Haiying Qi
Powerful and Efficient Software
Your software is powerful, convenient, efficient, the concept and theory of the structure is very clear, and I have learned a lot through using this software. For example, the modeling of the cable is very efficient and convenient. In SAP2000, either the members are used to simulate the cables and the prestress is added by temperature reduction, or the cables have to be drawn out one by one. In RFEM, in the curved surface panel, you can directly add the supports perpendicular to the curves. This is very efficient. RFEM can also calculate the membrane structure, including the air pillow type of membrane structure; it is really full-featured.
Do you have any questions?
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In this article, you will learn how to model and design cable structures in RFEM 6 or RSTAB 9.
This article describes and explains the influence of bending stiffness of cables on their internal forces. Furthermore, the text provides information on how this influence can be reduced.
To evaluate whether it is also necessary to consider the second-order analysis in a dynamic calculation, the sensitivity coefficient of interstory drift θ is provided in EN 1998‑1, Sections 2.2.2 and 4.4.2.2. It can be calculated and analyzed using RFEM 6 and RSTAB 9.
The coefficient θ is calculated as follows:$$\mathrm\theta\;=\;\frac{\displaystyle{\mathrm P}_\mathrm{tot}\;\cdot\;{\mathrm d}_\mathrm r}{{\mathrm V}_\mathrm{tot}\;\cdot\;\mathrm h}\;$$
The coefficient θ is calculated as follows:$$\mathrm\theta\;=\;\frac{\displaystyle{\mathrm P}_\mathrm{tot}\;\cdot\;{\mathrm d}_\mathrm r}{{\mathrm V}_\mathrm{tot}\;\cdot\;\mathrm h}\;$$
For the ultimate limit state design, EN 1998‑1, Sections 2.2.2 and 4.4.2.2 require a calculation considering the second‑order theory (P‑Δ effect). This effect may be neglected only if the interstory drift sensitivity coefficient θ is less than 0.1.
In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.
In RFEM 6 and RSTAB 9, you have the option to enter "Visual Objects" as guide objects. You can import the file formats 3ds, stl, and obj.
These objects allow you to create a better reference to the dimensions.
Mia is accessible in the programs and prevents the hassle of following up by email or phone.
Using the "Dashpot" member type, you can define a damping coefficient, a spring constant, and a mass. This member type extends the possibilities within the Time History Analysis.
With regard to viscoelasticity, the "Dashpot" member type is similar to the Kelvin-Voigt model, which consists of the damping element and an elastic spring (both connected in parallel).
How do I reset the display settings to default?
Why are the maximum deformations not displayed?
How many updates does Dlubal provide for RFEM 6 / RSTAB 9 each month?
Where in RFEM 6 can I find the calculation parameters?
How can I model a timber beam with stiffening on both sides? (splice)
Has the RF-TOWER add-on module for RFEM 5 already been added to RFEM 6?
