For the beam and loading shown, check if the maximum bending stress is less than the allowable bending stress using the ASD approach. The self-weight of the beam is denoted "waw", and the steel beam is a "W10x26". Assume the beam has an allowable stress due to bending of 21 ksi. See the next page for section properties of the steel beam. Assume the steel cross-section is being bent about its "strong axis" - i.e. the "x-axis". PL = 5.0 kip Wsw B 10 ft

A steel component is subjected to alternate cyclical loading. The steel follows Basquin's law for high cycle fatigue, o, x N = C, (where the stress amplitude is in MPa). Ignore the geometric detail and assume that Marin's modifying factors are all equal to 1. You are given the minimum stress ain = -213 MPa, the maximum stress omax = 213 MPa. The material data are Tensile strength oUTS = 539 MPa, Basquin's constant c, = 875 MPa, Basquin's exponent a = 0.085. a) Calculate the stress ratio R, the stress amplitude o, in MPa and the mean stress am in MPa. The answers are acceptable with a tolerance of 0.01 for R and of 1 MPa the stresses. R: MPa MPа b) Calculate the corresponding life, in 10° cycles, (tolerance of 0.1 106 cycles) N :

Determine (d) variable stress and (e) design factor