Dynamic Serviceability of Lightweight Composite Deck as Floor System Under Human Excitation

Abstract

Lightweight composite deck is widely used as floor system due to the advantage of minimum weight as well as to speedy the construction process. There are numerous investigations on the structural behaviour of lightweight composite deck, but its reliability and understanding on dynamic serviceability remain ambiguous. Therefore, this study intents to numerically investigate the dynamic serviceability of lightweight composite deck as floor system. The lightweight composite deck with dimension of 2900 mm span and 900 mm was modelled in STAAD.Pro. The thickness of lightweight composite deck varied from 100 mm to 225 mm. The isotropic equivalent plate model and effective homogenous criterion were adopted for the geometry and material properties. Dynamic serviceability in term of natural frequency and displacement were analysed in corresponds to the thickness of lightweight composite deck. It is noticeable that by increasing the thickness led to the improvement in the natural frequency. In contrast, the displacement become smaller as the thickness become larger. It was identified that only the lightweight composite deck with thickness 200 mm and 225 mm comply the allowable limit.

Natural Frequency of Lightweight Composite Slabs Based on Experimental Study and Numerical Modelling

“…Therefore, a special technique called the simplified equivalent plate model proposed by El-Dardiry & Ji [30] was employed in numerical modelling. Norhalim et al [18] proved that the simplified equivalent plate model is suitable for determining the vibration behaviour of composite slabs. The orthotopic manner of foamed concrete and steel deck in the simplified equivalent plate model is converted to an isotropic system.…”

“…Despite that, a damping ratio of 5% is always taken into account in practical seismic design [17]. A comprehensive evaluation of the vibration behaviour of lightweight composite slabs under human excitation was performed by Nurhalim et al [18]. The dimension of lightweight composite slabs is 900 mm in width, 2900 mm in span and various thicknesses from 100 mm to 225 mm.…”