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http://dx.doi.org/10.5659/JAIK.2021.37.2.173

Load Distribution of Sub-beam considering Slab Stiffness and Boundary Conditions  

Kim, Yun Gon (Department of Architectural Engineering, Daegu University)
Publication Information
Journal of the Architectural Institute of Korea / v.37, no.2, 2021 , pp. 173-180 More about this Journal
Abstract
A new floor load distribution method for slabs with sub-beam was proposed, taking into account slab stiffness. In the current 45 degree-based load distribution method, the load distribution ratio of sub-beam and girder (RB:RG) is the same (50:50). However, when considering the composite action with slab and boundary conditions, the ratio of sub-beam would be smaller than that of girder. In this study, floor load distribution ratio according to the relative stiffness of slab and sub-beam and boundary conditions was evaluated by finite element analysis including slabs. The load distribution of the slab was greater when increasing the relative stiffness of slab and sub-beam, and that of sub-beam decreased as greater as that of the slab. For conservative design approach, the reduced portion from the sub-beam due to would add the load distribution of girder rather than subtraction from total floor load. In practical modules- span length, beam geometry, etc., the ratio (RB:RG) can be adjusted up to 40:60 by reducing the stiffness of sub-beam obtained by performance based design.
Keywords
sub-beam; load distribution; one-way slab; slab stiffness; boundary condition;
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