The First Kind of Exercise Check the Strength of Beam Problem 1 25 Check the strength of section C 14.1 M(kN.m) In order to determine the bending moment diagram of section C,the position of section C should be calculated firstly. F=fR4-qm=0x-35-075m 950 1 Me=F4x-29r2=14.1kN-m Mcx0.130 14.1×103 2136x10×0130=858MPa>[o Conclusion:the strength is not safeIn order to determine the bending moment diagram of section C, the position of section C should be calculated firstly. FS = FRA − qx = 0 0.75m 50 R 37.5 = = = q F x A 2 R 1 14 1kN m 2 . M F x qx C A =  − =  + [] Conclusion: the strength is not safe. Check the strength of section C Problem 1 The First Kind of Exercise: Check the Strength of Beam M(kN.m) x O 25 14.1 C . . MPa . . . I M σ Z C 0130 858 2136 10 141 10 0130 5 3 max  =   =  = − +