A concrete beam is reinforced by three steel rods placed as shown. The modulus of elasticity is 3 × 106 psi for the concrete and 29 × 106 psi for the steel. Using an allowable stress of 1342 psi for the concrete and 20 ksi for the steel, determine the largest allowable positive bending moment in the beam. 16 in. -in. diameter 8 in. 2 in. The largest allowable positive bending moment in the beam is kip-ft.

Compare the engineering and true secant elastic moduli for the natural rubber in Example Problem 6.2 at an engineering strain of 6.0. Assume that the deformation is all elastic.

Estimate the transverse tensile strength of the concrete in Problem 12.6.

The data in Table 1.5.3 were obtained from a tensile test of a metal specimen with a rectangular cross section of 0.2011in.2 in area and a gage length (the length over which the elongation is measured) of 2.000 inches. The specimen was not loaded to failure. a. Generate a table of stress and strain values. b. Plot these values and draw a best-fit line to obtain a stress-strain curve. c. Determine the modulus of elasticity from the slope of the linear portion of the curve. d. Estimate the value of the proportional limit. e. Use the 0.2 offset method to determine the yield stress.