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Maximum bending moment in simply supported beam under equally spaced in the middle uniform load.

Total distributed load

$ W_d = 15000 \; \;
N $

Distributed load distance

$ b = 0.07 \; \;
m $

Distance between load and support

$ a = 0.0225 \; \;
m $

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formula
syntax

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formula syntax

M_{B_{d_{max}}} = ( W_d / 4 ) * ( 2 * a + b - b / 2 )