Macroscopic Elastic Constitutive Relationship of Cast-in-Place Hollow-Core Slabs
Publication: Journal of Structural Engineering
Volume 135, Issue 9
Abstract
The macroscopic Poisson ratio and elastic moduli of the cast-in-place hollow-core slab are researched in this paper. At first, the formulas for computing the Poisson’s ratio of cast-in-place hollowed slabs with bilateral ribs are deduced by theoretical means. Then, based on the characteristics of stress distribution, an effective sectional area method is proposed for computing both the bending and axial compressive elastic moduli of cylindrical hollow-core slabs at the transverse section, in which the boundary of the effective area is suggested to be at a radial distance with its vertical slope angle . Relevant formulas for computational purposes are also proposed. At last, the shear modulus of cylindrical hollow-core slab at the transverse section is proposed to be computed considering the bending-shear deformation of the varying rib and face sheets at a periodic segment, and relevant formulas for curved sides beam are also deduced. In the course of the study, the so-called transverse-rib-effect phenomenon in which the transverse rib of hollow-core slab may lead to macroscopic stiffness increase has been revealed, which is modeled by an appropriate mathematical relationship. The proposed methods and formulas are carefully evaluated analytically and numerically and may be the foundations for structural analysis of cast-in-place hollow-core slabs.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 9 • September 2009
Pages: 1040 - 1047
Copyright
© 2009 ASCE.
History
Received: Jul 25, 2006
Accepted: May 11, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
Notes
Note. Associate Editor: Dat Duthinh
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