[TowerTalk] torque tightening querry

[Naveed at Hotmail]

What should be torque tightening for the bolts 0f 20mm and 16mm ASTM A36 , ISO GRADE 5.8 bolts , of a lattice structure which is 60m high and has to resist a wind speed of 150kph , lying in seismic zone IV , dead load in addition to self weight is the feeder cables and ladder  wieghing 0.22kn/m , 8 antenas weighing 23kg each, 4 microwaves wieghing 12kg each, having maximum allowable twist and tilt to be +-0.45 deg.Can you please tell me the source atleast.  ?



Regards
NAVEED IRSHAD