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RE: Seismic bracing system

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Please refer to UBC section 2213.8.4.2  &  2213.8.5 for K bracing.

1.  My question is whether knee bracing is allowed or not allowed in 
seismic zone 3 & 4.   

2. For an existing 2 storied industrial steel structure, supporting 1 or 2 
equipments & maintenance platform, is knee bracing allowed to pass 
an existing beam due to gravity loads alone?  The beam is moment 
connected at ends.  The column is not loaded to it's full capacity 
(with knee bracing).  Can we apply section 2213.8.5 or 2213.10 in this case??

Thanks in advance.

Ravi Vasu, P.E.,

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