PSI - Issue 26

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 il l li t . i ir t. tr t r l I t rit r i ( )

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ScienceDirect

Procedia Structural Integrity 26 (2020) 393–401

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© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers Abstract Robustness of structures is fundamental to limit progressive collapse of buildings in case of accidental loss of columns due to explosions, impacts or materials deterioration. Modelling of progressive collapse response of reinforced concrete (RC) frame structures needs considering extreme geometric and mechanical nonlinearities. Moreover, in the case of infilled frames the collapse mechanism becomes more complex because of the frame-infill interaction. This paper presents a numerical study aimed at proposing: a) an appropriate fiber-section modeling methodology for reinforced concrete frames under large displacement progressive collapse events; b) a new multi-strut fiber macro-element model to account for the influence of masonry infills in the progressive collapse response. Proposed numerical models are developed using the OpenSees software platform. The predictive capacity of the proposed methodology is widely validated in the paper through comparisons with experimental test results and refined numerical simulation pushdown test results. Results show that the new equivalent-strut modeling approach can be suitably employed as a simple assessment method when numerical simulation of progressive collapse scenarios is needed for bare and infilled reinforced concrete frames. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers Keywords: Progressive collapse; pushdown; robustness; infills; reinforced concrete. 1. Introduction In the last years, the interest in structural robustness and progressive collapse analysis of constructions is rapidly growing within the scientific community and in practice engineering. For civil structures having residential, commercial st t st ss f str t r s is f t l t li it r r ssi ll s f il i s i s f i t l l ss f l s t l si s, i ts r t ri ls t ri r ti . lli f r r ssi ll s r s s f r i f r r t ( ) fr str t r s s si ri tr tri i l li riti s. r r, i t s f i fill fr s t ll s is s r l s f t fr -i fill i t r ti . is r r s ts ri l st i t r si : ) r ri t fi r-s ti li t l f r r i f r r t fr s r l r is l t r r ssi ll s ts; ) lti-str t fi r r - l t l t t f r t i fl f s r i fills i t r r ssi ll s r s s . r s ri l ls r l si t s s ft r l tf r . r i ti it f t r s t l is i l li t i t r t r ris s it ri t l t st r s lts r fi ri l si l ti s t st r s lts. s lts s t t t i l t-str t li r s it l l s si l ss ss t t ri l si l ti f r r ssi ll s s ri s is f r r i fill r i f r r t fr s. t rs. P lis ls i r . . is is open access article under the CC BY-NC-ND licens ( tt :// r ti s. r /li s s/ - - / . /) r-r i r r s si ilit f r t r i rs r s: r r ssi ll s ; s ; r st ss; i fills; r i f r r t . . t ti I t l t r , t i t r t i tr t r l r t r r i ll l i f tr ti i r i l r i it i t i tifi it i r ti i ri . r i il tr t r i r i ti l, r i l The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Modelling failure analysis of RC frame structures with masonry infills under sudden column losses Fabio Di Trapani a *, Luca Giordano a , Giuseppe Mancini a , Marzia Malavisi a a Department of Structural, Building and Geotechnical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Italy t t l t it , t a , a , a , a a rt t f tr t r l, il i t i l i ri , lit i i ri , rs li r zzi , , It l it t

* Corresponding author. Tel.: +39-011-090-5323; fax: +39-011-090-5323. E-mail address: fabio.ditrapani@polito.it i t r. l.: - - - ; f : - - - . - il r ss: f i . itr i lit .it rr s

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2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers is is ss rti l r t - - li s ( tt :// r ti s. r /li s s/ - - / . /) r-r i r r s si ilit f r t r i rs

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers 10.1016/j.prostr.2020.06.050