UBC 97 load combination
UBC 97 load combination
(OP)
I am revising design report.
it is professional one I think, but the load combination is not similar to you ubc97 ,although he is telling that combination is form ubc 97
see attached ubc 97 load combination form report.
it is professional one I think, but the load combination is not similar to you ubc97 ,although he is telling that combination is form ubc 97
see attached ubc 97 load combination form report.






RE: UBC 97 load combination
RE: UBC 97 load combination
RE: UBC 97 load combination
For the 0.9DL, you subtract since the vertical earthquake effect can be positve or negative.
RE: UBC 97 load combination
i mentioned that earthquake portion is fine( i agree with)
but why wind load factor is different.
am i missing something?
RE: UBC 97 load combination
According to UBC combinations, the load factor for the wind is 1.3 not 1.6.
It became 1.6 in the ASCE where a directionality factor has been introduced.
RE: UBC 97 load combination
in ASCE 2005 THE Factor is 1 , but in ASCE 2010 THE Factor is 1.6(as mentioned in ACI 318-11,COMMENTARY)
But ubc is still 1.3.
any further comment on this guys
RE: UBC 97 load combination
In the IBC (and later ASCE 7 versions like 7-05) they changed to a "3 second gust" wind speed and included a separate directionality factor (per joncle10 above). This changed the wind factor to 1.6.
In the later version of ASCE 7-10, wind was revised again to be "3 second gust" but with the importance factor included in the wind speed along with the fact that ultimate values of wind speed were then used, reducing the load factor to 1.0.
So the proper wind load factor to use depends very much on the particular code you are using.
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