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Validation of an analytical displacement-based pushover for multi-span continuous deck bridges

Nettis, A; Gentile, R; Uva, G; Raffaele, D; (2019) Validation of an analytical displacement-based pushover for multi-span continuous deck bridges. In: Papadrakakis, M and Fragiadakis, M, (eds.) COMPDYN Proceedings. COMPDYN: Crete, Greece. Green open access

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Abstract

In the framework of seismic vulnerability assessment, the displacement-based analytical approaches allow the investigation of the non-linear response of structures with accuracy and low computational effort. This paper deals with a recently-proposed displacement-based analytical pushover addressed to the seismic performance assessment of multi-span continuousdeck straight bridges. The method consists in the static analysis of a simplified mechanical model for increased displacements (pseudo pushover) and allows to obtain an “adaptive” force-displacement curve. This procedure is applied to a set of 36 short bridge configurations representing typical Italian typologies (2 to 6 bays, with two deck configurations and different height of the piers). This work aims to test the method for different hazard intensities, also discussing the influence of bridge regularity in the predicted seismic performance. The accuracy of the DBA procedure is evaluated comparing it with more refined pushover and nonlinear time history analyses. Three different suites of 10 natural ground motions, scaled to different intensity levels, are adopted. The results are discussed in terms of capacity/demand checks and predicted deformed shape, proving that the DB pseudo pushover provides approximately the same level of accuracy expected for standard non-linear static analyses.

Type: Proceedings paper
Title: Validation of an analytical displacement-based pushover for multi-span continuous deck bridges
Event: COMPDYN 2019 - 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
ISBN-13: 9786188284463
Open access status: An open access version is available from UCL Discovery
Publisher version: https://2019.compdyn.org/proceedings/
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Seismic Assessment, Displacement-based Assessment, Pushover analysis, Timehistory analysis, Simplified Mechanical Model, RC continuous-deck bridges
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: https://discovery.ucl.ac.uk/id/eprint/10095098
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