Question

An office floor in a multi-storey building has the following makeup: 185 mm reinforced concrete slab 40 mm sand/cement screed Vinyl tiles flooring Acoustic tile suspended ceiling Vinyl tiles Sand / cement screed 185 49 Reinforced concrete slab Acoustic Ceiling tiles a. Using the data sheet, whatis the deadload (G) of the floor in kPa (give your answer to three (3) significant figures)? b. If the floor is designed for a uniformly distributed load (Q) of 4.OkPa, and the average weight of a person is assumed to be 80kg, calculate how many people this represents standing on one square metre of floor (take g= 9.81 m/s2)? Give your answer to the nearest whole person! Effective Length of struts in compression Data Sheet Both ends pinned: LL Both ends fixed: Le = 0.7L One end fixed, one end pinned: Le = 0.85L One end fixed, one end free: Le = 2L Unit weights of various sheet materials (kPa) Euler critical buckling load: π2ΕΙ Pcrit = (kPa) Acoustic ceiling tiles 0.1 Plaster (per face of wall) 0.21 Plasterboard and skim 0.15 Rafters, battens and felt 0.25 Sand/cement screed (25mm) 0.6 Slates 0.6 Steel roof sheeting 0.15 Timber floorboards 0.15 Vinyl tiles 0.05 Strength of fillet welds Unit weights of various building materials (kN/m?) kN/m Aluminium24 Brickwork 22 Reinforced Concrete Slab 25 Steel 77 Timber 6 Leg length (mm) 4 5 6 8 10 12 15 Strength (kN/mm) 0.65 0.82 0.98 1.31 1.63 1.96 2.45

Answer 1

0 solt a) Given data Thickness of slab=185mm Thickness of Vinyl biles how on www581 cement send Icement sereed Reinforced concrete slab K Acoustic Ceiling tiles screed = 40mm Assume density of screed conerete =246N (m3 Calculation bead load! j) Dead weight of im wiedlte Ree slab swid Hix thickney identity of concrete = (x0.185x25=4-625 kN/m2 20.10 kalm2 2 1) Dead weight of im width screed cement z1x0.940 x 24 = 0.9601eN/m2 vinyl 15:) Dead weight ad^tiles - B950 0.050 tnima iv) Dead wt of Acoustic tiles v) Dead wt. od plaster (per face of wall) = 0.21 ONLA vil Dead wt. of plaster board and skim 20.15 kN/m2 vii) Dead out of rafter and felt 20.25 ICN/m2 vii) bead wt of slater 20-600W/m2 ix) Dead wt. of steel rood sheeting *) bead wt. of timber floor boards = 0.15 Raam? Total dead weight 27.245eNla 2015 aalm2

Theis we can say, Total Dead load (4) of the floor 27-246 kN (m2 27.246 lepa Any) b) floor is designed for UOL load of udpa auca/m2 aux N/m2 1000 =4000 N/m2 = 4000 kg/m2 9.81 =407.747 kg/m2 Average weight of one person 280 No. of persons ean stand in one sq. meter of 407-747 floora 80 =5.095 They we can say, can stand in Isq.m of floors (14) No of person