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KB 001615 | Options for considering accidental torsional effects according to standards
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Description
In order to consider inaccuracies regarding the position of masses in a response spectrum analysis, the standards for seismic design specify rules that have to be applied in both the simplified and the multimodal response spectrum analysis. These rules describe the following general procedure: The story mass must be shifted by a certain eccentricity, which results in a torsional moment.
Keywords
Dlubal Knowledge Base Dynamic analysis Earthquake Response spectrum Torsion Mass Story Dlubal KB Knowledge Base Technical Contribution
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This technical article deals with the component and cross-section designs of a welded truss in the ultimate limit state. Furthermore, the deformation analysis in the serviceability limit state is described.
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Conversion of Lehr's Damping into Rayleigh Damping
Calculation with consideration of a damping ratio (or Lehr's damping) is not possible in the direct time step integrations. Instead, the Rayleigh damping coefficients must be specified by the user.
In technical literature, the given damping ratio for specific construction forms is in many cases only a rough approximation of the real damping ratios. In RF-/DYNAM Pro - Forced Vibrations, it is possible to use the value of damping ratio to determine the Rayleigh damping. This may occur at one or two natural angular frequencies defined by the user.
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