Modal Analysis for RFEM 6 / RSTAB 9

Product Description

  • Time diagram

Analysis of Natural Vibrations

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The Modal Analysis add-on allows you to quickly and comfortably analyze natural frequencies and mode shapes for member, surface, and solid models.

All required input values are imported from RFEM/RSTAB. Powerful eigenvalue solvers (such as Lanczos, subspace iteration, and so on) are available to determine up to 9,999 eigenvalues.


1

Features

  • Automatic consideration of masses from self-weight
  • Direct import of masses from load cases or load combinations
  • Optional definition of additional masses (nodal, linear, or surface masses, as well as inertia masses) directly in the load cases
  • Optional neglect of masses (e.g. mass of foundations)
  • Combination of masses in different load cases and load combinations
  • Preset combination coefficients for various standards (EC 8, SIA 261, ASCE 7,...)
  • Optional import of initial states (e.g. to consider prestress and imperfection)
  • Structure modification
  • Consideration of failed supports or members/ surfaces/ solids
  • Definition of several modal analyses (e.g. 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 - only available in RSTAB)
  • Determination of mode shapes and masses in nodes or FE mesh points
  • Output of eigenvalue, angular frequency, natural frequency, and natural period
  • Output of modal masses, effective modal masses, modal mass factors, and participation factors
  • Tabular and graphical output of masses in mesh points
  • Visualization and animation of mode shapes
  • Various scaling options for mode shapes
  • Documentation of numerical and graphical results in the printout report
2

Input

All the necessary data for the determination of the natural frequencies, such as mass shapes and eigenvalue solvers is entered in the modal analysis settings.

The Modal Analysis add-on determines the lowest eigenvalues of the structure. The number of eigenvalues can be adjusted or automatically determined to reach either effective modal mass factors or maximum natural frequencies. Masses are directly imported from load cases or load combinations (with the option to consider the total mass, load components in global Z-direction, or only the load component in the direction of gravity).

Additional masses can be defined manually at nodes, lines, members, or surfaces. In addition, you can influence the stiffness matrix by importing axial forces or stiffness modifications of a load case or load combination.

3

Calculation

In RFEM, three powerful eigenvalue solvers are available:

  • Root of the characteristic polynomial
  • Method by Lanczos
  • Subspace iteration

In RSTAB, two eigenvalue solvers are available:
  • Subspace iteration
  • Shifted inverse iteration

The selection of the eigenvalue solver primarily depends on the size of the model.
4

Results

After the calculation, the eigenvalues, natural frequencies, and natural periods are listed. These result windows are integrated in the main program RFEM/RSTAB. The mode shapes of the structure are included in tables and can be displayed graphically or as an animation.

All result tables and graphics are part of the RFEM/RSTAB printout report. This ensures clearly structured documentation. In addition, it is possible to export the tables to MS Excel.

Manual of Dynamic Analysis for RFEM 6 / RSTAB 9

Manuals

Price

Price
1,030.00 USD

The price is valid for United States.

Online Training | English

RFEM 6 | Dynamic Analysis and Seismic Design According to EC 8

Online Training 09/21/2022 9:00 AM - 1:00 PM CEST

Online Training | English

RFEM 6 | Dynamic Analysis and Seismic Design According to EC 8

Online Training 11/23/2022 9:00 AM - 1:00 PM CET

ASCE 7-16 Response Spectrum Analysis in RFEM 6

ASCE 7-16 Response Spectrum Analysis in RFEM 6

Webinar 05/05/2022 2:00 PM - 3:00 PM EDT

Online Training | English

RFEM 6 | Dynamic Analysis and Seismic Design According to EC 8

Online Training 03/10/2022 8:30 AM - 12:30 PM CET

Online Training | English

RFEM 6 | Dynamic Analysis and Seismic Design According to EC 8

Online Training 12/22/2021 8:30 AM - 12:30 PM CET

Online Training | English

Eurocode 5 | Timber structures according to DIN EN 1995-1-1

Online Training 09/23/2021 8:30 AM - 12:30 PM CEST

Online Training | English

RFEM | Structural dynamics and earthquake design according to EC 8

Online Training 08/11/2021 8:30 AM - 12:30 PM CEST

Online Training | English

RFEM | Structural dynamics and earthquake design according to EC 8

Online Training 06/02/2021 8:30 AM - 12:30 PM CEST

Online Training | English

Eurocode 5 | Timber structures according to DIN EN 1995-1-1

Online Training 05/20/2021 8:30 AM - 12:30 PM CEST

Blast Time History Analysis in RFEM

Blast Time History Analysis in RFEM

Webinar 05/13/2021 2:00 PM - 3:00 PM EDT

Online Training | English

RFEM | Dynamics | USA

Online Training 03/23/2021 1:00 PM - 4:00 PM EDT

Online Training | English

Eurocode 5 | Timber structures according to EN 1995-1-1

Online Training 03/17/2021 8:30 AM - 12:30 PM CET

Online Training | English

RFEM | Structural dynamics and earthquake design according to EC 8

Online Training 02/24/2021 8:30 AM - 12:30 PM CET

Online Training | English

Eurocode 5 | Timber structures according to EN 1995-1-1

Online Training 12/18/2020 8:30 AM - 12:30 PM CET

Online Training | English

RFEM | Structural dynamics and earthquake design according to EC 8

Online Training 12/10/2020 8:30 AM - 12:30 PM CET

ASCE 7-16 Response Spectrum Analysis in RFEM

ASCE 7-16 Response Spectrum Analysis in RFEM

Webinar 05/22/2019 3:00 PM - 4:00 PM

Nonlinear Time History Analysis in RFEM

Nonlinear Time History Analysis in RFEM

Webinar 05/08/2018 3:00 PM - 4:00 PM EDT

Time-History Analysis in RFEM - Induced Vibrations

Time-History Analysis in RFEM - Induced Vibrations

Webinar 01/26/2017 3:00 PM - 4:00 PM

RSTAB 9
3D Model of Vocational School in RFEM (© Eggers Tragwerksplanung GmbH)

Special Solutions

First, 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. Second, this add-on estimates the model costs or CO2 emissions by specifying unit costs or emissions per material definition for the structural model.

Price of First License
1,480.00 USD
RFEM 6
Cross-Laminated Timber (CLT) Building

Design

The Multilayer Surfaces add-on allows you to define multilayer surface structures. The calculation can be carried out with or without the shear coupling.

Price of First License
1,120.00 USD