Steel-UHPC composite castellated beams under hogging bending: Experimental and numerical investigation
Tipo
Artigo
Data de publicação
2025
Periódico
Engineering Structures
Citações (Scopus)
0
Autores
de Oliveira V.M.
dos Santos V.B.
Rossi A.
Benedito A.V.
Krahl P.A.
Martins C.H.
de Andrade Silva F.
Cardoso D.C.T.
dos Santos V.B.
Rossi A.
Benedito A.V.
Krahl P.A.
Martins C.H.
de Andrade Silva F.
Cardoso D.C.T.
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Resumo
© 2025 Elsevier LtdContinuous steel-concrete composite beams provide bending moment redistribution, slight deflection, the capability to cover longer spans and cost-effectiveness. Employing steel alveolar I-sections and Ultra-High-Performance Concrete (UHPC) slabs in these composite beams can significantly dematerialize the structure. Differently from conventional concrete, UHPC slabs are usually thinner, but can still provide restrain and increase buckling capacity of metallic parts, although less effectively when the slab is loaded in tension. The present paper investigates the Web-Post Buckling (WPB) behavior of steel-UHPC composite castellated beams under three-point hogging bending tests for two different patterns, namely Peiner and Anglo-Saxon. The experimental results are used to validate the numerical model and assess the accuracy of the design procedures for predicting these beams' WPB resistance, and a numerical parametric study is also discussed. Both specimens reached failure by WPB coupled with the Vierendeel mechanism (VM). This way, the length of the web openings' hexagon horizontal edge (tee length) influenced the bearing capacity of the castellated beam, in which the specimen with a higher tee length had a lower ultimate load, which was also observed in the numerical parametric study. In addition, the numerical models with the shortest web-post width were more critical for the WPB occurrence. Composite castellated beams with UHPC slabs showed higher initial bending stiffness and ultimate loads than those with NC slabs, even though the WPB and VM phenomenon restricted their bearing capacity. Finally, the procedure from EN 1993–1–13 for WPB resistance prediction provided more conservative results, and the Steel Design Guide 31 overestimated the WPB resistance of castellated beams significantly affected by the VM phenomenon on their ultimate loads.
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Assuntos Scopus
'Vierendeel' mechanisms , Buckling resistance , Castellated beam , Composite castellated beam , High-performance concrete , Postbuckling , Shear capacity , Ultimate loads , Ultra high performance , Web-post buckling