Repository logo
 

Inelastic displacement ratios for non-structural components in steel framed structures under forward-directivity near-fault strong-ground motion

Published version
Peer-reviewed

Type

Article

Change log

Authors

Bravo-Haro, MA 
Virreira, JR 
Elghazouli, AY 

Abstract

jats:titleAbstract</jats:title>jats:pThis paper describes a detailed numerical investigation into the inelastic displacement ratios of non-structural components mounted within multi-storey steel framed buildings and subjected to ground motions with forward-directivity features which are typical of near-fault events. The study is carried out using detailed multi-degree-of-freedom models of 54 primary steel buildings with different structural characteristics. In conjunction with this, 80 secondary non-structural elements are modelled as single-degree-of-freedom systems and placed at every floor within the primary framed structures, then subsequently analysed through extensive dynamic analysis. The influence of ground motions with forward-directivity effects on the mean response of the inelastic displacement ratios of non-structural components are compared to the results obtained from a reference set of strong-ground motion records representing far-field events. It is shown that the mean demand under near-fault records can be over twice as large as that due to far-fault counterparts, particularly for non-structural components with periods of vibration lower than the fundamental period of the primary building. Based on the results, a prediction model for estimating the inelastic displacement ratios of non-structural components is calibrated for far-field records and near-fault records with directivity features. The model is valid for a wide range of secondary non-structural periods and primary building fundamental periods, as well as for various levels of inelasticity induced within the secondary non-structural elements.</jats:p>

Description

Keywords

Inelastic displacement ratios, Non-structural components, Steel structures, Near-fault events, Velocity pulses, Forward-directivity effects

Journal Title

Bulletin of Earthquake Engineering

Conference Name

Journal ISSN

1570-761X
1573-1456

Volume Title

19

Publisher

Springer Science and Business Media LLC