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ASCE 7-98 vs. 7-02 uplifts

ASCE 7-98 vs. 7-02 uplifts

ASCE 7-98 vs. 7-02 uplifts

(OP)
I do a lot of residential engineering design, and quite a few truss packages from multiple sources come across my desk on a weekly basis.  We have recently switched from ASCE 7-98 to 7-02 in our area, and it appears to me the uplift values have gone down.  In some cases, these reductions are rather significant and obvious as the contractors bring back my plans to update them for the newer code.  I then can directly compare old trusses vs. new trusses.  Standard answer from truss techs is the software was updated and that's what we get now.

Can anyone provide any additional insight?

RE: ASCE 7-98 vs. 7-02 uplifts

   When the code changed, engineers quickly scrambled to update the programming on various eng. software. At first they used 'conservative' numbers. These generated high uplifts and dead loads.
  When the software was later revised, the numbers went down. Immediately builders want to update their plans to show the new software change since the connectos will be cheaper and easier to install.
 I had to update several homes and re-submit to the county to show the drop in load values. The builders probably pressured the truss eng. software makers to bring their numbers down.

RE: ASCE 7-98 vs. 7-02 uplifts

(OP)
Sorry, I thought I had reposted when I determined answer to my original question.  One of the leading software packages (Alpine) uses an algorithm based on a different ASCE method than another leading software package (Mitek).  From what I understand, Mitek will be revising to get more accurate uplifts (closer to the Alpine values).

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