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Re: Unbonded braces

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Thanks for your comments.
Were the systems you used patented in the Japan or the US?  Or did you "re-create" the systems used.

Thor A Tandy  P.Eng, MIPENZ
Victoria BC
e-mail: vicpeng(--nospam--at)
----- Original Message -----
Sent: Monday, October 21, 2002 7:37 AM
Subject: Re: Unbonded braces


General comments on BRBF design:
     - It is a good idea to require coupon testing of steel from the same
piece of steel that the core is cut from.
     - Don't forget to consider the maximum axial deformation that the
brace can withstand.  The core of an unbonded brace can only undergo so
much           axial deformation before the internal parts of the brace
contact and load is carried through the grout and HSS.
     - Unbalanced load calculations (for V or chevron frames) will still be
required because the compression capacity can be larger than the tension
     capacity.  (This is due to the friction between the core and the

Sorry, but I don't have any useful literature...

Mark J. Redlinger