Strength of Composite Beams under Seismic Loading

by Ben Kato, Univ of Tokyo, Tokyo, Japan,
Yasuhisa Tagawa, Univ of Tokyo, Tokyo, Japan,

Abstract: Effective width of a concrete slab of a composite beam is specified in various specifications, but their theoretical backgrounds are obscure. Originally, they must have been specified for the evaluation of elastic stiffness of composite beams, and it is uncertain whether they can also be applied to the evaluation of moment capacity of composite beams. When a steel moment frame with composite beams is subjected to horizontal loading, the compressive stress in a concrete slab at the positive bending side (slab in compression) of a composite beam should be balanced mostly by the bearing stress reacting at a column face. Ultimate bending moment and the effective width of a concrete slab will be determined by the ultimate bearing strength of the concrete at the column face.

Subject Headings: Composite beams | Composite columns | Concrete columns | Seismic loads | Concrete slabs | Moment (mechanics) | Seismic tests

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