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Large Structure Analysis

Question asked by Russ Johnston on Jun 12, 2009
Latest reply on Jun 15, 2009 by Robert Stupplebeen
I have an analysis probalem that I am struggling to solve and I am hoping someone can steer me in the right direction. Here's the details:

A large structual platform 45' x 25'
Currently the top structure is made of W18 x 50 beams with a 1" plate welded to the top flange
Under the top structure is another W18 x 50 structure that will contain a lifting mechanism
The load (100,000 lbs) is applied over 6 pads on the platform top surface (indicated by the red squares in the attached images)
The lower structure is essential supported by the end beams only (indicated in blue)
Both frames have been modeled using weldments

What is the best approach to solve this analysis? I am mostly concerned with deflections (the goal is less than 1/8" deviation between all 6 load pads).