Bolt splicing at a single span.
Bolt splicing at a single span.
(OP)
A steel bridge is a 150' simple span having a bolt splice location at 40' from its support. I know that a good place to splice is at or near the dead load contraflexure but it can't happen to this bridge. So why is a special consideration for this kind of splicing calculation??






RE: Bolt splicing at a single span.
Good luck
RE: Bolt splicing at a single span.
Typically, multiple span beams are spliced at locations of zero or near zero bending moment. Since you have a simply supported beam, there are no zero moment regions except at the supports, where there would be no need for a splice. Therefore, it is reasonable to splice the beam nearer the supports than the middle.
RE: Bolt splicing at a single span.
I usually splice simple spans at 1/4 the span.
I have found that the reduction in moment here enables me to optimize the cross-section as well.
Regards
VOD
RE: Bolt splicing at a single span.
Note: Designing a splice for the full section capacity is not a bad idea. If your splice is too "efficient" (barely enough to be structurally adequate) you might need to consider changing the section property at the splice for another beam analysis.
RE: Bolt splicing at a single span.
As for the capacity, AASHTO is clear on what is required. Even if you have an area of low stress, you will still have to develop a certain level of the original section. That is why some many State DOTs have prescribed splice designs. The designs are based on developing the material section not the load.
RE: Bolt splicing at a single span.
from my understanding, I can splice anywhere I want and calculate in the same way even the splice loction is not near the dead load contrafluxure point.
Thanks again.