Hi there,
I have few queries regarding bracing design in attached STAAD models; which is basically a structural steel frame supporting supporting PV panels.
1. In file named "Model_Tension only assign" the cross bracings are assigned as 'tension only' so that Rod (cable) bracing can be used. However, these members are failing as small magnitude of compression is induced in these members in load combinations including temperature and seismic loads. Is there any way to avoid transfer of compression loads in bracing members assign with 'tension only' command?
2. Continuation to point no.1 above, the elements are found safe if he bracing members areassigned as channel/angle type instead of rod. However, how practical is it to use channel or angles as 'tension only' members? Can we achieve this behaviour using slotted hole connections for the bracing members?
3. Alternately, refer to attached file names "Model_partial end release", wherein bracing members are assigned with partial end release (MP= 0.995) so that they act to carry only axial loads. However, this results in transfer of very high magnitude of compression loads in bracing members due to temperature stresses; which in turn results in higher size of bracing members; which seems bit odd for such small size structure. Please advise on this.
I prefer to use rod (cable) bracing for this structure but, its possible only if I find answer to point no. 1 above.
Appreciate your help. Thanks in advance,
Cheers!
Swapnil
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