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RE: How to eliminate tension springs in SAP2000

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May be the problem is with the dimension. If it was a simple block with an eccentric load and designing manually, and too little of the base was in compression, then would change the size of the block.


As far as I understand software with tension-only and compression-only elements calculates tension and compression in the elements irrespective of the type. It just, sets the values to zero and keeps iterating if the value is opposite to the type. If the software has good error trapping, it will advise no solution can be found, otherwise it will simply fail to converge on a solution and reach its iteration time-out limits, and leave the solution matrix with a not so valid solution.


Since cannot have tension (unless providing some form of anchor/hold-down)  then has Daryl suggested need to remove those  springs. If that is a lot of springs then maybe the design footprint attempting to assess has a problem.




Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia