Calculating shear lag in steel-concrete composite beams under combined compression and bending
Long and complex composite steel-concrete structures are becoming common, requiring a deep understanding of the effects induced by the simultaneous action of axial forces and bending. In fact, the axial force generated, for instance, by cable inclination in cable-supported structures can modify the...
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| Veröffentlicht in: | Engineering structures Jg. 322; S. 119101 |
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| Sprache: | Englisch |
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| ISSN: | 0141-0296 |
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| Abstract | Long and complex composite steel-concrete structures are becoming common, requiring a deep understanding of the effects induced by the simultaneous action of axial forces and bending. In fact, the axial force generated, for instance, by cable inclination in cable-supported structures can modify the stress distribution within the elements compared to bending scenarios, thereby necessitating a revision of the effective width to be utilized. Nonetheless, current design codes, including Eurocode specifications and others, lack provisions for addressing the combined effects of axial force and bending, as they are exclusively tailored for bending. This limitation can introduce design complexities, necessitating the implementation of intricate Finite Element (FE) models, which impose substantial computational loads and design efforts. The methodology proposed in this paper overcomes these challenges allowing to assess the stress distribution and resistance of composite deck at Serviceability Limit State (SLS) and Ultimate Limit States (ULS) by leveraging results obtained from standard beam models typically used by structural designers or practitioners. A comprehensive parametric analysis using nonlinear finite element models is performed to validate the developed methodology. A comparison with the Eurocode 4 formulations highlights that the proposed method provides superior accuracy in estimating peak stress in concrete slabs under combined compression and bending. Additionally, it facilitates straightforward verification at the ULS in compliance with Eurocode requirements.
•Current codes ignore shear lag on axial forces in steel-concrete composite beams.•A simplified method is proposed for combined axial and bending effects.•A comprehensive parametric analysis is performed to validate the approach.•The method evaluates effective width at Serviceability and Ultimate Limit States. |
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| AbstractList | Long and complex composite steel-concrete structures are becoming common, requiring a deep understanding of the effects induced by the simultaneous action of axial forces and bending. In fact, the axial force generated, for instance, by cable inclination in cable-supported structures can modify the stress distribution within the elements compared to bending scenarios, thereby necessitating a revision of the effective width to be utilized. Nonetheless, current design codes, including Eurocode specifications and others, lack provisions for addressing the combined effects of axial force and bending, as they are exclusively tailored for bending. This limitation can introduce design complexities, necessitating the implementation of intricate Finite Element (FE) models, which impose substantial computational loads and design efforts. The methodology proposed in this paper overcomes these challenges allowing to assess the stress distribution and resistance of composite deck at Serviceability Limit State (SLS) and Ultimate Limit States (ULS) by leveraging results obtained from standard beam models typically used by structural designers or practitioners. A comprehensive parametric analysis using nonlinear finite element models is performed to validate the developed methodology. A comparison with the Eurocode 4 formulations highlights that the proposed method provides superior accuracy in estimating peak stress in concrete slabs under combined compression and bending. Additionally, it facilitates straightforward verification at the ULS in compliance with Eurocode requirements.
•Current codes ignore shear lag on axial forces in steel-concrete composite beams.•A simplified method is proposed for combined axial and bending effects.•A comprehensive parametric analysis is performed to validate the approach.•The method evaluates effective width at Serviceability and Ultimate Limit States. |
| ArticleNumber | 119101 |
| Author | Giaccu, Gian Felice Maiorana, Emanuele Fenu, Luigi Briseghella, Bruno |
| Author_xml | – sequence: 1 givenname: Gian Felice surname: Giaccu fullname: Giaccu, Gian Felice organization: Department of Architecture, Design and Urban Planning, University of Sassari, Alghero, Italy – sequence: 2 givenname: Emanuele surname: Maiorana fullname: Maiorana, Emanuele email: e.maiorana@unirsm.sm organization: Department of Economics, Science, Engineering and Design, University of the Republic of San Marino, San Marino – sequence: 3 givenname: Luigi surname: Fenu fullname: Fenu, Luigi organization: Department of Civil and Environmental Engineering and Architecture, University of Cagliari, Cagliari, Italy – sequence: 4 givenname: Bruno surname: Briseghella fullname: Briseghella, Bruno organization: College of Civil Engineering, Fuzhou University, Fuzhou, China |
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| Cites_doi | 10.1016/j.jcsr.2010.11.009 10.1016/j.engstruct.2007.07.027 10.1007/s12205-023-1568-9 10.1016/j.jcsr.2016.04.023 10.1016/j.engstruct.2010.04.041 10.1090/qam/17176 10.1016/j.conbuildmat.2020.118303 10.1016/j.istruc.2022.03.034 10.62913/engj.v58i4.1183 10.1016/j.engstruct.2004.07.009 10.1016/S0143-974X(01)00058-X 10.1080/15376490902781217 10.1061/(ASCE)0733-9445(1992)118:7(1871) 10.1080/15732479.2023.2290701 10.12989/gae.2016.11.5.671 10.3390/jcs4040157 10.1016/j.jcsr.2006.11.018 10.1016/j.jcsr.2020.106152 10.1061/(ASCE)1084-0702(2000)5:2(91) 10.1016/j.engstruct.2023.115752 10.1016/0020-7683(74)90108-5 10.1016/j.autcon.2021.103879 |
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| Keywords | Axial force and bending Shear-lag Steel-concrete composite beam Effective width Non-linear analysis |
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| Title | Calculating shear lag in steel-concrete composite beams under combined compression and bending |
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