Modal Analysis

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Modal Analysis for RFEM 6

Natural frequency vibrations can be very dangerous for construction projects. Therefore, the analysis of natural frequencies is very important for the long-term stability of your project. The Modal Analysis add-on for RFEM 6 allows you to determine natural frequencies and mode shapes of member, surface, and solid models.

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Features

The program allows you to quickly and conveniently analyze natural frequencies and mode shapes for member, surface, and solid models. All required input values are imported directly from the main program RFEM/RSTAB.

Automatic consideration of masses from self-weight
Optional definition of additional masses (nodal, linear, or surface masses, as well as inertia masses) directly in the load cases
Preset combination coefficients for various standards (EC 8, SIA 261, ASCE 7,...)
Consideration of failed supports or members/surfaces/solids
Definition of several modal analyses (for example, to analyze different masses or stiffness modifications)
Selection of mass matrix type (diagonal matrix, consistent matrix, unit matrix), including user-defined specification of translational and rotational degrees of freedom
Methods for determining the number of mode shapes (user-defined, automatic—to reach effective modal mass factors, automatic—to reach the maximum natural frequency—available in RSTAB only)
Determination of mode shapes and masses in nodes or FE mesh points
Results of eigenvalue, angular frequency, natural frequency, and period
Masses in mesh points displayed in tables and graphics
Visualization and animation of mode shapes
Various scaling options for mode shapes
Documentation of numerical and graphical results in printout report

Hardware and System Requirements

Global deformation modal analysis of container structure simulation by Modular Structural Consultants LLC.

Modal Analysis of Container Structures | © Modular Structural Consultants LLC

Modal Analysis of Steel Frame Structures

Modal Analysis of Multi-Story Reinforced Concrete Buildings

Printout Report in RFEM 6 with Results of Modal Analysis

Modal Analysis of Container Structures | © Modular Structural Consultants LLC

Modal Analysis of Steel Frame Structures

Modal Analysis of Multi-Story Reinforced Concrete Buildings

Printout Report in RFEM 6 with Results of Modal Analysis

Modal Analysis of Container Structures | © Modular Structural Consultants LLC

Advantages

Automatic combination of masses according to the specified standard (EC 8, SIA 261, ASCE 7, ...)
Optional neglect of masses (for example, mass of foundations)
Optional import of initial states (for example, to consider prestress and imperfections)

Definition of several modal analyses (for example, to analyze different masses or stiffness modifications)
Output of an eigenvalue, angular frequency, natural frequency and period, modal masses, and effective modal mass factors
Masses in mesh points displayed in tables and graphics

Modal Analysis for RFEM 6

Reinforced Concrete Building with Steel Extension

Here you can get the model of a concrete structure with a steel extension to which the modal analyzes in RFEM 6 have been applied.

Industrial Steel Structure

Try your hand at modal analysis with this model of a steel frame structure.

Multi-Story Reinforced Concrete Building

Can the model of a multi-story reinforced concrete building withstand seismic loads? Download the model and find out!

FAQ 005158 | How can I neglect masses in my modal analysis in RFEM 6/RSTAB 9?

Concrete Structure

Download the model of a concrete structure here and open it in the structural FEA software RFEM.

Other Models

Input

In the modal analysis settings, you have to enter all data that are necessary for the determination of the natural frequencies.

You can manually define additional masses at nodes, lines, members, or surfaces. Furthermore, you can influence the stiffness matrix by importing axial forces or stiffness modifications of a load case or load combination.

More Info

Results

As soon as the program has completed the calculation, the eigenvalues, natural frequencies and periods are listed. These result windows are integrated in the main program RFEM/RSTAB. You can find all mode shapes of the structure in tables and also have an option to display them graphically and to animate them.

More Info

Fantastic and Professional Support

I would just like to send a quick note to wish everyone at Dlubal well, in particular I would like to say thank you for the fantastic, thorough and professional support you provide.

Powerful, easy to use, easy to learn…

We adopted Dlubal in our work and haven't looked back. Powerful, easy to use, easy to learn, with mercifully simple output (once set up).