Question

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(a) The rigid bolted connection shown in Figure 4 is used to transmit a total vertical load of 350 kN applied as shown. Two bracket plates are connected to the flanges of the I section using the bolt groups (refer figure 4) and hence, the bolts are loaded in- plane. Determine if the bolted connection shown in Figure 4 can safely support the applied load (use cl. 9.4.1 AS4100 1998). The bolts are M20 of 8.8S grade with a shear capacity of 92.6 kN per bolt. Tensile strength (fup) of the 12 mm thick plate/ply (grade 300) is 410 MPa. Assume ae 40 mm. All the dimensions are in mm, but the figure is not to scale. (110 marks) (40 marks) (b) Check whether the ply is safe in bearing. 300 40 3 100 300 100 40 12 mm thick plate 40 40 Figure 4. A bolted steel connection O

Answer 1

30ommy 35o x1oN F= 3 50x103N Nb: 16 Do 20mm Be De- 86 Pc- DOx CO.36) 17.2 mm Direct Failure Fd= F Nb 3 soXio3 Sc 21.875X10N 16 Bending Foilure e 300 l=R4-LS-8 (00 a6 he9 $1 50 T50 Tanfo-/iso So 05 496463 .565 6. q0. 00 Similorly far d 50 50 Fxe - 4 ]xC2)> s0x 10x (300)=4C460(1010 3 SOx 2X 301.035 Fb- x(li)30 1.035 x (196.4 63) 59. 143x103N OOG

Resultant Fosce FR- EdCFb)+ 2Fd)xCFb) xcos FREVC21.57510(.143x10+2 (21-8 15o) ( 59.143x10)cos 7l. se) FR= 69.2440x103 Shear coparity of perbo 14 is FP 92.6 103 Safe Hence FRa FR and Support aplied lood b Checking For Ply Bearing TCD t TYC20) X(12) 53.982mm 1 Number o f bolts て=F A. て= 3S0× 103 Tx(2の×Cn)X16)

29.01 MPA we leno co 6t0 0esile stress 2x 2XC29.01)- 58.02 MPA 410 MPA 6tgiven>6t Hence ply is Sa fe in beaing