Song, B;
Galasso, C;
(2020)
Directivity-Induced Pulse-Like Ground Motions and Fracture Risk of Pre-Northridge Welded Column Splices.
Journal of Earthquake Engineering
10.1080/13632469.2020.1772154.
(In press).
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Abstract
Recent worldwide earthquakes have emphasized the severe damage potential of pulse-like ground motions caused by forward directivity close to a fault rupture. We investigate the effect of such directivity-induced pulse-like ground motions on the fracture fragility and fracture risk of pre-Northridge welded column splices (WCSs) in near-fault regions. To this aim, incremental dynamic analysis (IDA) is employed to explicitly quantify the pulse effects on WCS stress demands. Two case-study nonlinear welded-steel-moment-resisting-frame (WSMRF) models featuring WCSs (i.e., 4 and 20 story) are developed and subjected to (1) a set of pulse-like ground motions with varying pulse periods; and (2) a suite of ordinary (i.e., non-pulse-like) ground motions. Fracture fragility curves for both ordinary and pulse-like records are then derived from the IDA results. These are finally combined with state-of-the-art near-source probabilistic seismic hazard analysis (NS-PSHA) for a case-study scenario rupture and six representative near-fault sites to assess WCS fracture risk. Findings from the study highlight that directivity-induced pulse-like ground motions affect the estimated fracture fragility and potentially increase the fracture risk of pre-Northridge WCSs in near-fault regions. These findings can guide similar performance-based assessment exercises for WSMRFs to inform, for instance, the planning and design of retrofitting strategies for those vulnerable connections in near-fault regions.
| Type: | Article |
|---|---|
| Title: | Directivity-Induced Pulse-Like Ground Motions and Fracture Risk of Pre-Northridge Welded Column Splices |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/13632469.2020.1772154 |
| Publisher version: | https://doi.org/10.1080/13632469.2020.1772154 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Pre-Northridge welded column splice, fracture fragility/risk, pulse-like ground-motions, NS-PSHA |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10109202 |
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