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Eurocode-compliant system-level reliability analyses of trussed portal frames under climatic loads
https://orcid.org/0000-0001-9752-8343
Highlights System-level reliability studies are carried out for Warren truss portal frames. Target systems are made of cold-formed high-strength steel hollow sections. System safety factor is determined for Eurocode-compliant advanced GMNIA method. Snow and wind loads are considered for the ultimate limit state design. The factor of 1.15 is proposed based on the average target reliability index of 3.0.
Abstract Eurocode 3 provides Geometrically and Materially Nonlinear Analysis with Imperfections-method (GMNIA) in which the entire structure can be designed in system-level. In GMNIA, reliability of structural system is verified by using a system safety factor which is obtained in Eurocode 3 based on numerical or experimental capacity test results. Unfortunately, such test results are scarcely published in the literature thus complicating the determination of the factor for a design engineer. In the so-called Direct Design Method, however, system safety factors are provided in advance for the design engineer by system-level reliability studies. This study determines the Eurocode-compliant GMNIA system safety factor for Warren truss portal frames by using the approach of the Direct Design Method. Advanced numerical models are utilized to perform Monte Carlo-simulations for entire structural systems. These simulations provide statistical distributions of system resistances which are employed in the First-Order Reliability Method to derive the system safety factors. Studied structures are made of S700 cold-formed hollow sections. Various system geometries, system configurations and load combinations consisting of snow and wind loads are investigated and a suitable system safety factor is proposed for the ultimate limit state design of Warren truss portal frames. The proposed system safety factor is applied in a practical comparison in which Warren system is designed both by the conventional Eurocode 3 method and GMNIA. This comparison reveals that GMNIA has a remarkable potential to offer reduced material consumption in design compared to the conventional method.
Eurocode-compliant system-level reliability analyses of trussed portal frames under climatic loads
https://orcid.org/0000-0001-9752-8343
Highlights System-level reliability studies are carried out for Warren truss portal frames. Target systems are made of cold-formed high-strength steel hollow sections. System safety factor is determined for Eurocode-compliant advanced GMNIA method. Snow and wind loads are considered for the ultimate limit state design. The factor of 1.15 is proposed based on the average target reliability index of 3.0.
Abstract Eurocode 3 provides Geometrically and Materially Nonlinear Analysis with Imperfections-method (GMNIA) in which the entire structure can be designed in system-level. In GMNIA, reliability of structural system is verified by using a system safety factor which is obtained in Eurocode 3 based on numerical or experimental capacity test results. Unfortunately, such test results are scarcely published in the literature thus complicating the determination of the factor for a design engineer. In the so-called Direct Design Method, however, system safety factors are provided in advance for the design engineer by system-level reliability studies. This study determines the Eurocode-compliant GMNIA system safety factor for Warren truss portal frames by using the approach of the Direct Design Method. Advanced numerical models are utilized to perform Monte Carlo-simulations for entire structural systems. These simulations provide statistical distributions of system resistances which are employed in the First-Order Reliability Method to derive the system safety factors. Studied structures are made of S700 cold-formed hollow sections. Various system geometries, system configurations and load combinations consisting of snow and wind loads are investigated and a suitable system safety factor is proposed for the ultimate limit state design of Warren truss portal frames. The proposed system safety factor is applied in a practical comparison in which Warren system is designed both by the conventional Eurocode 3 method and GMNIA. This comparison reveals that GMNIA has a remarkable potential to offer reduced material consumption in design compared to the conventional method.
Eurocode-compliant system-level reliability analyses of trussed portal frames under climatic loads
https://orcid.org/0000-0001-9752-8343
Highlights System-level reliability studies are carried out for Warren truss portal frames. Target systems are made of cold-formed high-strength steel hollow sections. System safety factor is determined for Eurocode-compliant advanced GMNIA method. Snow and wind loads are considered for the ultimate limit state design. The factor of 1.15 is proposed based on the average target reliability index of 3.0.
Abstract Eurocode 3 provides Geometrically and Materially Nonlinear Analysis with Imperfections-method (GMNIA) in which the entire structure can be designed in system-level. In GMNIA, reliability of structural system is verified by using a system safety factor which is obtained in Eurocode 3 based on numerical or experimental capacity test results. Unfortunately, such test results are scarcely published in the literature thus complicating the determination of the factor for a design engineer. In the so-called Direct Design Method, however, system safety factors are provided in advance for the design engineer by system-level reliability studies. This study determines the Eurocode-compliant GMNIA system safety factor for Warren truss portal frames by using the approach of the Direct Design Method. Advanced numerical models are utilized to perform Monte Carlo-simulations for entire structural systems. These simulations provide statistical distributions of system resistances which are employed in the First-Order Reliability Method to derive the system safety factors. Studied structures are made of S700 cold-formed hollow sections. Various system geometries, system configurations and load combinations consisting of snow and wind loads are investigated and a suitable system safety factor is proposed for the ultimate limit state design of Warren truss portal frames. The proposed system safety factor is applied in a practical comparison in which Warren system is designed both by the conventional Eurocode 3 method and GMNIA. This comparison reveals that GMNIA has a remarkable potential to offer reduced material consumption in design compared to the conventional method.
Eurocode-compliant system-level reliability analyses of trussed portal frames under climatic loads
Jaamala, Lauri (author) / Hietikko-Kaukola, Henna (author) / Mela, Kristo (author) / Tulonen, Juha (author) / Hyvärinen, Anssi (author)
Structural Safety ; 108
2024-02-15
Article (Journal)
Electronic Resource
English
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