I run one model using direct analysis method, first, after I finish the model and run it, the results show it is normal. but if I modified any members, and then run again, the results totally mess up, any member displacement and stress ratio are unresonable. plese some one look at it and help me find out the reasons.
First model (results are normal) name is "GHENT GENERATING BAG HOUSE #3-01-16-2013"
Modified model (results totally wrong) name is "GHENT GENERATING BAG HOUSE #3-01-16-2013-pppp"
Staad version STAAD. PRO V8I (SELECT SERIES 3) 20.07.08.20
THANKS A LOT.
This is the first file (i can't add two files at same time)