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Α' C Z tw V b M₂ B₁ h D
Problem 5.2 The beam cross-section shown in Figure P5.2 is subjected to an internal bending moment with magnitude |M₂|= 75000 Nm and internal shear force with magnitude [V]=80 kN, both action in the directions shown on the figure. The geometry of the beam is given by h=325 mm, b=310 mm, tw=15 mm and t-25 mm. a) calculate the maximum tensile normal stress due to bending and describe along which line this stress occurs, b) calculate the maximum shear stress in the beam cross-section using the approximate formula and describe along which line this stress occurs c) calculate the maximum shear stress in the beam cross-section using Grasshoffs Formula and compare the obtained result with the result obtained in question b), d) calculate the shear stress in the flange-weg junction (marked J) using Grasshoffs Formula. Ans.: a) ox=32.5 N/mm², b) t=19.4 N /mm², c) t=18.5 N/mm², d) t=16.5 N/mm²