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Effective Width of Slab for Composite Beam at Joint Region
Accurate estimation of the effective width of a composite beam or joint is crucial for optimal design. Underestimation of the slab’s effective width not only leads to an understatement of joint stiffness and moment resistance but also results in an inaccurate prediction of the design moment induced by applied loads. This discrepancy can impact the beam end’s restraint stiffness, leading to an underestimation of the hogging moment in composite beams, including joints. Despite the importance of precise estimations, modern design standards provide inconsistent values for the effective width of the slab, often irrespective of the assumed design limit state. In this study, the effective width of the slab recommended by various design standards with actual effective widths obtained through experimental tests on semi-rigid joint components, comprising steel beams and composite slabs, are compared at both serviceability and ultimate limit states. The comparative study reveals that the current maximum effective width prescribed by standards such as AISC and Eurocode 4 is primarily based on the geometric width of specimens used in their formulation. Furthermore, we find that the actual effective width, particularly at the ultimate limit state, tends to be wider than the values suggested by these design standards, particularly when slab reinforcement is continuous through the joint. By highlighting these disparities, the present study underscores the importance of reevaluating and refining existing design standards to better reflect real-world conditions and improve the accuracy of composite beam and joint design.
Effective Width of Slab for Composite Beam at Joint Region
Accurate estimation of the effective width of a composite beam or joint is crucial for optimal design. Underestimation of the slab’s effective width not only leads to an understatement of joint stiffness and moment resistance but also results in an inaccurate prediction of the design moment induced by applied loads. This discrepancy can impact the beam end’s restraint stiffness, leading to an underestimation of the hogging moment in composite beams, including joints. Despite the importance of precise estimations, modern design standards provide inconsistent values for the effective width of the slab, often irrespective of the assumed design limit state. In this study, the effective width of the slab recommended by various design standards with actual effective widths obtained through experimental tests on semi-rigid joint components, comprising steel beams and composite slabs, are compared at both serviceability and ultimate limit states. The comparative study reveals that the current maximum effective width prescribed by standards such as AISC and Eurocode 4 is primarily based on the geometric width of specimens used in their formulation. Furthermore, we find that the actual effective width, particularly at the ultimate limit state, tends to be wider than the values suggested by these design standards, particularly when slab reinforcement is continuous through the joint. By highlighting these disparities, the present study underscores the importance of reevaluating and refining existing design standards to better reflect real-world conditions and improve the accuracy of composite beam and joint design.
Effective Width of Slab for Composite Beam at Joint Region
Lecture Notes in Civil Engineering
Mazzolani, Federico M. (Herausgeber:in) / Piluso, Vincenzo (Herausgeber:in) / Nastri, Elide (Herausgeber:in) / Formisano, Antonio (Herausgeber:in) / Arita, Masaki (Autor:in) / Nishida, Yuichi (Autor:in) / Liew, J. Y. Richard (Autor:in) / Okazaki, Taichiro (Autor:in)
International Conference on the Behaviour of Steel Structures in Seismic Areas ; 2024 ; Salerno, Italy
03.07.2024
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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