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RE: Equal Tension/Comprression Capacity Device

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Nels & Jason,

The BRBF is one of the most interesting developments to come along in years. Nippon did the development, and it looked good on paper. But the costs were high and you had to do business with Nippon only. Then SME steel figured out a way to manufacture the BRBF without stepping on patent infringement. SME steel then spawned both Star Seismic and Core Brace (both located in Utah). Core Brace is still umbillically tied to SME, but Star Seismic is more of an independent entity.

The beauty of the product is that it gets me back to the smaller gusset plates with no yield line stuff. It relieves the various nagging problems of Special Concentric Braced Frames, and Ordinary Concentric Braced Frames. I would give it the official "sliced bread" analogy.

Harold Sprague

From: "Jason Emoto" <jemoto(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: RE: Equal Tension/Comprression Capacity Device
Date: Thu, 16 Dec 2004 11:30:22 -0800

Buckling-restrained brace manufacturers include Star Seismic (, Core Brace (, and Nippon Steel. There is also a new Steel Tips article by Lopez and Sabelli that provides a good introduction to BRBs ( BRBFs are included in the latest NEHRP provisions and will be included in the 2005 AISC seismic provisions.

Jason Emoto

>>> "Garner, Robert" <rgarner(--nospam--at)> 12/16/04 10:31AM >>>

A B.R.B.? (Buckling restrained brace?)

-----Original Message-----
From: Nels Roselund [mailto:njineer(--nospam--at)]
Sent: Thursday, December 16, 2004 10:39 AM
To: seaint(--nospam--at)
Subject: Equal Tension/Comprression Capacity Device

What is the structural device called that resists axial loads, both tension
and compression, and has similar stiffness and ductile capacity in either
tension or compression?  The tension is resisted by a steel rod; the
compression is resisted by the same steel rod, but compression buckling
element is prevented by continuous confinement of the rod within a sleeve.
The picture that I have in my mind [which may or may not be accurate] is of
the rod being installed in the center an un-bonded concrete-fill in a pipe;
the buckling capacity of the pipe is greater that the yield strength of the
rod so that the rod is forced to yield in compression at about the same
stress as it yields in tension.  Are there manufacturers of such a device?
Is there literature on its performance.

Nels Roselund, SE
South San Gabriel, CA

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