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Re: What is 2t plastic hinge gusset plate design?

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If you can get your hands on the SEAONC seismic design manual vol III, it has an example for SCBF's.

the 2T offset is for HSS braces. For WF braces, you may be able to avoid this depending on which way your brace is rotated about it's axis.

The two papers Michelle linked for you are good references. The 2T is now actually a range of 2T to 4T where T is the thickness of the gusset plate and the yield/buckling line is offset from the edge of the brace and a projection along the gusset from the frame column to the frame beam.


On Wed, Mar 26, 2008 at 4:57 AM, Michelle Motchos <mmotchos(--nospam--at)> wrote:



This provision is to allow for inelastic rotation at the joint in accordance with AISC-341 section 13.3b and is discussed further in the commentary with the recommendation of a 2T to 3T distance

I also found the following two publications very helpful:


Michelle Motchos, PE
Stevens & Wilkinson of South Carolina, Inc.

Columbia, SC



From: G Vishwanath [mailto:gvshwnth(--nospam--at)]
Sent: Wednesday, March 26, 2008 2:20 AM
To: steel steel; seaint(--nospam--at)
Subject: What is 2t plastic hinge gusset plate design?


We are detailing  a 600 ton  commercial 7 storyed building.

Columns are braced (normal X bracing) with Tubular sections (HSS 7x7x3/8, 6x6x1/4,  5x5x1/4, 3 1/2x3 1/2x1/4 typically)

No bracing forces are shown for us to detail the connections.

We asked if we could use half the tension capacity of the HSS members.


The engiener in his response has asked us to submit our proposals with calcs and he wil then decide.

He also writes

"connection of braces needs to show 2t plastic hinge gusset plate design"


What does this mean?

We normally  detail gussets using  3/8", 1/2",  5/8" or 3/4" thick plates depending on the forces unless the thickness is specified by the engineer.


Thanks in advance for any advice or oinions






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