Deflection check on Pitched Roof & flat roof

The reason you are getting the deflection failures for the pitched portal is that, STAAD.Pro is connecting the nodes DJ1 and DJ2 by a straight line and calculating the deflections of the pitched member with respect to that line. You should not check deflections for a set of members unless ALL the analytical segments are in a single straight line. For example let us consider the members 371,386,24,395. The DJ1 is specified as 23 and DJ2 as 26. This would not work because members 371 and 386 are in one line but members 24 and 395 form a separate line which is at an inclination to the first line.

For these type of cases, I would suggest that you check the deflection manually. For example check the nodal displacement at the node 24 and compare that to your allowable value (of 22000/250=88mm).  

The reason you are getting the deflection failures for the pitched portal is that, STAAD.Pro is connecting the nodes DJ1 and DJ2 by a straight line and calculating the deflections of the pitched member with respect to that line. You should not check deflections for a set of members unless ALL the analytical segments are in a single straight line. For example let us consider the members 371,386,24,395. The DJ1 is specified as 23 and DJ2 as 26. This would not work because members 371 and 386 are in one line but members 24 and 395 form a separate line which is at an inclination to the first line.

For these type of cases, I would suggest that you check the deflection manually. For example check the nodal displacement at the node 24 and compare that to your allowable value (of 22000/250=88mm).  

Thanks

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