TY - GEN
T1 - Numerical Analysis of a Prestressed Non-reinforced Ultra-Thin Concrete Shell
AU - Gomes, Bárbara
AU - Cavaco, Eduardo
AU - Fernandes, Paulo
AU - Júlio, Eduardo
AU - Tavares, Maria Elizabeth
N1 - Funding Information:
This paper presents part of the research work conducted in the scope of PRESHELL project, funded by Portugal 2020 through the Regional Operational Program of Lisbon (PORLISBOA2020). The main objective of this project is to develop a novel methodology to produce concrete shells at low cost. To achieve such goal, shell structures should be (i) ultra-thin, to reduce material usage; (ii) non-reinforced; (iii) prefabricated in modules; (iv) and quickly assembled in situ with minimal use of falsework.
Funding Information:
Acknowledgements. The work presented in this paper is part of a research project (PRESHELL: POCI-01-247-FEDER-039735) funded by the Portugal 2020 through the Regional Operational Program of Lisbon (PORLISBOA2020), which aims to produce prefabricated and economical ultra-thin concrete shells.
Publisher Copyright:
© 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2023
Y1 - 2023
N2 - Concrete shells are very appealing structures. However, their use is nowadays residual due to higher construction costs, mostly related to the complex and non-reusable molds, including the falsework. This paper presents part of the research work conducted in the scope of the PRESHELL project which aims to produce concrete shells at low cost. In particular, a numerical study was conducted to investigate the effects of prestress on a non-reinforced ultra-thin concrete shell. Since the form of the shell corresponds to the anti-funicular of a membrane subjected to its self-weight, non-uniform loads tend to cause significant tensile stresses. To solve this situation, a layout of embedded strands was proposed, based on the directions of the principal stresses generated by the most critical load combination. To analyze the effects of the prestress, a numerical model of the non-reinforced concrete shell was built using the ABAQUS software. Results of the numerical analysis show that the effect of prestress, according to the proposed strands layout, can improve the load carrying capacity of the shell to non-uniform loads. Prestress can also reduce the magnitude of the tensile stresses, including their spatial extent. However, embedded cables and shell’s curvature produce undesirable and permanent tensile radial stresses. Therefore, an in the case of non-reinforced shells, the use of fiber reinforced materials is encouraged.
AB - Concrete shells are very appealing structures. However, their use is nowadays residual due to higher construction costs, mostly related to the complex and non-reusable molds, including the falsework. This paper presents part of the research work conducted in the scope of the PRESHELL project which aims to produce concrete shells at low cost. In particular, a numerical study was conducted to investigate the effects of prestress on a non-reinforced ultra-thin concrete shell. Since the form of the shell corresponds to the anti-funicular of a membrane subjected to its self-weight, non-uniform loads tend to cause significant tensile stresses. To solve this situation, a layout of embedded strands was proposed, based on the directions of the principal stresses generated by the most critical load combination. To analyze the effects of the prestress, a numerical model of the non-reinforced concrete shell was built using the ABAQUS software. Results of the numerical analysis show that the effect of prestress, according to the proposed strands layout, can improve the load carrying capacity of the shell to non-uniform loads. Prestress can also reduce the magnitude of the tensile stresses, including their spatial extent. However, embedded cables and shell’s curvature produce undesirable and permanent tensile radial stresses. Therefore, an in the case of non-reinforced shells, the use of fiber reinforced materials is encouraged.
KW - Concrete
KW - Membrane
KW - Nonlinear Analysis
KW - Prestressed Concrete
KW - Shell
UR - http://www.scopus.com/inward/record.url?scp=85164247682&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-32511-3_16
DO - 10.1007/978-3-031-32511-3_16
M3 - Conference contribution
AN - SCOPUS:85164247682
SN - 978-3-031-32510-6
T3 - Lecture Notes in Civil Engineering
SP - 141
EP - 150
BT - Building for the Future: Durable, Sustainable, Resilient
A2 - Ilki, Alper
A2 - Çavunt, Derya
A2 - Çavunt, Yavuz Selim
PB - Springer
CY - Cham
T2 - International Symposium of the International Federation for Structural Concrete, fib Symposium 2023
Y2 - 5 June 2023 through 7 June 2023
ER -