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Internal Forces in Box culverts

Internal Forces in Box culverts

Internal Forces in Box culverts

(OP)
Hello everyone.

I have 2 questions.

(1) I am calculating the reaction force on box culvert junction structures which connect 2 sections at an angle of 90 degrees.  This is an improvement of an existing canal, and this extreme angle is the result of resettlement constraints.
Using the momentum equation:
     Reaction Force (x direction) = (M[out]  -  [M-in]) -     (pressure[in]  - pressure[out])
For this case, there is no flow out in the x direction, so the equation becomes
     Rf (x direction) = -M[in] - pressure[in]
Is this the right approach?  What influence does the flow out in the y direction have?  Should I calculate it and sum to find a total reaction force? I don't think that is valid since cosine 90 deg is 0.


(2) Related to the above: Does anyone have any advice on calculating the internal forces in multicell box culverts? I am familiar with the formula for circular pipe, but I don't think that is applicable.

Thanks
Nick
Ho Chi Minh City, Vietnam

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