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horizontal irregularity 1a 9asce7-050

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发表于 2009-9-9 17:01:20 | 显示全部楼层 |阅读模式
horizontal irregularity 1a (asce7-05)
does anyone know of an exception based on the magnitude of the story drift?  i have a two-story building with special concentric braced frames relatively symmetrical, seismic design category d.  when i calculate the torsional irregularity, i am outside of the 1.2 limit, but the seismic drifts are very small, around h/600.  
for example: assume 18 feet from the second floor to the roof.  one corner has a story drift of 0.36", the other corner drifts 0.23".  the average drift x 1.2 = 0.354".  this would be defined as torsionally irregular even though the maximum story drift is less than 3/8".  that seems ridiculous.  am i missing something?  seems like there should be an exception for when the magnitude of the story drift is very small.
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