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cvd020 mohr's circle structural dynamics viscoelastic damping laguerres polynomial approximation lpa technique jourawski's formula fourier series fast fourier transform fourier transform beam loughborough earthquake engineering generalised maxwell model earthquake engineering;harmonic wavelet analysis;r eurocode 1 wind loads relaxation function energy dissipation modal strain energy mse method additional internal variable numerical scheme vibration analysis transition matrix statespace formalism strain gauges complex strains principal directions of strain principal directions of stress complex stresses principal second moment of area product moment of area matlab sap2000 photogrammetry composite beams blurred images moving loads strength stiffness rankine's failure load euler's critical load colums structural mechanics; jourawski's formula; shear c shear stress cva005 loughborough university dynamics of structures