strengthening
strengthening
(OP)
when modifying a structural element results in increased load, does it make sense to design for added load or for the whole load?
for example, a truss bottom chord (2x8, SP#1, metal plate connection, at heel)
existing bottom chord tension 8.25 kips
new loading 9.9 kips
If I add a side plate, and just design the new member and connection for 1.74 kips, is that sufficient? Is there enough yield, or strain, to share load before the original member fails?
for example, a truss bottom chord (2x8, SP#1, metal plate connection, at heel)
existing bottom chord tension 8.25 kips
new loading 9.9 kips
If I add a side plate, and just design the new member and connection for 1.74 kips, is that sufficient? Is there enough yield, or strain, to share load before the original member fails?






RE: strengthening
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: strengthening
Might be some information in the Wood Handbook, USDA, or other sources investigating tensile strains in wood. Also, must consider joint slip data from TPI, SBCA. Joint slip might be the deciding factor in the load sharing question.
Anybody have a usable tensile strain value for southern pine?
RE: strengthening
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: strengthening
link to southernpine.com
RE: strengthening
Dik
RE: strengthening
RE: strengthening
RE: strengthening
The problem with these kinds of reinforcements or repairs is that the existing loaded joint or member must move/slip/strain some more (beyond its existing state) before the new member starts to come into play. And, during that stage of the loading process, you may be seriously overloading/overstressing the existing components. The best thing to do is to make some effort to unload that members or joints by taking the existing load off of them. Then apply the reinforcement and remove the shoring, and you can start to consider their sharing of the load in accordance with their strength and stiffness.
RE: strengthening