Time history, ground acceleration

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Use Time history, ground acceleration to analyse the structural response to ground-induced accelerations over time.

• Setup… – opens the Time history, ground acceleration options dialogue

Time history, ground acceleration – setup

Calculations

• Level acceleration spectra – enables calculation of the acceleration response spectra

  • ΔT – time step for the spectra
  • T end – end time for the spectra
  • q – behaviour factor

• Time history calculation – enables full time-domain calculation

  • Save every nth step – save results at every nth time step
  • t end – total duration of the time-history analysis

Integration scheme

Choose the numerical integration method used for the time-domain solution:

• Newmark – default integration scheme
• Wilson-Θ – alternative integration method with additional numerical damping

Rayleigh damping matrix

• α – mass-proportional damping coefficient
• β – stiffness-proportional damping coefficient

Damping factor

• ξ – percentage damping used in the response spectra calculation