PSI - Issue 44

ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDire t Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 44 (2023) 480–487

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. Abstract In this paper, the results of the cyclic experimental tests performed on ductile rectangular reinforced concrete columns with deformed bars are processed to define characteristic points of the lateral base moment – chord rotation response envelope. Four characteristic points are determined: yielding, maximum, conventional ultimate, and collapse. The value of base moment corresponding to these points can be determined based on mechanical principles or is intrinsic to the definition itself of the characteristic points of the response. On the other hand, based on the processed experimental data, empirical equations are derived for calculating chord rotation values corresponding to the four characteristic points. The proposed cyclic response envelope can be implemented in OpenSees by adopting Pinching4 Material model, which also allows modeling the cyclic degradation of unloading stiffness, reloading stiffness, and the pinching effect. Based on the processed experimental data, the hysteretic parameters that should be adopted to model these phenomena are calibrated. The proposed model can be adopted for nonlinear static and dynamic analyses for the seismic assessment of new and existing buildings. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy Keywords: experimental database; empirical equation; cyclic response; response envelope; hysteretic parameter 1. Introduction The development of response models for displacement-based assessment and nonlinear modelling of Reinforced Concrete (RC) members is a key issue both for pre-normative research and for seismic vulnerability/fragility XIX ANIDIS Conference, Seismic Engineering in Italy Empirical modelling of the cyclic response of reinforced concrete columns with deformed bars Mariano Di Domenico a , Paolo Ricci a *, Gerardo M. Verderame a a Department of Structures for Engineering and Architecture, University of Naples Federico II, Via Claudio 21, Naples 80125, Italy Abstract In this paper, the results of the cyclic experimental tests performed on ductile rectangular reinforced concrete columns with deformed ba s ar proce sed o define characteristic points of the lateral base moment – chord rotation response envelope. Four charact ristic points ar determined: yielding, maximum, conven ional ulti ate, and collapse. The value of base moment or esponding t these poin s ca be determined based on mechan cal principles or is intrinsic to the definition itself f the ha acteristic p ints of the respo se. On the other hand, bas d o the pro ess d experime tal data, emp rical equations ar derived for calculating c ord r tation valu s corresponding to the four characteristic points. The proposed cyclic respons envelope can be implemented in OpenSees by ado ti g Pinching4 Material model, which also allows modeling th cyclic degradation of unloading stiffness, reloading stiffness, and the pi ching effect. Bas d on the processed experime tal data, the hysteretic parameters that hould be adopted to model these phenome a are calibr t . The prop s d model can be dopted for nonlin ar st tic and dyn mic analys s f r he seis ic asses ment of n w and existing buildings. © 2022 The Authors. Published b ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review u der re ponsibility of scientific committe of the XIX ANIDIS C nfere ce, Seismic Engineering in Italy Keywords: experimental database; empirical equation; cyclic response; response envelope; hysteretic parameter 1. Introduction The development of response models for displacement-based assessment and nonlinear modelling of Reinforced Concr te (RC) embe s is a key issue both for pr - ormative r earch f r s ismic vu nerability/fragility XIX ANIDIS Conference, Seismic Engineering in Italy Empirical modelling of the cyclic response of reinforced concrete columns with deformed bars Mariano Di Domenico a , Paolo Ricci a *, Gerardo M. Verderame a a Department of Structures for Engineering and Architecture, University of Naples Federico II, Via Claudio 21, Naples 80125, Italy

* Corresponding author. Tel.: +39-081-7683341; fax: +39-081-7683332. E-mail address: paolo.ricci@unina.it * Corresponding author. Tel.: +39-081-7683341; fax: +39-081-7683332. E-mail address: paolo.ricci@unina.it

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. 10.1016/j.prostr.2023.01.063