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What type of seismic system is this?

What type of seismic system is this?

RE: What type of seismic system is this?

Depending on what the vertical member is and the connection at the ridge, which I cannot read, it could be a either three hinged arch or a rigid frame.  It is does not appear to be a  cantilever column from what i can see.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: What type of seismic system is this?

(OP)
The vertical member is a W shape. The connection at the ridge is (4) A325 3/4" bolts.  What item would I use from Table 12.2-1 in ASCE/SEI7?

RE: What type of seismic system is this?

Possibly any of the first four under "C. Moment Resisting Frame Systems".

You will have to check the detaining to see if it is compliant with 1 or 2.  More than likely it is 3 or 4.

Have you tried calling and asking the designing company listed on the sheet you posted?

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: What type of seismic system is this?

How about H. Steel System Not Specifically Detailed for Seismic . . .

RE: What type of seismic system is this?

Agree with Wannabe: I would use 'Steel system not specifically detailed for Seismic' if you are allowed per ASCE7.

Agree with Msquared:  call the company and ask.

Not sure what your scope is, but I would analyze this carefully.  It appears it is a three-hinged arch (based on the fact it is shallower at midspan).  In this case, there is thrust involved at the tops of the vertical members.  This thrust creates a moment at base of vertical members.  The base plate doesn't look like a 'fixed base' condition and I would question if the vertical member, base and foundation were designed properly.     

RE: What type of seismic system is this?

The column base detail indicates "Anchor Bolts by Others" and "Foundation by Others", so that connection would have to be assumed to be a hinge.

The haunch and peak detail indicate moment connections, so I think it is a two hinged arch.  In elevation, Perka calls it "M5400 Frame".

BA

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