Seismic Response Amplification Due to Near-Field Ground Motions

Abstract eng:
The effect of rupture directivity at near-fault sites is investigated. The study compares the ratio of maximum inelastic to maximum elastic displacement demand, CR, for a wide range of SDOF systems subjected to fault-normal, near-field ground motions. Oscillators with both bilinear and quadrilinear backbones are considered. The quadrilinear oscillators include an elastic, a hardening and a negative stiffness branch that terminates at a horizontal plateau, and therefore this modelling is more suitable for simulating the real-world buildings, which degrade. A sensitivity analysis of the parameters that describe the SDOF systems is performed in order to study their effect on CR. It is demonstrated how the seismic response varies with respect to the backbone parameters, the period and the seismic demand. The results show that the bilinear approximation, which is the common, underestimates the ductility demand compared to the quadrilinear case, regardless of the seismic intensity and the backbone parameters.

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