TIMBER Pro add-on module is missing in the printout report. Is it possible to add this information to the printout report?
The Project navigator has been moved to another screen and I cannot manage to display it again. What should I do?
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