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Structural System to resist lateral forces in UBC97

Structural System to resist lateral forces in UBC97

Structural System to resist lateral forces in UBC97

(OP)
Hello

I read a lot but still not full understand

The bearing system is basically shear walls with slabs without beams
building frame system (I cant tell (some time shear walls some times frames,some times bracing
Moment resisting system

The table is like hill to me (shear walls every where,so why R is different,I cant find reference to clear the clouds in my head,although i read this table 100 times)

So please guide me

RE: Structural System to resist lateral forces in UBC97

The bearing wall category represents situations where the shear walls support significant axial loads as a result of their being major gravity load resisting elements.

The building frame category represents situations where the shear walls support small axial loads as a result of most of the gravity loads being resisted by a network of beams and columns that are designed to resist gravity loads.

The reasoning for using higher R values for frame systems seems to be based on traditional practice rather than research or technical principles. That being said, frame systems would seem desirable owing to the fact that:

1) seismic damage would be less likely to adversely affect gravity load carrying capacity in a frame system and;

2) like any column, a shear wall will respond with greater ductility when axial loads in the wall are low.

Note that frame members can be constructed integrally with shear walls while still maintaining the building frame system classification.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Structural System to resist lateral forces in UBC97

(OP)
Now it make sense.

Thank you

RE: Structural System to resist lateral forces in UBC97

to tell you the truth the classification is absolutely confusing, as the whole seismic provisions of the ASCE. I don't understand why they're not simplified, specially the R factors. I much prefer the mexican code where they just give you 3 values for R depending on whether you're using Masonry, concrete or steel and they enforce you to confine all masonry so then it's really conservative, then again, construction and labor costs are ridiculously cheap in comparison to the U.S.

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