Need a book? Engineering books recommendations...
Re: Buliding steel frame's columns embedded in concrete[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaoc(--nospam--at)seaoc.org>
- Subject: Re: Buliding steel frame's columns embedded in concrete
- From: "Dennis S. Wish PE" <wish(--nospam--at)cyberg8t.com>
- Date: Fri, 17 Oct 1997 11:08:30 -0700
I am by no means an expert in steel construction, however, what you discribe is a typical moment connection where fixity is gained in the bottom of the columns and transfered to a concrete grade beam. The steel that you discribe are shear stirrups and would probably be spaced as close as 3" apart within one foot of the column, then 6" apart for the next foot or so and finally 8 to 12" apart for the remainder of the length of the grade beam. There should also be top and bottom horizontal steel runing through the grade beam that either passes the column and is bent down or up at the back of the gradebeam or is welded to the flange of the column. The moment reaction from the steel is transfered to the gradebeam which can be designed as a typical concrete beam with applied moments at the end AND which is considered as a beam on elastic foundation for design with consideration of soil capacity. Typically, the axial load is distributed below the column by means of a spread footing which the column is attached to and which acts as an erection pad prior to placing the grade beam. In most area's the grade beam is designed with concrete exceeding f'c of 3000 psi and current UBC requires special deputy inspection of the concrete to insure adequate placement of all steel. Sorry if this is too simplistic an explanation, but I'm not sure where you are comming from on this. I use this type of detail often for the design of laterally resisting frames in residential and unreinforced masonry structures because you can reduce steel size by providing fixity at the base rather than at the beam/column connection. Dennis Wish PE -----Original Message----- From: K. Hemmatyar <kch(--nospam--at)ultranet.ca> To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org> Date: Tuesday, October 14, 1997 4:00 PM Subject: Buliding steel frame's columns embedded in concrete >Recently I've noticed a two storey commercial building under the >construction here in our city, Vancouver (Canada.) The front steel moment >resisting frame of the building has its columns embedded in the concrete >foundation. I noticed that there are some stirrups around the columns in the >foundation. >These types are common in gas stations. Does anyone have any comment on this >type of column to foundation connection in a Commercial Building? > >Casey Hemmatyar, P. Eng. > > > >
- Prev by Subject: Re: Buliding steel frame's columns embedded in concrete
- Next by Subject: CA PE License!
- Previous by thread: Re: Buliding steel frame's columns embedded in concrete
- Next by thread: Re: SE requirements (LA high rises)