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Rafter-purlin connection stiffness impact on the stress skin effect of corrugated sheet claddings
https://orcid.org/0000-0003-2360-6921
https://orcid.org/0000-0003-0568-3181
Abstract The paper analyzes the rafter-purlin connection flexibility, and its influence on the stressed skin effect of the corrugated sheet claddings. The study of these connections is important, because mainly gravity type loading experimental data are available. Stressed skin design code offers guidance for experimental results conducted on a single purlin profile (1Z), but the sample connections do not cover the nowadays most widely used details (2Z with overlaps). The preferred way for obtaining rafter-purlin connection flexibilities is experimental testing. To address the problem with a precise and relatively time efficient method, finite element models of some tested connections have been created and validated. Using the calibrated model configuration, a detailed parametric finite element analysis was conducted on the most widely used roof cladding details. Based on the results of a large set of calculations with varying geometrical parameters, using a precise bivariate quadratic interpolation, a set of 12 contour plot representations were created, that allows practicing engineers and researchers to obtain connection stiffness in a simple manner, saving a lot of time otherwise spent with testing or modeling. There is important decrease in flexibility when roof and/or wall purlins are overlapped due to the splicing. Generated results can be easily implemented in structural models of steel portal framed structures to account in the frame analysis the stiffness of the corrugated sheet cladding as stressed skin. A reliable method is presented for introducing the flexibilities of the purlin-rafter connections into a 3D portal frame structural model, considering the different connection stiffness in two loading directions. “Chameleon like” behavior of the roof cladding stiffness was observed, considering the structure-cladding interaction in the analysis. Using the improvements, weak and strong directional stiffnesses can be incorporated in the structural model and the difference between the single and overlapped purlin joints can be quantified. Also, with the provided data, the stressed skin design procedures update is possible.
Highlights Rafter-purlin connection flexibility and its influence on the stressed skin effect of the corrugated sheet claddings. Finite element models of some tested connections have been created and validated. Importance of stiffness change, simple versus overlapped purlins. “Chameleon-like” diaphragm stiffness due to dual purlin-rafter connection stiffness. Diaphragm stiffness influenced by many factors, like frame lateral stiffness, frame and building geometry, load types and their combinations.
Rafter-purlin connection stiffness impact on the stress skin effect of corrugated sheet claddings
https://orcid.org/0000-0003-2360-6921
https://orcid.org/0000-0003-0568-3181
Abstract The paper analyzes the rafter-purlin connection flexibility, and its influence on the stressed skin effect of the corrugated sheet claddings. The study of these connections is important, because mainly gravity type loading experimental data are available. Stressed skin design code offers guidance for experimental results conducted on a single purlin profile (1Z), but the sample connections do not cover the nowadays most widely used details (2Z with overlaps). The preferred way for obtaining rafter-purlin connection flexibilities is experimental testing. To address the problem with a precise and relatively time efficient method, finite element models of some tested connections have been created and validated. Using the calibrated model configuration, a detailed parametric finite element analysis was conducted on the most widely used roof cladding details. Based on the results of a large set of calculations with varying geometrical parameters, using a precise bivariate quadratic interpolation, a set of 12 contour plot representations were created, that allows practicing engineers and researchers to obtain connection stiffness in a simple manner, saving a lot of time otherwise spent with testing or modeling. There is important decrease in flexibility when roof and/or wall purlins are overlapped due to the splicing. Generated results can be easily implemented in structural models of steel portal framed structures to account in the frame analysis the stiffness of the corrugated sheet cladding as stressed skin. A reliable method is presented for introducing the flexibilities of the purlin-rafter connections into a 3D portal frame structural model, considering the different connection stiffness in two loading directions. “Chameleon like” behavior of the roof cladding stiffness was observed, considering the structure-cladding interaction in the analysis. Using the improvements, weak and strong directional stiffnesses can be incorporated in the structural model and the difference between the single and overlapped purlin joints can be quantified. Also, with the provided data, the stressed skin design procedures update is possible.
Highlights Rafter-purlin connection flexibility and its influence on the stressed skin effect of the corrugated sheet claddings. Finite element models of some tested connections have been created and validated. Importance of stiffness change, simple versus overlapped purlins. “Chameleon-like” diaphragm stiffness due to dual purlin-rafter connection stiffness. Diaphragm stiffness influenced by many factors, like frame lateral stiffness, frame and building geometry, load types and their combinations.
Rafter-purlin connection stiffness impact on the stress skin effect of corrugated sheet claddings
https://orcid.org/0000-0003-2360-6921
https://orcid.org/0000-0003-0568-3181
Abstract The paper analyzes the rafter-purlin connection flexibility, and its influence on the stressed skin effect of the corrugated sheet claddings. The study of these connections is important, because mainly gravity type loading experimental data are available. Stressed skin design code offers guidance for experimental results conducted on a single purlin profile (1Z), but the sample connections do not cover the nowadays most widely used details (2Z with overlaps). The preferred way for obtaining rafter-purlin connection flexibilities is experimental testing. To address the problem with a precise and relatively time efficient method, finite element models of some tested connections have been created and validated. Using the calibrated model configuration, a detailed parametric finite element analysis was conducted on the most widely used roof cladding details. Based on the results of a large set of calculations with varying geometrical parameters, using a precise bivariate quadratic interpolation, a set of 12 contour plot representations were created, that allows practicing engineers and researchers to obtain connection stiffness in a simple manner, saving a lot of time otherwise spent with testing or modeling. There is important decrease in flexibility when roof and/or wall purlins are overlapped due to the splicing. Generated results can be easily implemented in structural models of steel portal framed structures to account in the frame analysis the stiffness of the corrugated sheet cladding as stressed skin. A reliable method is presented for introducing the flexibilities of the purlin-rafter connections into a 3D portal frame structural model, considering the different connection stiffness in two loading directions. “Chameleon like” behavior of the roof cladding stiffness was observed, considering the structure-cladding interaction in the analysis. Using the improvements, weak and strong directional stiffnesses can be incorporated in the structural model and the difference between the single and overlapped purlin joints can be quantified. Also, with the provided data, the stressed skin design procedures update is possible.
Highlights Rafter-purlin connection flexibility and its influence on the stressed skin effect of the corrugated sheet claddings. Finite element models of some tested connections have been created and validated. Importance of stiffness change, simple versus overlapped purlins. “Chameleon-like” diaphragm stiffness due to dual purlin-rafter connection stiffness. Diaphragm stiffness influenced by many factors, like frame lateral stiffness, frame and building geometry, load types and their combinations.
Rafter-purlin connection stiffness impact on the stress skin effect of corrugated sheet claddings
Nagy, Zsolt (author) / Bács, Béla (author) / Kelemen, Andrea (author) / Sánduly, Annabella (author) / Nagy, Örs (author) / Lőrincz, Barnabás (author)
Thin-Walled Structures ; 185
2023-02-04
Article (Journal)
Electronic Resource
English
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