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horizontal brace as lateral force resisting system

horizontal brace as lateral force resisting system

(OP)
I have a very minor platform, just 4' high. All beam to col and support are pinned, all are angle members.
I added horizontal brace.
I believe this will work but when I run the analysis, it's unstable (huge column drift) basically the horizontal brace is not acting as part of lateral force resisting system.

I'm curious about using horizontal brace as part of lateral force resisting system.

Of course this will work if I assume moment connection for the beam to col or use vertical brace so that is not my question.




RE: horizontal brace as lateral force resisting system

Your black box is correct. The frame is unstable, by inspection.

RE: horizontal brace as lateral force resisting system

Should add braces in the plane of the columns, kickers between the columns and beams that should help.
hokie66 is correct it is unstable as currently configured.

RE: horizontal brace as lateral force resisting system

Horizontal braces only replace a lack of diaphragm.

A nominal moment connection between you beams and columns would likely suffice at only 4 ft tall.

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