with an exception that they could be as high as 240 feet as long as any
braced frame grid did not carry more than 60% of the seismic forces in that
direction and that not more the 20% of the force in a braced frame was from
torsion.
ASCE7-05 section 12.2.5.4's wording seems to muddy the waters for me. It
says height limits in Table 12.2-1 are permitted to be increased from 160
feet to 240 ft in seismic design category D?
Does this mean I can can have an ordinary braced frame in seismic design
category D with a 35 ft height limitation increased to between 160 feet and
240 feet per ASCE 7-05?
Special braced frames and eccentrically braced frames have a height limit of
160 feet in seismic design category D. It seems like the intent of ASCE 7-05
is only to allow special braced frames and eccentrically braced frames to use
the height limit exception because of the wording "increased from 160 feet to
240 feet."
Thanks.
Scott
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