The RFEM5 and RSTAB8 programs offer a "Spring" option when defining a member under the member types.
KB 00693 | “Spring” Member Type
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!["Spring" Member Type](/en/webimage/010409/3011652/01-en.png?mw=512&hash=65e98cfe859ce35a3e3e9da47a0ef9335401520e)
The RFEM5 and RSTAB8 programs offer a "Spring" option when defining a member under the member types.
![Saving and Importing Diagrams for Member Hinges](/en/webimage/010427/2984202/01-EN.png?mw=512&hash=17127434c06258f349409b3e8f047f6d0e8c4ea7)
In RFEM 5 and RSTAB 8, it is possible to assign nonlinearities to member hinges. In addition to the nonlinearities "Fixed if" and "Partial activity", you can select "Diagram". If you select the "Diagram" option, you have to specify the according settings for the activity of the member hinge. For the individual definition points, it is necessary to specify the abscissa and ordinate values (deformations or rotations and the according internal forces) that define the hinge.
![KB 001877 | ASCE 7-22 and NBC 2020 Seismic P-Delta Considerations in RFEM 6](/en/webimage/048528/3803808/Image_01_-_Interstory_Drifts.png?mw=512&hash=dda93b6dc2bff834091aa0c09a68a55dab800606)
The ASCE 7-22 Standard [1], Sect. 12.9.1.6 specifies when P-delta effects should be considered when running a modal response spectrum analysis for seismic design. In the NBC 2020 [2], Sent. 4.1.8.3.8.c gives only a short requirement that sway effects due to the interaction of gravity loads with the deformed structure should be considered. Therefore, there may be situations where second-order effects, also known as P-delta, must be considered when carrying out a seismic analysis.
![KB 001874 | LTB Analysis According to ADM 2020 Section F.4 in RFEM 6](/en/webimage/048099/3772420/2024-03-18_15-43-26.png?mw=512&hash=418d15db74dbdf280bc2956def625d5b0eb8704f)
Lateral-Torsional Buckling (LTB) is a phenomenon that occurs when a beam or structural member is subjected to bending and the compression flange is not sufficiently supported laterally. This leads to a combination of lateral displacement and twisting. It is a critical consideration in the design of structural elements, especially in slender beams and girders.
![Feature 002426 | Animation of Deformation](/en/webimage/032091/3328083/AnimationRFEM6_EN.jpg?mw=512&hash=ecf9e52031e929ead1b99a37bfa7e0b1c3a2f4f2)
The deformation process of the global deformation components can be represented as a movement sequence.
![Feature 002421 | Displaying Result Values on Isolines](/en/webimage/031922/3325367/Isolinien_EN.jpg?mw=512&hash=7128e1d3476cede4a52641e47eb2532fdaa44a70)
Result values for deformations, internal forces, stresses, and so on, can be displayed on the isolines.
![Feature 002423 | Displaying Results in Solids](/en/webimage/031923/3325382/FE_Solid_EN.jpg?mw=512&hash=d2950a5e2123942fab13aad296e814c67695c955)
The results of solid stresses can be displayed as colored 3D points in the finite elements.
![Feature 002430 | Grid for Solid Results](/en/webimage/031750/3319543/Solid_EN_1.jpg?mw=512&hash=bdf74bca532ea70d85d73883e2ee290cfa3ef9a9)
In addition to the "Mesh Refinement" and "Specific Direction" options for solids, you can also activate the "Grid for Results" option, which allows for organizing grid points in the solid space. Among other things, the center of gravity can be set as the origin. There is also the option to activate or deactivate the visibility of the grid for numerical results in "Navigator – Display" under Basic Objects.
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