Timber beam moment/deflection question
Timber beam moment/deflection question
(OP)
Hello everyone,
I have a question regarding the moment and deflection calculation of this handrail beam that I have. I am attaching a picture to give you guys a look at what I am working with.
The hand railing is 4" x 4" and it is not attached half way, its just resting on that beam, it is however attached with a bolt at the bottom. My question is, when im looking for the resisting moment would I take 89/2 in the section modulus calculations or the full 89mm. Same goes for deflection, when I do the moment of inertia, would I do the full 89 mm or 89/2. If it is 89/2 then how would I incorporate the rest of the beam in the resisting moment/deflection or would it have no effect on it?
any help would be greatly appreciated, thanks!
I have a question regarding the moment and deflection calculation of this handrail beam that I have. I am attaching a picture to give you guys a look at what I am working with.
The hand railing is 4" x 4" and it is not attached half way, its just resting on that beam, it is however attached with a bolt at the bottom. My question is, when im looking for the resisting moment would I take 89/2 in the section modulus calculations or the full 89mm. Same goes for deflection, when I do the moment of inertia, would I do the full 89 mm or 89/2. If it is 89/2 then how would I incorporate the rest of the beam in the resisting moment/deflection or would it have no effect on it?
any help would be greatly appreciated, thanks!






RE: Timber beam moment/deflection question
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Timber beam moment/deflection question
RE: Timber beam moment/deflection question
The moment should be taken from the bolt as the fixed end. Make sure the bottom-extended end is attached firmly, but is long enough. The bending and bearing should be checked on the bolt and the extension (ie, the bolt is in tension, the extended end in compression - pushing on the framing)
RE: Timber beam moment/deflection question
Not only are hand rails a BIG safety item, the codes are very explicit on sizes, locations, etc.
Hire some help or get Real involved in this!!
RE: Timber beam moment/deflection question
RE: Timber beam moment/deflection question
RE: Timber beam moment/deflection question
BA
RE: Timber beam moment/deflection question