DYNAM Addition I 7.xx - Dlubal Software

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Structural Analysis and Design Software

Steel Structures
Concrete Structures
Timber Structures

Glass Structures
Plant Engineering
Mechanical Engineering

Interfaces, Data Exchange
Dynamic Analysis

Updated:

05/09/2012

Cross-References

Related programs

	RSTAB add-on module for analysis of eigenvibrations

	Extension for DYNAM Basic for generation of equivalent seismic loads

DYNAM Basic DYNAM Addition II

Products - Overview

DYNAM Addition I 7.xx

Forced Vibration Analysis

DYNAM Addition I is used to analyze structures for their dynamic behavior due to external excitation. The program analyzes forced vibrations resulting from earthquakes in accordance with the multi-modal response spectrum method. Furthermore, you can take advantage of this module to simulate impacts and crashes or to analyze excitations of machines.

The excitation functions can be defined by time histories of forces or moments, by accelerations (accelerogram) or by harmonic functions. Alternatively, you can specify the excitation by defining a response spectrum. In the results display, the program shows internal and support forces, deformations, deformation velocities and accelerations either in the form of a time history or as extreme values. To start the analysis, DYNAM Addition I needs the eigenmodes from DYNAM Basic.


Features Definition of up to 200 excitation cases which can be stored in libraries Tabular loads for entering time-dependent forces (single forces and moments) Harmonic forces for defining a force function f(t) and a moment function m(t), specifying amplitude, angular frequency and phase shift Accelerograms for excitations of the structure's support nodes by time-dependent accelerations Response spectra for analyzing the structure affected by seismic support node excitation according to the modal-analytical response spectrum method Consideration of modal damping Consideration of initial deformations and velocities Load factors for different global directions Combination of several independent excitation force functions in one single dynamic load case Export option for all results in user-defined time steps or as decisive enveloping load combination to RSTAB for superposition in further load combinations Option to stress nodes by different excitation types simultaneously Automatic generation of response spectra taking into account viscous damping Damping coefficient for mass and stiffness matrix Rules for superpositioning in the response spectrum analysis following square root of sum of squares (SRSS rule) or complete quadratic combination (CQC rule) Efficient Newmark-Wilson integration for determination of dynamic behavior Graphical representation of the excitation's time history with print option Graphical evaluation of results by means of time represented in diagrams for particular locations of the structure Extendable library with elastic response spectra according to DIN 4149, EC 8 and UBC 97


Input To determine the dynamic behavior of the structure, DYNAM Addition I performs the efficient Newmark-Wilson integration. The equation of motion is previously projected on the subspace which is spanned by the eigenvectors. This method is characterized by high accuracy and a reliable calculation.


Calculation With DYNAM Addition I, and especially with the response spectrum analysis, you can determine additional actions due to earthquakes more or less independently from the standard. In case some response spectra are not available in the library, you can enter user-defined spectra of any standard in the module.


Results Because of the module's integration in RSTAB, it is possible to include the results numerically and graphically in the RSTAB printout report. In addition, you can use all options from RSTAB to display the results in the graphic.


2.2 Eigenvibrations	2.5 Equivalent Mass Factors	2.7 Internal Forces	2.9 Node Deformations

2.10 Node Velocities	2.11 Node Accelerations	Graphics with deformations and internal forces	Animation of deformations

Note

You can find more information about DYNAM Addition I here:

	Manual
	Hotline
	Training

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