STUDY ON FLEXURAL CAPACITY OF PROFILED STEEL SHEET - POLYURETHANE SANDWICH SLABS

Widely employed in enveloped structures, the metal-faced sandwich panel boasts thermal insulation, noise abatement, lightweight, and remarkable assembly efficiency. In this paper, a new type of profiled steel sheet and polyurethane sandwich slab (PSSPSS) was proposed. Through static load tests and numerical simulations, the flexural properties of the PSSPSS were studied, and the influence of individual geometric parameters on the flexural capacity of the structure was evaluated. The results of this analysis led to the derivation of the calculation formulas for the deflection and flexural bearing capacity of the PSSPSS. These results demonstrate that the bearing capacity and failure mode of the structure, as determined by test and simulation, are in perfect agreement. The sandwich slab’s failure is mainly demonstrated by an overabundance of deflection, with the peak being 1/42 of the span, and the channel steel at the middle span being distorted and snapped. The slab deflection calculation formula’s results, when compared to the test results, demonstrate a mere 2.1% error, thus confirming its accuracy. The slab thickness, profiled steel sheet thickness, polyurethane foam density, and slab span all contribute to higher bearing capacity and improved stiffness in the structure, yet the effect of the slab span is more evident. The slab span, however, has a more profound effect on stiffness. The flexural bearing capacity formula’s applicability is indicated by the maximum error being within 10%, as demonstrated by the comparison of the formula’s results with the FEA results for the sandwich slab with varying parameters.