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RE: CMU Lintels[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: CMU Lintels
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Fri, 23 Oct 1998 15:53:53 -0600
Richard, I generally locate a control joint within about 2' from one side or the other to keep a shrinkage crack from trying to form in the opening area. This makes the column relatively small when compared to the lintel beam. Therefor I size the flexural rebar in the lintel beam for a simple span element. Even if the compression block stays within the grouted section you still should check the horizontal shear through the face shell and bedded joints. Basically you have a composite section the same as concrete and structural steel (the studs transfer the horizontal shear) or double walled fiberglass (the polyisocyonate insulation transfers the horizontal shear). I generally grout the entire section that I use as a lintel. There are some good examples of lintel design in the Corps of Engrs Structural Design for Masonry TM 5-809-3. Harold Sprague, P.E. The Neenan Company harold.sprague(--nospam--at)neenan.com -----Original Message----- From: rlewis(--nospam--at)techteam.org [mailto:rlewis(--nospam--at)techteam.org] Sent: Thursday, October 22, 1998 2:36 PM To: seaint(--nospam--at)seaint.org Subject: CMU Lintels I want to get so others opinions on design of reinforced CMU lintels above openings, specifically larger openings. In the past I have designed openings, say 9 feet wide for a garage door, by using the total depth of the wall above the opening. Since I almost always have a bond beam at the top of the wall I design the lintel as fixed ends using the bond beam reinforcing as top bars and the lintel reinforcing as bottom bars. I check the shear based on the entire depth of the wall above the opening and make sure it is sufficient for unreinforced shear on the face shell width only. I check the depth of the compression block to be sure it stays within the solidly grouted top of wall bond beam and the lintel bond beam. Does anyone see any problems with this design concept which I haven't taken into consideration? __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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