Numerical Investigation on the Effect of Material Thicknesses on Membrane Action Development in PSSDB Floor System Mahmood Seraji 1 , W. H. Wan Badaruzzaman 2 and Mohd Isa Jaffar 3 1 Department of Civil Engineering, Bushehr branch, Islamic Azad University, Bushehr, Iran 2, 3 Department of Civil and structural Engineering, Universiti Kebangsaan Malaysia, Bangi, 43000, Malaysia Abstract. Profiled Steel Sheeting Dry Board (PSSDB) flooring system is lightweight composite system composed of profiled steel sheeting and dry board, the basic structural components, connected by mechanical fasteners, such as self-drilling and self-tapping screws. Review the literatures shows that avoiding the lateral translation of the floor at boundaries paves the road for development of the arching action in the floor from boundary to boundary. Benefiting from arching action enhances the rigidities and the flexural strength of the PSSDB floor. The objective of this paper is to investigate effect of changing the material thickness on the development of membrane action in the PSSDB flooring system. Verified finite element model with previously conducted experimental work was employed in this study. The achieved results showed that thickness reduction of the profiled steel sheeting made significant decrease of the floor’s load-carrying capacity in various types of boundary conditions. Unnoticeable differences were observed for the load carrying capacity of the floor when various dry board thicknesses were used that is of importance economically. Keywords: PSSDB System, Compressive Membrane Action, Arching Action, Thickness, Load Carrying Capacity. 1. Introduction Profiled Steel Sheeting Dry Board (PSSDB) system is (see Fig. 1). The empty space between profiled steel sheeting and dry board can be filled by lightweight material to increase the sound insulation and fire/heat resistance of the system. Although infill generally does not have a structural contribution to the system, concrete infill has structural and non-structural functions. Several literatures have explored the behaviour of PSSDB system [1]-[6]. Fig. 1. Typical PSSDB panel Membrane action theory consists of two phases; compressive membrane action and tensile membrane action. For instance, in simply supported one-way slab subjected to vertical loading, as the mid-span  Corresponding author. Tel.: + 989274916250. E-mail address: mseraji86@gmail.com. 2015 2nd International Conference on Geological and Civil Engineering IPCBEE vol. 80 (2015) © (2015) IACSIT Press, Singapore DOI: 10.7763/IPCBEE. 2015. V80. 1 1