Title: Two-Way Flexural Behavior of Donut-Type Voided Slabs

Author(s): Joo-Hong Chung, Hyung-Suk Jung, Baek-il Bae, Chang-Sik Choi, and Hyun-Ki Choi

Publication: IJCSM

Volume: 12

Issue:

Appears on pages(s):

Keywords: voided slab, two-way flexural behavior, experimental investigation and load distribution.

DOI: 10.1186/s40069-018-0247-6

Date: 3/30/2018

Abstract:
Voided slab systems were developed using segmented void formers such as spherical or oval plastic balls for two-way slab applications. This type of slab is expected to behave like a general two-way reinforced concrete slab because it has segmented voids, rather than the continuous voids of hollow core slabs. However, the structural behaviors of two-way voided slabs with segmented voids have not been clearly verified. Therefore, this paper analyzes the possibility of applying a donut-type two-way voided slab, which was investigated with a 12-point two-way bending test focused on global behaviors, including its load bearing capacity, flexural stiffness, ductility, deflection, and load distribution. In addition, the design method of a donut-type two-way voided slab was reviewed through the yield line method. The test results showed that one donut-type two-way voided slab acted like a conventional two-way reinforced concrete slab with the load distributed evenly between the different directions; however, another donut-type two-way voided slab with different characteristics showed uneven load distribution with different crack patterns. In addition, the yield line method could predict the load bearing capacities of the donut-type voided slabs with approximately 95% accuracy.