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- To: seaoc(--nospam--at)seaoc.org
- Subject: TROPICAL HARDWOODS
- From: uthoff(--nospam--at)S6.hninc.com
- Date: Mon, 29 Sep 1997 17:28:54 -0800
- Receipt-requested-to: uthoff(--nospam--at)S6.hninc.com
I am looking for the shear strength of "ipe", a Brazilian tropical hardwood for use in a boardwalk. Yes, it is spelled IPE. Other common names for it include Amapa (Mexico) & Lapacho negro (Argentina). Some good news and bad news. The bad news is the boardwalk needs to allow for a 70,000 pound fire truck to cross (16,000 pound wheel load). The good news is the boardwalk planks bear on sleepers which bear on a grout bed which bear on a structured concrete floor, so if a plank fails, the truck won't fall too far! I have found the following values for ipe (ultimate values I think). Bending strength 22,000 to 28,000 psi (depending on moisture content) Modulus of elasticity 2,920,000 to 3,350,000 psi Maximum crushing strength 10,350 to 14,000 psi Any thoughts on factors of safety to apply to the above values for use in allowable stress design? Or if LRFD (yikes!), any thoughts on capacity reduction factors (phi) combined with load factors? Also I could not find a shear strength. (Something equivalent to 95 psi for Douglas Fir Larch). Has anyone worked with ipe before? I thought about proportioning the shear strength up based on the ratio of modulus of elasticity to get a ballpark estimate. Steve Uthoff, S.E.
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