In the present study, the incremental modal pushover analysis (IMPAβ), a pushover-based approach already proposed and applied to buildings by the same authors, was revised and proposed for bridges (IMPAβ). Pushover analysis considers the effects of higher modes on the structural response. Bridges are structurally very different from multi-story buildings, where multimodal pushover (MPA) has been developed and is currently used. In bridges, consideration for higher modes is often necessary: The responses of some structural elements of the bridge (e.g., piers) influence the overall bridge response. Therefore, the failure of these elements can determine the failure of the whole structure, even if they give a small contribution total base shear. Incremental dynamic analysis (IDA) requires input accelerograms for high intensities, which are rare in the databases, while scaling of generated accelerograms with a simple increment of the scaling acceleration is not appropriate. This fact renders IDA, which is by its nature time-consuming, not straightforward. On the contrary, the change of input spectrum required by IMPA is simple. IMPAβ also utilizes a simple complementary method coupled to MPA, to obtain bounds at very high seismic intensities. Finally, the two incremental methods based on static nonlinear and dynamic nonlinear analyses are compared.

IMPAβ: Incremental modal pushover analysis for bridges / Bergami, Av; Nuti, C; Lavorato, D; Fiorentino, G; Briseghella, B. - In: APPLIED SCIENCES. - ISSN 2076-3417. - 10:12(2020), pp. N/A-N/A. [10.3390/app10124287]

IMPAβ: Incremental modal pushover analysis for bridges

Briseghella B
2020

Abstract

In the present study, the incremental modal pushover analysis (IMPAβ), a pushover-based approach already proposed and applied to buildings by the same authors, was revised and proposed for bridges (IMPAβ). Pushover analysis considers the effects of higher modes on the structural response. Bridges are structurally very different from multi-story buildings, where multimodal pushover (MPA) has been developed and is currently used. In bridges, consideration for higher modes is often necessary: The responses of some structural elements of the bridge (e.g., piers) influence the overall bridge response. Therefore, the failure of these elements can determine the failure of the whole structure, even if they give a small contribution total base shear. Incremental dynamic analysis (IDA) requires input accelerograms for high intensities, which are rare in the databases, while scaling of generated accelerograms with a simple increment of the scaling acceleration is not appropriate. This fact renders IDA, which is by its nature time-consuming, not straightforward. On the contrary, the change of input spectrum required by IMPA is simple. IMPAβ also utilizes a simple complementary method coupled to MPA, to obtain bounds at very high seismic intensities. Finally, the two incremental methods based on static nonlinear and dynamic nonlinear analyses are compared.
2020
10
12
N/A
N/A
IMPAβ: Incremental modal pushover analysis for bridges / Bergami, Av; Nuti, C; Lavorato, D; Fiorentino, G; Briseghella, B. - In: APPLIED SCIENCES. - ISSN 2076-3417. - 10:12(2020), pp. N/A-N/A. [10.3390/app10124287]
Bergami, Av; Nuti, C; Lavorato, D; Fiorentino, G; Briseghella, B
File in questo prodotto:
File Dimensione Formato  
applsci-10-04287-v2.pdf

Open access

Tipologia: Versione pubblicata dall'editore
Dimensione 9.79 MB
Formato Adobe PDF
9.79 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1287378
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 9
social impact