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[SEAOC] RE: [SEAOC] Rigid frame with masonry walls[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc <seaoc(--nospam--at)power.net>
- Subject: [SEAOC] RE: [SEAOC] Rigid frame with masonry walls
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Tue, 13 Aug 96 14:45:00 PDT
- Encoding: 66 TEXT
Prefabricated metal buildings routinely employ masonry walls and rigid frames. Proper allowance for lateral drift and deflection must be made. This tends to be a serviceability problem as opposed to structural as long as the connections allow differential in plane movement. (i.e. provide masonry expansion joints within 18" of the corner of the building) Out of plane force resistance for the masonry wall is generally provided by the steel building unless you are designing a short masonry wall in which case it is usually cantilevered from the foundation. Guidance for serviceability can be obtained from the AISC Design Guide #3 "Serviceability Design Considerations for Low-Rise Buildings". Note that a 10 year wind is used for serviceability. Use the ASCE 7-95 for the 10 year wind as opposed to the AISC Design Guide #3 rule of 75% of the 50 year wind. Greater care must be employed when seismic loads govern because of the amplification requirements for deformation compatibility. But if it is a low seismic high wind area, simply provide detailing and joints to allow for the calculated differential in plane movement. A number of connectors are available (Re: Heckman, Hohmann & Barnard, and AA) Look at the AA400 with the AA401C as an example of a connector that allows differential in plane movement while resisting out of plane forces. This is also the connector of choice for differential seasonal and thermal movement. Also bear in mind that the brick will have to move parallel differentially from the block. Avoid truss reinforcing. Harold Sprague Black & Veatch spragueho(--nospam--at)bv.com ---------- From: seaoc To: seaoc Subject: [SEAOC] Rigid frame with masonry walls Date: Tuesday, August 13, 1996 2:14PM Question: Is it practical to provide a high bay single story building with steel rigid framing and masonry walls? I've seen buildings detailed this way, but I question whether the masonry can handle the lateral movements to develop rigid frame action if it is tied to the steel frame. I am currently working on a building with a 3-ton bridge crane, to be steel framed with masonry veneer (brick/CMU). While a rigid steel frame could handle the loads, I am inclined to go with a braced frame to prevent damage to the masonry. Has anyone encountered a rigid frame building with masonry walls which has had damage due to the frame movement due to lateral loads? (This structure is in a low seismic area but potential hurricane winds.) ... ...
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