support action first
See the hogging at the internal support.
Let L be the distance between the two supports and a the unloaded overhang length beyond support B. A UDL w acts over the overhang only, so the resultant wa acts at a/2 beyond B.
Equilibrium relationships
RA = -wa2/(2L) · RB = wa(L + a/2)/LMB = -wa2/2The free-end movement is evaluated from the elastic beam solution using the supplied E and I. The sign convention reports the support moment as hogging and flags uplift where the idealised reaction becomes negative.
Assumptions and limits
- Two simple supports with a single right overhang and constant section stiffness.
- One downward UDL on the overhang only; no loads are applied on the support span.
- Small-deflection Euler-Bernoulli response without shear deformation or support flexibility.
- Uplift, hold-down, bearing, lateral stability, self-weight, load combinations, and code design require separate review.