The First Kind of Exercise Check the Strength of Beam Problem 1 Check the strength of section B 25 14.1 M(kN.m) M=- ×50x12=-25kN-m 25×103 max M2x0.050= 2.136×10-5 x0.05=58.5MPa>[o] Ma×0.130=152MPa[o 1 2 50 1 25 kN m 2 MB = −   = −  max 0 130 152 MPa> .   B z M I   − − =  = Check the strength of section B Problem 1 The First Kind of Exercise: Check the Strength of Beam M(kN.m) x O 25 14.1 B . . MPa . . I M σ Z B 0 05 58 5 2136 10 25 10 0 050 5 3 max  =   =  = − + + []