Direct displacement-based seismic design of flexible-base structures subjected to pulse-like ground motions. (1st August 2018)

• Record Type: Journal Article
• Authors: Lu, Yang; Hajirasouliha, Iman; Marshall, Alec M.
• Is Part Of: Engineering structures. Volume 168(2018)
• Page Start: 276
• Page End: 289
• Publication Date: 2018-08-01
• Subjects: Direct-displacement based design -- Soil-structure interaction -- Velocity pulse -- Near-fault ground motion -- Inelastic spectra; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.04.079
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A new concept of constructing compatible response spectra is presented. Closed-form expressions are derived for estimating foundation radiation damping. DDBD procedures for SSI systems subjected to pulse-like motions are proposed. Structures designed using fixed and flexible-base assumptions are evaluated. Using inelastic spectra provides better design solutions than using linearisation. Abstract: In this paper, a practical displacement-based framework is presented for seismic design of flexible-base structures in near-fault regions. Particular attention is given to pulse-like motions that may cause significant damage to building structures. The proposed design methodology utilises displacement response spectra constructed using a new procedure, which takes into account the effect of pulse period. An equivalent fixed-base single-degree-of-freedom oscillator is adopted to capture the salient features of an actual soil-structure interaction (SSI) system in order to facilitate the design process. Two step-by-step direct-displacement based design (DDBD) procedures based on compatible inelastic spectra and equivalent linearisation are introduced. The effectiveness of the stated design procedures is examined using results of nonlinear response history analysis of two example SSI systems subjected to a set of sixteen spectrum-compatible near-fault pulse-like ground motions. The results of this study suggest that the procedure based on inelastic design spectra, in general, provides a better design solution than using an elastic linearisation method, especially when structures are designed with a higher ductility demand.