![]() I would suggest using Simpson-type joist/column brackets throughout. The details is where people run into trouble, i.e. Whatever you do, pay special attention to the connections of the joists to the beams, beams to the columns, and the columns to the concrete. I did not look into glulams, as others have that pretty much covered and there are charts all over the place. You would have to beef up the end joists, as the center beam would be connecting to this. Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12. A ridge board is a non-structural member that serves as a prop for opposing rafters to rest against and connect to. Abodo Span Tables +64 (0) .nz 3 Ron O’Hara BE (Civil) CMEngNZ David King ME (Civil) CMEngNZ CPEng IntPE STRUCTURAL CERTIFICATION SPAN TABLES FOR ABODO WOOD Incorporating span tables for: Verandah beams, rafters and posts GL8 grade. You would now have three beams, which would reduce the load tributary area. Ridge beam sizing is based on the span of the beam between supports, and the amount of roof load supported by the beam. You would have to run a cost comparison on using these beams compared to glulams, but another option would to have a beam in the center of the platform. Special Bay Ridge District Special Bay Street Corridor District Special. Now that we’ve covered the formula and an example, let’s address some frequently asked questions to clarify any doubts you might have. Shear in the beam is 84psi and allowable is 70psiīoth situations assume that the platform is separate from the building frame structure and you have a beam on each side of the long sides, so there is only a 4' wide load tributary area on each beam. Table 2 of paragraph (c) of Section 23-664. So, for this example, the calculated ridge beam size (RB) is approximately 0.36 inches. In other words, how much a joist or rafter bends under the maximum expected load. This data should not be used for look-alike or substitute products. This would be on the high side if you plan on loading it pretty light, but remember that 100psf includes the weight of the platform. Stiffness of structural members is limited by maximum allowable deflection. Wesbeam e-beam Span Tables Roof Members Rafters 4 Roof Beams 6 Strutting Beams 8 Strutting-Counter Beams 10 Strutting-Hanging Beams 11 Counter Beams 12 Verandah Beams 13 Wall Members. ![]() This is still higher than the allowable but is assuming 100psf. Shear in the beam is 169psi and allowable is 70psiįor the 9.5' span using same loading and beam size, the bending stress is down to 860 psi. Running some quick numbers and only checking bending:įor the 19' span using 2x12s bolted together (neglecting the steel plate, don't have time to do a transformed section calc for the steel plate) and using 100psf loading, you get a bending stress of 3400psi and a typical allowable bending stress is 750psi depending on the wood type.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |