EXAMPLE 3-6 Figure 3-16 (a) Beam loaded in two planes; (b) loading and bending-moment diagrams in xy plane; (c) loading and bending-moment diagrams in xz plane. As shown in Fig. 3-16a, beam OC is loaded in the xy plane by a uniform load of 50 lbf/in, and in the xz plane by a concentrated force of 100 lbf at end C. The beam is 8 in long. 50 lbf/in 0 1600 lbf-in 400 lbf 50 lbf/in OB M. (lbf-in) 0 -1600 800 lbf-in, (a) 100 lbf 100 lbf tc 100 lbf (b) My (lbf-in) 800 0 Load and Stress Analysis 93 (a) For the cross section shown determine the maximum tensile and compressive bending stresses and where they act. (b) If the cross section was a solid circular rod of diameter, d = 1.25 in, determine the magnitude of the maximum bending stress. 1.5 in X 0.75 in C Find Kt, Kts, Kf, Kfs for a grooved round bar with a diameter of 1.5", and a groove radius of 1/8". The steel has a Sut-100 ksi.