IMPROVEMENT OF ULTIMATE STRENGTH OF CONTINUOUS PROFILED STEEL SHEET DRY BOARD (PSSDB) FLOOR SLAB

Abstract
An importance of the ultimate strength of Profiled Steel Sheet Dry Board (PSSDB) structures concerns in three major material components such that the ultimate strength is characterized by fractures of those material components, which are dry board, profiled steel sheet and screws. The shear transmission develops from the top face layer of dry board to the bottom face layer of profiled steel sheet by screws. It was further characterised the failure modes in previous research studies that the early yielding and buckling of the profiled steel sheet limit the ultimate strength of the PSSDB floor slab. Thus, this study was carried out with finite element analysis by introducing a strengthening method of reinforced concrete infill to postpone such failure modes. A simplified non-linear finite element (FE) model of the PSSDB floor slab was developed, validated in terms of load-deflection responses obtained from the experimental results, and the responses were reliable throughout the analysis with failure modes. The FE model was then extended to parametric studies such that different strength of reinforced concrete material introduced as infill to the profiled steel sheet, and the ultimate strength of the PSSDB floor structure was determined. Outcomes of the studies showed that significant differences concerning on the ultimate bending strength of the PSSDB floor slab are possible to gain due to the reinforced infill concrete. Finally, the failure prediction of FE models in each category in limiting the ultimate limit strength of the PSSDB floor slab based on the sum of the strength of its aspects criteria and global behaviour of PSSDB floor slab with various types of reinforced concrete infill are explained in detail in this paper.