Abstract
The responses of flat reinforced concrete (RC) floor slabs with openings subjected to horizontal in-plane cyclic loads in addition to vertical service loads were investigated using nonlinear finite element analysis (FEA). A finite element model (FEM) was designed to perform a parametric analysis. The effects of opening sizes (7%, 14%, 25%, and 30% of the total area of the slab), opening shapes (elliptical, circular, L-shaped, T-shaped, cross, and rectangular), and location on the hysteretic behavior of the floor slab were considered. The research indicated that openings in RC floor slabs reduce the energy absorption capacity and stiffness of the floor slab. The inclusion of 30% opening on the floor slab causes a 68.5%, 47.3%, and 45.6% drop in lateral load capacity, stiffness, and lateral displacement, respectively, compared to the floor slab with no openings. The flat RC floor slab with a circular opening shape has increased efficiency. The placement of the openings is more desirable by positioning the openings at the intersection of two-column strips.
Highlights
As a primary horizontal structural element of building structures, the floor slab is susceptible to loads in and out of a plane, which are mostly attributable to lateral loads [1, 2]
An experimental and analytical investigation was carried out at Lehigh University [6] to identify in-plane seismic behavior of floor diaphragm with scaled models representing a portion of a floor system in a building structure with various loading and support conditions. e diaphragm forces were applied in the plane of the floor system, both monotonically and cyclically. e hysteresis behavior was identified after the floor slab system experienced inelastic deformation
Conclusion e nonlinear finite element analysis (FEA) was used to investigate the response of flat reinforced concrete (RC) floor slabs subjected to cyclic in-plane loading. e influence of the slabs’ aspect ratio, opening size, location, and shape was evaluated
Summary
E responses of flat reinforced concrete (RC) floor slabs with openings subjected to horizontal in-plane cyclic loads in addition to vertical service loads were investigated using nonlinear finite element analysis (FEA). E effects of opening sizes (7%, 14%, 25%, and 30% of the total area of the slab), opening shapes (elliptical, circular, L-shaped, T-shaped, cross, and rectangular), and location on the hysteretic behavior of the floor slab were considered. E research indicated that openings in RC floor slabs reduce the energy absorption capacity and stiffness of the floor slab. E inclusion of 30% opening on the floor slab causes a 68.5%, 47.3%, and 45.6% drop in lateral load capacity, stiffness, and lateral displacement, respectively, compared to the floor slab with no openings. E flat RC floor slab with a circular opening shape has increased efficiency. A finite element model (FEM) was designed to perform a parametric analysis. e effects of opening sizes (7%, 14%, 25%, and 30% of the total area of the slab), opening shapes (elliptical, circular, L-shaped, T-shaped, cross, and rectangular), and location on the hysteretic behavior of the floor slab were considered. e research indicated that openings in RC floor slabs reduce the energy absorption capacity and stiffness of the floor slab. e inclusion of 30% opening on the floor slab causes a 68.5%, 47.3%, and 45.6% drop in lateral load capacity, stiffness, and lateral displacement, respectively, compared to the floor slab with no openings. e flat RC floor slab with a circular opening shape has increased efficiency. e placement of the openings is more desirable by positioning the openings at the intersection of twocolumn strips
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