Web Rotational Stiffness of Continuous Steel-Concrete Composite Castellated Beams
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https://orcid.org/0000-0001-5339-059X
Rodrigo Barreto Caldas
https://orcid.org/0000-0002-0851-7632
Ricardo Hallal Fakury
https://orcid.org/0000-0002-1884-5699
Hermes Carvalho
https://orcid.org/0000-0002-4652-8068
João Victor Fragoso Dias
https://orcid.org/0000-0003-1455-1519
Abstract
Continuous composite beams may suffer a global instability know as lateral distortional buckling (LDB). The design code EN 1994-1-1:2004 provides a procedure for the verification of this ultimate limit state, in which the resistant bending moment to LDB is calculated considering the behavior of the inverted “U-frame” mechanism. An essential parameter for the determination of this moment is the rotational stiffness of the composite beam, which depends on the web stiffness. The EN 1994-1-1:2004 procedure is restricted to composite beams with solid-web steel sections without openings. This paper presents several numerical analyses of the web rotational stiffness of castellated sections such as Anglo-saxon, Litzka and Peiner typology. Finally, based on numerical results obtained, a calculation procedure for determination of this stiffness was proposed.
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