doi:10.3850/978-981-08-9247-0_rp057-icsas11

ABSTRACT

This paper describes the study of multiple panels Profiled Steel Sheet Dry Board (PSSDB) floor system with practical length and width focussing on the effect of aspect ratio of the models, boundary conditions and presence of various grades of concrete as an infill material on the behaviour of the system under service load. For this purpose, twelve finite element models (six models of PSSDB and six models of PSSDB with concrete infill (PSSDBC)), with two different lengths (2400 mm and 3600 mm) and three different widths (1545 mm, 2295 mm, and 3045 mm) under six different boundary conditions were developed to predict their behaviour under uniform distributed load. Types of analysis considered were modal and static analyses to identify Fundamental Natural Frequency (FNF) and mid-span, mid-width deflection of panels respectively. The FNF is needed to determine under which frequency category the floor falls into, either Low Frequency Floor (LFF) or High Frequency Floor (HFF). Panels with FNF greater than 10 Hz are considered HFF, and thus selected for further static analysis to determine deflection at mid-span, mid-width of the panels, as deflection is the control criteria for the HFF, while LFF which depends on acceleration limit as the control criteria is not within the scope of this paper. Various types of boundary conditions were chosen for the four edges of the panels, either pin, roller or free supports. For end support perpendicular to the strong direction of the PSS, in general the PSS is assumed supported only at the bottom flanges (BF). However, only in one case, the PSS is assumed supported at both the bottom and top flanges (BTF). The results showed that the mid-span, mid-width (MSMW) deflection is much affected by support conditions and concrete infill. However, the model aspect ratio (number of panels) does not have any significant effect on the results. The results also uncovered that controlling sliding along the strong direction supports of the PSS has much more significant effect on the results compared to controlling sliding along weak PSS direction supports. The mid-span, mid-width deflection of the PSSDB and PSSDBC panels reduced by an average value of 55.6% and 33.45% respectively by using BTF support instead of the BF support conditions. The presence of concrete can reduce the deflection of one of the PSSDB system as an example by an average value of 58.26%. The deflection of the PSSDBC panel reduced by 4.1% by using grade 30 instead of grade 25 concrete, and 3.5% by using grade 35 instead of grade 30 concrete. Also, it was found that the effect of changing the thickness of the PSS and DB is more significant in the PSSDB than the PSSDBC system as the deflection of the PSSDB and PSSDBC system decreased by an average value of 19.9% and 6.9% respectively by changing the thickness of the DB from 9.252 mm to 25 mm and also by an average value of 17.84% and 10.59% respectively by changing thickness of the PSS from 0.8 mm to 1.0 mm.

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