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- W2389424451 abstract "Based on dynamic analyses of seismic response by using plane-strain FEM and evaluation of seismically-induced sliding movement of embankments,the overall effects of simultaneous horizontal and vertical acceleration on aseismic stability of embankments are examined.First,the variation of the safety factor of embankments with time is estimated on the basis of numerical results achieved by finite element analyses and therefore the transient stability performance of embankment can be assessed.When the transient safety factor is below unity for a period of time,a certain permanent movement of potential sliding block will occur and Newmark′s rigid-plastic model is used to evaluate the seismically-induced movement.The overall seismic stability of embankment can be described by the total permanent sliding displacement of the embankment.Based on the proposed method,numerical analyses are made for an example embankment with height of 100 m.Harmonic excitation and acceleration record obtained in El-Centro earthquake are used as the input ground motions.Different combinations of horizontal and vertical components in amplitudes and phase-differences are chosen for comparative analyses.It is shown that the effect of vertical acceleration component will considerably affect both the transient safety factors and overall movements.It seems that the effect of vertical seismic acceleration and its combination with horizontal seismic acceleration can not be overlooked in the earthquake-resistant design of embankment.It should be noted that the conventional understanding on vertical seismic effect is not perfect and sometime will yield a certain non-conservative assessment of earthquake-resistant behaviour of embankment." @default.
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- W2389424451 date "2006-01-01" @default.
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- W2389424451 title "Analyses of effects of vertical acceleration on aseismic stability and seismically-induced sliding movement of embankments" @default.
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