FLEXURAL CAPACITIES OF TWO-WAY HOLLOW SLAB WITH DONUT TYPE VOID

This paper presents the flexural capacities of biaxial hollow slab with donut type void. Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A biaxial hollow slab system is widely known as one of the effective slab systems which can reduce self-weight of slab. A biaxial hollow slab has a two-dimensional arrangement of void within the slabs to reduce self-weight. The behaviours of biaxial hollow slab are influenced by the shape of void and cage. To verify the flexural behaviours of this biaxial hollow slab such as crack pattern and force flow, two-dimensional flexural tests were performed by using special loading frame. Three test specimens were used for test parameters. One was conventional RC slab and two were hollow slabs which one had merged type cage and the other had no cage. The test parameters also included two different materials of plastic balls which one was general plastic and the other was glass fibre plastic. And these had same shape of void, donut form. The test results showed that the crack pattern and behaviour were different by the cage type.