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Re: center support beamFrom: info@builderswebsource.com
Category: Structural
Remote Name: 63.198.181.43
Date: 14 Aug 2002
Time: 02:37 AM
CommentsMost likely, the existing beam was undersized for the job. However, in order to compute the size of a new beam, a full structural analysis is necessary. For example, any loads imparted to the center beam from walls and/or roof must be taken into consideration. This is in addition to the typical 40 psf live load and 10-20 psf dead load (assuming a single story). Furthermore, other loads, such as seismic, wind and snow which could indirectly impart temporary loads on the beam must also be considered. The type and quality of wood, the number and spacing of bolts, as well as the tributary area is needed. Then, you must select certain design criteria for deflection. The stiffer the floor, the less the tolerable deflection is. While the building code typically reocmmends a maximum deflection of SPAN/360, a stiffer floor that has a higher quality feel will have a deflection of SPAN/480 to SPAN/1000. Since each of these parameters impacts the beam design, we cannot provide any more general recommendations without further information and a detailed loading diagram of your actual residence. Builders Websource
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