PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 37 (2022) 89–96

ICSI 2021 The 4th International Conference on Structural Integrity Analysis and construction of transfer structures: a case study ICSI 2021 The 4th International Conference on Structural Integrity Analysis and construction of transfer structures: a case study

Gonçalo Ribeiro a,* , João Almeida b , Paulo Lobo b,c a Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal *E-mail address: goncalo.x.ribeiro@gmail.com b Department of Civil Engineering, Architecture and Georesources, CERIS, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal c Faculty of Exact Sciences and Engineering, University of Madeira, Campus Universitário da Penteada, 9000-390 Funchal, Madeira, Portugal Gonçalo Ribeiro a,* , João Almeida b , Paulo Lobo b,c a Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico, University of Lisbon, v. Rovisco Pais, 1049-001 Lisbon, Portugal *E-mail address: goncalo.x.ribeiro@gmail.com b Department of Civil Engineering, Architecture and Georesources, CERIS, Instituto Sup rior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal c Faculty of Exact Sciences and E gineering, University of Madeira, Campus Universitário da Pentea a, 9000-390 Funchal, Madeira, Po tugal

© 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 Pedro Miguel Guimaraes Pires Moreira Abstract A transfer structure of a building is a structure that alters the load path of the gravity loads, shifting the line of thrust laterally to a different vertical alignment. They usually represent major elements of a structure and their impact on building cost and construction time can be substantial. The design for deflection control is frequently the primary consideration when defining the geometry of a transfer element, given their usual long spans and the high magnitude of the forces involved. Considerations of robustness and disproportionate collapse may also be key for the design of transfer structures as these are often regarded as critical elements for the overall stability of the building. Furthermore, the sequence of construction should be modelled through a construction-staged analysis, as it greatly affects deflections as well as final forces distribution. This paper provides guidance and highlights the key aspects that are likely to determine the structural design of transfer structures, as well as typical construction methods and challenges. It also presents a comparative study between two different types of transfer structures for the same building: an alternative composite scheme for the post-tensioned concrete transfer grid of the St. Gabriel Tower (Lisbon) was designed and the most relevant factors are highlighted. © 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 Pedro Miguel Guimaraes Pires Moreira Keywords: Type your keywords here, separated by semicolons ; 1. Introduction Functional, aesthetic, or planning needs predicate changes and discontinuities in the vertical load-bearing system of a building. These demands are often outside the boundaries of normal commercial development and create special and interesting engineering problems that are usually solved with some form of transfer structure. Abstract A transfer structure of a building is a structure that alters the load path of the gravity loads, shifting the line of thrust laterally to a different vertical alignment. They usually rep sen major el ments of a structure and their impac on building cost and construc i n tim can b subst ntial. The design for deflection contr l is frequently the primary cons deration when defining he ge met y of a ransfer el ment, given their u ual l ng spans a d the high magnitude of the forces involved. Consideratio s of robustness and disproportionate collapse may also be key for the design of transfer structures as these are often regar d as critical elem nts for the overall st bility of the building. Furthermore, th sequence o construction should be m d lled th ough a construction-s aged analysis, as it greatly aff cts deflections as well as final forces distribution. This paper provi s guidance and highlights the k y spects that are likely to det rmine the tructural design of transfer structures, s well as typical construction me hods and challenges. It also presents a comparative study betwee two differen types of transfer structures f r the same building: an alternative composite scheme for the post-tensioned concrete trans er grid of the St. G bri l Tower (Lisbon) wa designe a d the most relevant factors are highligh ed. © 2022 The Auth . Publ s ed 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 Pedro Miguel Guimara s Pires Moreira K ywords: Type your keywords here, separated by semicolons ; 1. Introduction Functional, aesthetic, or planning needs predicate changes and discontinuities in the vertical load-bearing system of a buildi g. These demands re ofte outsid the boundari s of normal comm rcial d lopment nd create pecial and interesting engine ring problems that are usually solved with s me form of t ansfer structur .

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 Pedro Miguel Guimaraes Pires Moreira 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 u der responsibility of Pedro Miguel Guimara s Pires Moreira

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.063