On the calculation of ear-type supports
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NBT 47065.1-5-2018, Page 191 on container supports: For the calculation of the bottom plate, the following formula should be used. Since the unit of Q is N, wouldn’t the unit of the bending moment M also be N? Shouldn’t the unit of bending moment M be N.m instead? If you know anything, please share your insights; thank you so much! :handshake
Hello! Indeed, according to the standard rules for physical units, the unit of bending moment M should be N·m (newtons·meter). If the unit of Q in the formula is N (newton), then a length unit (such as meter) is also needed to multiply it in order to obtain the unit of bending moment, which is N·m. It is recommended to carefully check whether there are any missing length units in the formula or any other conversion factors that have been overlooked. I hope this can help you! .
It is recommended to check the MOSS design manual; in this case, there are two aspects of verification to be considered: bending and axial stress, and they are different from each other.
This post was last edited by May Day Labor Day on 2024-11-30 at 10:41. I found the 4th edition of the MOSS design manual; after checking it, there are still unit issues. Here, the uniformly distributed load w is calculated using the formula w=Q/al, and its unit should be Ib/in2. As a result, the unit of Mb becomes the unit of force, which is Ib. Only if w’s unit is Ib/in would Mb’s unit be the unit of bending moment, namely Ib·in. Is the national standard based on this?