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Question
In my model, I obtain different results in comparison with a manual calculation and other software. What could be the reason?
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![Hall with Arched Roof](/en/webimage/024178/3132516/3D-MKP-program.jpg?mw=600&hash=4ba1e9be9b96304bbeba7ba3f7b7f474bf65fa8d)
The new generation of 3D FEA software is used for the structural analysis of members, surfaces, and solids.
![Nonlinear Material Behavior](/en/webimage/024205/3132478/Nelineární-chování-materiálu.jpg?mw=600&hash=ecc32be2353326f887b75603e46a7e519d0ae45a)
The Nonlinear Material Behavior add-on allows you to consider material nonlinearities in RFEM for example, isotropic plastic, orthotropic plastic, isotropic damage).
![Structure Stability](/en/webimage/024206/3132485/Stabilita-konstrukce.jpg?mw=600&hash=5e6ba87ebde4ad9c39f972455c2ee11c0e5c0ced)
The Structure Stability add-on performs stability analysis of structures. It determines critical load factors and the corresponding stability modes.
![Rod Warping Torsion](/en/webimage/027616/3214264/torsion_img.png?mw=600&hash=39500841d35afcf843b991434ebf18654bcefc48)
The Torsional Warping (7 DOF) add-on allows you to consider cross-section warping as an additional degree of freedom.
![Cross-Laminated Timber (CLT) Building](/en/webimage/015352/2975934/Imagen_proyecto_Oscar_Siguenza.png?mw=600&hash=9bfd9fc7330a91fcf88a5f06fbaa3906d81b0f02)
The Multilayer Surfaces add-on allows you to define multilayer surface structures. The calculation can be carried out with or without the shear coupling.
![3D Model of the Vocational School in RFEM (© Eggers Tragwerksplanung GmbH)](/en/webimage/023239/3214286/stahlbeton_modell.png?mw=600&hash=3d473fadc6569419b17f1d00dd699f80a234b6a1)
The two-part Optimization & Costs / CO2 Emission Estimation add-on finds suitable parameters for parameterized models and blocks via the artificial intelligence (AI) technique of particle swarm optimization (PSO) for compliance with common optimization criteria. Furthermore, this add-on estimates the model costs or CO2 emissions by specifying unit costs or emissions per material definition for the structural model.
![Belt Connection, Stress](/en/webimage/027623/3214361/spannung_analyse.png?mw=600&hash=95091fff01758b42b3cd78f25c4d6227cd411052)
The Stress-Strain Analysis add-on performs general stress analysis by calculating the existing stresses and comparing them with the limit stresses.
![Rendering Reinforcement Bars](/en/webimage/026252/3191272/Screenshot_12-02-2021_11.35.32.png?mw=600&hash=c62976a22dff0b44f119fd2ed8b705774ffb437c)
The Concrete Design add-on allows for various design checks according to international standards. You can design members, surfaces, and columns, as well as perform punching and deformation analyses.
![Add-on "Steel Design"](/en/webimage/024214/3132529/Posouzení-ocelových-konstrukci.jpg?mw=600&hash=3142dfd6f4da9f0422ef6788d2468f04597e63cd)
The Steel Design add-on performs the ultimate and serviceability limit state design checks of steel members according to various standards.
![Timber Structure](/en/webimage/024213/3270516/timber_hall.png?mw=600&hash=2dba577941d4f6a3255fbe014e7c4db1b374f333)
The Timber Design add-on performs the ultimate, serviceability, and fire resistance limit state design checks of timber members according to various standards.
![Masonry Design](/en/webimage/024215/3835385/masonry.png?mw=600&hash=2b05b54472bfe37a190fd403aafb47376dbea379)
The Masonry Design add-on for RFEM allows you to design masonry using the finite element method. It was developed as part of the research project titled DDMaS – Digitizing the Design of Masonry Structures. The material model represents the nonlinear behavior of the brick-mortar combination in the form of macro-modeling.
![Aluminum Structure, Deformation](/en/webimage/027624/3214367/aluminium_structure_deformation.png?mw=600&hash=bc9532b28210b80797c7987f1928febda0d14f84)
The Aluminum Design add-on performs the ultimate and serviceability limit state design checks of aluminum members according to various standards.
![Steel Joints for RFEM 6](/en/webimage/047670/3727877/graphic_output_(2).png?mw=600&hash=49b6a289915d28aa461360f7308b092631b1446e)
The Steel Joints add-on for RFEM allows you to analyze steel connections using an FE model. The FE model is generated automatically in the background and can be controlled via the simple and familiar input of components.
![Structural Frame and Truss Analysis Software](/en/webimage/024211/3132506/Program-pro-prutové-konstrukce.jpg?mw=600&hash=c4de97c22127c6d00cdbe3329b8af0d3e9274482)
The modern 3D structural analysis and design program is suitable for the structural and dynamic analysis of beam structures as well as the design of concrete, steel, timber, and other materials.
![Structure Stability](/en/webimage/024206/3132485/Stabilita-konstrukce.jpg?mw=600&hash=5e6ba87ebde4ad9c39f972455c2ee11c0e5c0ced)
The Structure Stability add-on performs the stability analysis of structures. It determines critical load factors and the corresponding stability modes.
![Rod Warping Torsion](/en/webimage/027616/3214264/torsion_img.png?mw=600&hash=39500841d35afcf843b991434ebf18654bcefc48)
The Torsional Warping (7 DOF) add-on allows for considering cross-section warping as an additional degree of freedom when calculating members.
![3D Model of the Vocational School in RFEM (© Eggers Tragwerksplanung GmbH)](/en/webimage/023239/3214286/stahlbeton_modell.png?mw=600&hash=3d473fadc6569419b17f1d00dd699f80a234b6a1)
The two-part Optimization & Costs / CO2 Emission Estimation add-on finds suitable parameters for parameterized models and blocks via the artificial intelligence (AI) technique of particle swarm optimization (PSO) for compliance with common optimization criteria. Furthermore, this add-on estimates the model costs or CO2 emissions by specifying unit costs or emissions per material definition for the structural model.
![Belt Connection, Stress](/en/webimage/027623/3214361/spannung_analyse.png?mw=600&hash=95091fff01758b42b3cd78f25c4d6227cd411052)
The Stress-Strain Analysis add-on performs a general stress analysis by calculating the existing stresses and comparing them to the limit stresses.
![Rendering Reinforcement Bars](/en/webimage/026252/3191272/Screenshot_12-02-2021_11.35.32.png?mw=600&hash=c62976a22dff0b44f119fd2ed8b705774ffb437c)
Concrete Design add-on allows for various design checks of members and columns according to international standards.
![Add-on "Steel Design"](/en/webimage/024214/3132529/Posouzení-ocelových-konstrukci.jpg?mw=600&hash=3142dfd6f4da9f0422ef6788d2468f04597e63cd)
The Steel Design add-on performs the ultimate and serviceability limit state design checks of steel members according to various standards.
![Timber Structure](/en/webimage/024213/3270516/timber_hall.png?mw=600&hash=2dba577941d4f6a3255fbe014e7c4db1b374f333)
The Timber Design add-on performs the ultimate, serviceability, and fire resistance limit state design checks of timber members according to various standards.
![Aluminum Structure, Deformation](/en/webimage/027624/3214367/aluminium_structure_deformation.png?mw=600&hash=bc9532b28210b80797c7987f1928febda0d14f84)
The Aluminum Design add-on performs the ultimate and serviceability limit state design checks of aluminum members according to various standards.