07.32: The flexural strength behavior of profiled steel sheet – with hot rolled plate panel system with bolted connection

Abstract

ABSTRACTAn investigation on a new lightweight floor system using cold‐formed steel (CFS) sheet connected to the hot rolled steel (HRS) plate by bolts were carried out in the present study. A total of 18 numbers of specimens with varying lengths (short, moderate and long), bolt spacing (L/4, L/6 and L/8) and thickness (0.45mm; 0.45mm + 0.45mm) of CFS trapezoidal sheet were studied in three‐point bending to understand the moment carrying capacity and flexural behavior (deflection, stiffness and rotation) for composite panels in two phases. Phase I was based on single trapezoidal CFS sheet whereas the phase II was based on doubling the thickness by nesting (placing one sheet on top of another) two sheets together. The test results indicate that entire phase II specimens attained 50% to 80% higher ultimate load compared to phase I specimens. Moreover, significant increase in stiffness observed in all the phase I and phase II specimens with a decrease in spacing between the bolts. In general, it can observed that moderate length (1200 mm, l/d = 29.4) specimens was attained maximum moment carrying capacity compared to shorter (700 mm, l/d =14.7) and longer (1700 mm, l/d = 44.1) specimens. In addition, the mode of failure changed from local bending to tearing of CFS sheet under the maximum moment region with increase in span length.