I am playing around with a simple beam analysis in STAAD (version 20.07.11.82) with only member dead load case (1.0 gravity load factor).I initially had it modeled as a 2-member beam fixed at a midspan joint. Then I changed it to a single member. The results were the same for each case.I am trying to analyze a built-up steel section (prismatic general). I calculated the section properties by hand and defined the section in STAAD. And I am getting an extremely large maximum deflection from STAAD. c. 2400-inchesMy hand calculations (5wL^2 / 384EI) are only c. 6-inches.When I changed the section property definition to a W-beam from the section database, STAAD's maximum deflection is spot-on to my hand calculations. c. 28-inchesIn both cases, the maximum moment and bearing reactions are as expected (verified by hand calcs). And I've tried using the " SET SHEAR " command, but that doesn't seem to have any effect.Does anyone have any ideas what's going wrong with my prismatic section deflection analysis?...thanks for any input...
0284.1548-StrongB-ONLY.std
Yeah. That was it.
I even have a note on my section properties worksheet to check the STAAD orientation, but I decided to be stupid instead.
Thanks!
Please check the sectional properties you have entered for the member. Probably the inertia & section modulus values in both axis got exchanged. If you enter beta angle 90 for that member you will be able to match the values with your hand calculation. Please check and let me know if it is the case.
Answer Verified By: just humm