Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures

Vertical deflection of a frame beam is an important indicator in the limit-state analysis of frame structures, particularly for steel–concrete composite beams, which are usually designed with large spans and heavy loads. In this study, the equivalent flexural stiffness of composite frame beams is an...

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Autores principales:	Mu-Xuan Tao, Zi-Ang Li, Qi-Liang Zhou, Li-Yan Xu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	equivalent flexural stiffness rotation constraint composite beam negative moment area deflection Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/67400e5b100f44b09655fa4d014a6418
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spelling	oai:doaj.org-article:67400e5b100f44b09655fa4d014a64182021-11-11T15:20:00ZAnalysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures10.3390/app1121103052076-3417https://doaj.org/article/67400e5b100f44b09655fa4d014a64182021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10305https://doaj.org/toc/2076-3417Vertical deflection of a frame beam is an important indicator in the limit-state analysis of frame structures, particularly for steel–concrete composite beams, which are usually designed with large spans and heavy loads. In this study, the equivalent flexural stiffness of composite frame beams is analysed to evaluate their vertical deflection. A theoretical beam model with a spring constraint boundary and varied stiffness segments is established to consider the influence of both the rotation restraint stiffness at the beam ends and the cracked section in the negative moment region, such that the inelastic bending deformation of the composite beams can be elaborately described. By an extensive parametric analysis, a fitting formula for evaluating the equivalent flexural stiffness of the composite beams, including the effects of the rotational constraint and the concrete cracking, is obtained. The validity of the proposed formula is demonstrated by comparing its calculation accuracy with those of existing design formulas for analysing the equivalent flexural stiffness of the composite beam members. Moreover, its utility is further verified by conducting non-linear finite element simulations of structural systems to examine the serviceability limit state and the entire process evolution of beam deflections under vertical loading. Finally, to facilitate the practical application of the proposed formula in engineering design, a simplified method to calculate the deflection of composite beams, which utilises the internal force distribution of elastic analysis, is presented based on the concept of equivalent flexural stiffness.Mu-Xuan TaoZi-Ang LiQi-Liang ZhouLi-Yan XuMDPI AGarticleequivalent flexural stiffnessrotation constraintcomposite beamnegative moment areadeflectionTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10305, p 10305 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	equivalent flexural stiffness rotation constraint composite beam negative moment area deflection Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	equivalent flexural stiffness rotation constraint composite beam negative moment area deflection Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Mu-Xuan Tao Zi-Ang Li Qi-Liang Zhou Li-Yan Xu Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures
description	Vertical deflection of a frame beam is an important indicator in the limit-state analysis of frame structures, particularly for steel–concrete composite beams, which are usually designed with large spans and heavy loads. In this study, the equivalent flexural stiffness of composite frame beams is analysed to evaluate their vertical deflection. A theoretical beam model with a spring constraint boundary and varied stiffness segments is established to consider the influence of both the rotation restraint stiffness at the beam ends and the cracked section in the negative moment region, such that the inelastic bending deformation of the composite beams can be elaborately described. By an extensive parametric analysis, a fitting formula for evaluating the equivalent flexural stiffness of the composite beams, including the effects of the rotational constraint and the concrete cracking, is obtained. The validity of the proposed formula is demonstrated by comparing its calculation accuracy with those of existing design formulas for analysing the equivalent flexural stiffness of the composite beam members. Moreover, its utility is further verified by conducting non-linear finite element simulations of structural systems to examine the serviceability limit state and the entire process evolution of beam deflections under vertical loading. Finally, to facilitate the practical application of the proposed formula in engineering design, a simplified method to calculate the deflection of composite beams, which utilises the internal force distribution of elastic analysis, is presented based on the concept of equivalent flexural stiffness.
format	article
author	Mu-Xuan Tao Zi-Ang Li Qi-Liang Zhou Li-Yan Xu
author_facet	Mu-Xuan Tao Zi-Ang Li Qi-Liang Zhou Li-Yan Xu
author_sort	Mu-Xuan Tao
title	Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures
title_short	Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures
title_full	Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures
title_fullStr	Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures
title_full_unstemmed	Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures
title_sort	analysis of equivalent flexural stiffness of steel–concrete composite beams in frame structures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/67400e5b100f44b09655fa4d014a6418
work_keys_str_mv	AT muxuantao analysisofequivalentflexuralstiffnessofsteelconcretecompositebeamsinframestructures AT ziangli analysisofequivalentflexuralstiffnessofsteelconcretecompositebeamsinframestructures AT qiliangzhou analysisofequivalentflexuralstiffnessofsteelconcretecompositebeamsinframestructures AT liyanxu analysisofequivalentflexuralstiffnessofsteelconcretecompositebeamsinframestructures
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Analysis of Equivalent Flexural Stiffness of Steel–Concrete Composite Beams in Frame Structures

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