Effects of forward directivity on the response of soil–structure systems

Abstract

2 3 4The effects of input parameters of pulse-like ground motions on the response of soil-structure systems are investigated through employing an ensemble of 64 ground motions. The soil and superstructure are idealised as a semi-infinite cone and a non-linear multiple-degrees-of-freedom shear building, respectively. The results confirm that the location of the critical storey is significantly affected by the pulse inputs and interacting parameters. Also, the pulse period ranges in which the critical storey complies with upper storeys are influenced considerably by interacting parameters. Moreover, there is a trade-off between pulse period and amplitude to determine the seismic demands of the structure.

Direct displacement-based seismic design of flexible-base structures subjected to pulse-like ground motions

“…In the proposed design approach, the building was simplified into an SDOF structure based on its fixed-base fundamental mode of vibration (which has a similar first mode-shape to the flexible-base counterpart) and higher modes of SSI systems were not considered. Recent research showed that short-period velocity pulses amplified the higher-mode (high-frequency) response flexible-base buildings whose inter-storey drift ratio distribution varied with respective to the pulse periods [67,68]. In fact, higher-mode shapes of fixed-base building can be significantly different compared to those supported on flexible bases.…”