i am currently in charge of erecting truss for a workshop. the clear span is 45 meters. the truss , itself reached our site in parts, and we had to do some welding before hoisting them up. these ones seemed not to be straight - and in fact they were not straight - when we put them all up. but placing the purlins and other joineries, now they are having a better alignment. but my concern is will this be ok, or the truss will become crooked and cause problems.
also as far as trusses are concerned (of any longer span, say more than 20 meters) what about their life in general. do they fail, and if they do so in what manner?
here in india the temp is between around 47 to 49 deg cel during the day and when it drops low it even goes to eight or nine deg cel during winter.