Elastic Surface Foundation with High Spring Constant
Answer
The direct input of a spring constant of the surface foundation is possible with a maximum of 2*108 kN/m3.
However, you can edit the stiffnesses of your surface supports in your load cases or even load combinations. If you multiply the value of the spring constant by the factor 5, you can also see a stiffer support in the results.
Pay attention to the control of the stiffness modification, as explained in FAQ 4212.
Keywords
Increase surface foundation Multiply surface foundation High value
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Timber Beam-Column Design per NDS 2018 Using RF-/TIMBER AWC Module
In this article, the adequacy of a 2x4 dimension lumber subject to combined bi-axial bending and axial compression is verified using RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
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Increased Calculation Performance by Reducing the Nodal Degrees of Freedom
The number of degrees of freedom in a node is no longer a global calculation parameter in RFEM (6 degrees of freedom for each mesh node in 3D models, 7 degrees of freedom for the warping torsion analysis). Thus, each node is generally considered with a different number of degrees of freedom, which leads to a variable number of equations in the calculation.
This modification speeds up the calculation, especially for models where a significant reduction of the system could be achieved (e.g. trusses and membrane structures).
- Is it possible to switch off the minimum internal forces when displaying a result diagram so that the maximum values are only displayed?
- I do not want to design a cross-section in the RF‑/STEEL EC3 add-on module. Can I quickly remove this cross-section from the selection?
- I design a set of members by using the equivalent member method in RF‑/STEEL EC3, but the calculation fails. The system is unstable, delivering the message "Non-designable - ER055) Zero value of the critical moment on the segment."What could be the reason?
- I would like to define a line support with ineffective tension and apply the tension force on this line by using a nodal support instead. Why does the line support still receive a tension force?
- A single-span beam consisting of several apparently straight members receives small torsional moments in the load case of "dead load." Why?
- Does the program check the lap length of the vertical stirrups of a block foundation with smooth bucket sides?
- When comparing RF‑CONCRETE Columns with another design software, I get different results. How to explain the differences?
- My aim is to mesh a circular hole plate in a mapped way. Is such a meshing possible in RFEM?
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The design criterion for VEd/VRd,c is displayed as governing, although there should be a shear reinforcement designed. Also, the design of VEd/VRds is missing. Why?
- Which calculation method is the basis for the stability analysis in RF‑CONCRETE Columns?
