×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Concrete Shear Wall with Steel Moment Frame on Top

Concrete Shear Wall with Steel Moment Frame on Top

Concrete Shear Wall with Steel Moment Frame on Top

(OP)
I am working on a 26’-0 high, single story, religious facility where the main (gravity) load-bearing construction is heavy timber, with glulam columns and beams with a flexible metal roof deck. The shell of the building consists of storefront glazing spanning between site cast or precast panels that are 18’-0 high, 12’-0 wide and located 20’-0 on center. There are clerestory windows on top of the concrete panels that continue up to the roof deck. To be able to transfer the lateral forces from the roof deck to the foundation, I was thinking about building an 8’-0 high +/- moment frame at each panel out of tube steel, with its base at the top of the concrete panels and the top beam connected to the roof deck. I am hoping this frame could be hidden in the mullion space. This structure is in a SDC A, and wind loading controls. Does this seem like a viable means of transferring the lateral load to the foundation? I’ve never had the opportunity to do a mixed system like this before, using material with such different rigidities. Can anyone lead me to a reference or an example so I can feel comfortable that I’m approaching this design properly.

Thanks.

RE: Concrete Shear Wall with Steel Moment Frame on Top

What you are proposing sounds feasible, but you should contact the precast concrete wall supplier right away to see if it is OK.  They will need to design for the loads imposed by your moment frames.

DaveAtkins

RE: Concrete Shear Wall with Steel Moment Frame on Top

(OP)
I am revisiting this again, because the owner and architect have made some changes. The shear walls will be wet cast, so I will be the one designing the walls for the load imposed by the moment frames. The new twist is that instead of metal roof deck, laminated T&G timber decking will be used. This means that I need to transfer the diaphragm load going into the wood roof into the tube steel of the moment frame. Any advice on how to make a connection between the wood deck and the hot-rolled steel to properly transfer the loads from the wood deck to the frame?

RE: Concrete Shear Wall with Steel Moment Frame on Top

Connect a top countersunk wood nailer (thick enough to receive the deck nails) with threaded studs welded to the TS member (at intervals designed to transfer the diaphragm shear).

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources