Bearing Resistance and Failure Mode of Bolted-layered Cemboard Panels

Abstract

The fabrication of precast slab can be made from wide range of material either neat concrete, foamed concrete or even composite. Until recently, a new interest has been discovered. Instead of wet concrete mixing process in plant, the precast slab can be substituted with fibre cement board or commonly referred as cemboard that meets the specific load requirements with minimum thickness. However, cemboard panel is preferable for lightweight floor system due to its physical strength limitation. Its thickness that relatively small around 15 mm to 25 mm contribute to the drawback and subsequently prohibited the application of cemboard panel as heavyweight floor system. Small specimens are prepared to determine the optimum orientation of bolts and type of bond by analysing the bearing resistance and bond-slip behaviour. It was found that the bearing capacity is governed by polyurethane glue. Meanwhile, the bond-slip behaviour is effectively controlled by the steel bolt. If the steel bolt is solely used as bond mechanism, the bearing capacity will rely on its quantity and capacity and increasing the quantity of steel bolt will eventually lead to the higher value of bearing resistance.

Force and Slip Displacement of Fibre Cemboard Panels Subjected To Four-Point Bending Test

“…It was found from the experimental testing that different bond mechanisms yield different values of bearing resistance. This observation is identical to that obtained by Norhalim & Jaini [23] for the fibre cemboard samples subjected to push-out test. Bond mechanism manifests the condition of contact surface and friction between the structure.…”

“…The use of fibre cemboard as a bearing structural component is quite limited. According to Norhalim & Jaini [23], fibre cemboard can be used together with cold-formed steel joints or girders as lightweight floor system.…”

“…The continuous steel mesh connector has better flexural rigidity and beam stability than discrete connectors but less elasticity. Norhalim & Jaini [23] investigated the bearing resistance and failure mode of bolted-layered cemboard panel. The specimen that conducted consist of two layered fibre cement board that bond by a steel bolts and polyurethane glue.…”

“…An investigation on bearing capacity and mode failure of the layered-cemboard by using polyurethane glue with various number of bolts was done by Norhalim & Jaini [23]. Steel bolt samples, on the other hand, can effectively protect the fibre cement board from splitting.…”