What type of seismic system is this? 1

[dcivil]

http://perka.com/5400.html

Cantilever column?

Thanks

 

[msquared48]

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

 

[dcivil]

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?

 

[msquared48]

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

 

[wannabeSE]

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

 

[Den32]

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.

 

[BAretired]

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