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Open AccessFeature PaperArticle

Application of the Incremental Modal Pushover Analysis to Bridges Subjected to Near-Fault Ground Motions

1
Department of Architecture, Roma Tre University, 00153 Rome, Italy
2
College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(19), 6738; https://doi.org/10.3390/app10196738
Received: 1 September 2020 / Revised: 21 September 2020 / Accepted: 23 September 2020 / Published: 26 September 2020
(This article belongs to the Special Issue Effects of Near-Fault Ground Motions on Civil Infrastructure)
Near-fault events can cause severe damage to civil structures, including bridges. Many studies have demonstrated that the seismic assessment is not straightforward. Usually, dealing with near-fault ground motion, the structural analysis is performed using Nonlinear Response-History Analysis (NRHA) but in the last years, many authors have tested existing pushover-based procedures originally developed and validated using far-field events. Between those procedures, the Incremental Modal Pushover Analysis (IMPAβ) is a pushover-based procedure specifically developed for bridges that, in this work, was applied to a case study considering near-fault pulse-like ground motion records. The records were analyzed and selected from the European Strong Motion Database. In the paper the results obtained with IMPAβ together with other standard pushover procedures, are compared with NRHA and incremental dynamic analyses; the vertical component of the motion has been also considered. Results obtained with the bridge case study demonstrate that the vertical seismic action has a minor influence on the structural response and that IMPAβ is confirmed as a very effective pushover-based method that can be applied also for near-fault events. View Full-Text
Keywords: near-field; pulse-like ground motions; bridge; nonlinear static analysis; nonlinear dynamic analysis near-field; pulse-like ground motions; bridge; nonlinear static analysis; nonlinear dynamic analysis
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Bergami, A.V.; Fiorentino, G.; Lavorato, D.; Briseghella, B.; Nuti, C. Application of the Incremental Modal Pushover Analysis to Bridges Subjected to Near-Fault Ground Motions. Appl. Sci. 2020, 10, 6738.

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