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Nesgroup address: alt.building.construction - Date & Time for the message: Wed, 25 May 2005 23:53:32 GMT
/ Author of the message: Bob Morrison |
Title of the message: |
Re: joist span calculation formula?
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Text of the message: |
In a previous post John says... > I wonder if anyone can point me in the direction of a formula for > calculating the maximum span of a joist? > John: There are three parts to your question: bending strength,shear strength and deflection limitations. For floor joists with normal floor loading we can generally ignore the shear calculation, so that leaves flexure and deflection. For flexure, the bending formula is fb = M/Sx or fb = (wl^2)/8Sx where Sx = (bd^2)/6 fb = (6wl^2)/(8bd^2) L = sqrt[(8bd^2)*fb/(6w)] make sure your units are compatible For deflection of floors: L/360 = (5wL^4)/(384EI) where I= (bd^3)/12 I will leave you to work out the math. Your "maximum" span is the smaller of the two L's -- Bob Morrison, PE, SE R L Morrison Engineering Co Structural & Civil Engineering Poulsbo WA . |
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Estaplace.com is one the Ceglia Giovanni projects, started on 20 July 2005, and online since 20 August as a real estate platform for listings, mainly operating on the Italian and American/English market in the Internet, Estaplace would like to become the point of referiment for home sellers and home buyers, a site where private owners or real estate agencies can have the possibility to show their offers to the world. Estaplace.com is only one of the Giovanni Ceglia's sites. Everyday Giovanni Ceglia works to improve new Internet tools and services for online marketing and business. Estaplace.com will become the biggest portal for real estate business and investments online.