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Structural Capacities of Spherically Voided Biaxial Slab (SVBS)
Demand for a lighter and safer concrete floor system to improve the span limit resulted from the high weight-to-stiffness/strength ratios of a solid, reinforced concrete slab has led to the emergence of spherically voided biaxial slab (SVBS). However, the voids impart a non-prismatic nature in both in-plane directions of this new slab system. Because of this non-prismatic nature, determination of stiffness and structural capacity of a spherically voided biaxial slab is inherently challenging. The inclusion of the voids is intuitively expected to compromise the stiffness and structural capacity of the slab. However, the extent of the compromise is not explicitly known. Therefore, in this paper, the reduction of the stiffness and structural capacities of the spherically voided slab is investigated in comparison to a solid slab with equal dimensions. A 3D, non-linear. finite element analyses software - namely, ANSYS Workbench 14.0 -is used to conduct the investigation. The analyses indicated that the flexural capacities of spherically voided biaxial slabs are very close to solid slabs of equal dimension, especially when considering long span slabs. Moreover, the failure mechanisms of SVBS and solid slab system are evaluated and found to be almost similar under uniform loads. It is also concluded that the voids around the middle region of the slabs do not significantly compromise the flexural capacity and bending behavior of the slab system. However, the punching shear resistance of SVBS is determined to be considerably less than that of solid slab.
Structural Capacities of Spherically Voided Biaxial Slab (SVBS)
Demand for a lighter and safer concrete floor system to improve the span limit resulted from the high weight-to-stiffness/strength ratios of a solid, reinforced concrete slab has led to the emergence of spherically voided biaxial slab (SVBS). However, the voids impart a non-prismatic nature in both in-plane directions of this new slab system. Because of this non-prismatic nature, determination of stiffness and structural capacity of a spherically voided biaxial slab is inherently challenging. The inclusion of the voids is intuitively expected to compromise the stiffness and structural capacity of the slab. However, the extent of the compromise is not explicitly known. Therefore, in this paper, the reduction of the stiffness and structural capacities of the spherically voided slab is investigated in comparison to a solid slab with equal dimensions. A 3D, non-linear. finite element analyses software - namely, ANSYS Workbench 14.0 -is used to conduct the investigation. The analyses indicated that the flexural capacities of spherically voided biaxial slabs are very close to solid slabs of equal dimension, especially when considering long span slabs. Moreover, the failure mechanisms of SVBS and solid slab system are evaluated and found to be almost similar under uniform loads. It is also concluded that the voids around the middle region of the slabs do not significantly compromise the flexural capacity and bending behavior of the slab system. However, the punching shear resistance of SVBS is determined to be considerably less than that of solid slab.
Structural Capacities of Spherically Voided Biaxial Slab (SVBS)
Ali, Wondwosen B. (author) / Urgessa, Girum S. (author)
Structures Congress 2014 ; 2014 ; Boston, Massachusetts, United States
Structures Congress 2014 ; 785-796
2014-04-02
Conference paper
Electronic Resource
English
Structural Capacities of Spherically Voided Biaxial Slab (SVBS)
| British Library Conference Proceedings | 2014
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