Question interpretation of "r" value in AWWA code
Question interpretation of "r" value in AWWA code
(OP)
I would like to get an answer from those who used AWWA code (Factory-Coated Bolted Carbon Steel Tanks for Water Storage) before.
in page 15 of this code, it says:
r = force transmitted by bolt or bolts at the section considered, divided by the tensile force in the member at that section.
My question see attached pdf file.
Thanks.
in page 15 of this code, it says:
r = force transmitted by bolt or bolts at the section considered, divided by the tensile force in the member at that section.
My question see attached pdf file.
Thanks.






RE: Question interpretation of "r" value in AWWA code
RE: Question interpretation of "r" value in AWWA code
RE: Question interpretation of "r" value in AWWA code
thank you for sharing your opinion, but it does not answer my question.
Here is the situation, on my desk, there are 2 design proposals from 2 different engineering company for a same size of water tank project.
One company interpret "r" value in AWWA Code as the fraction of the force in one bolt out of that section, therefore r=0.5, which results in a lighter design.
the other company interpret "r" value in AWWA Code as the force in the bolts (in this case 2 bolts) divided by the force in that section, therefore r=1.0, which results in a heavier design.
the original paragraph in AWWA code is as follows:
r = force transmitted by bolt or bolts at the section considered, divided by the tensile force in the member at that section.
what I would like to know is which interpretation for the "r" value in AWWA code is correct. Has anybody in this forum ever designed bolted water tank before? and how did you handle "r" value when you design bolted water tank?
Thanks.
RE: Question interpretation of "r" value in AWWA code
I interpret the AWWA the same as the company that uses r=1.0. The bolt closest to the end of the plate has a force of 0.5T but the plate has a force of 1.0T; therefore, the r value is 1.0. It is a question of bolt force vs. plate force at the section considered.