## Determine the normal stress on the beam’s cross-section 1.2 feet below the top of the beam.

9. You are analyzing a 12-foot-long concrete beam with a rectangular cross-section with the width at 2.5 feet and depth at 4.4 feet. A maximum moment of 1.3 × 106 foot pounds is applied to the beam due to a bending load acting at the mid-span of the beam. a. What is the bending load to induce this moment?

b. Measuring from the top of the beam, where on the beam’s cross-section is the normal stress = 0, in feet?

c. What is the maximum tensile stress on the beam, in psi, and where on the beam’s cross-section does it occur?

d. Determine the normal stress on the beam’s cross-section 1.2 feet below the top of the beam.

### Explain why of length-of-bend to sheet thickness increases.

As noted in Fig. 7.16, the state of stress shifts from plane stress to plane strain as the ratio   of length-of-bend to sheet thickness increases. Explain why. This situation….

### Describe the material properties that have an effect on the relative position of the curves shown in Fig. 7.19.

Describe the material properties that have an effect on the relative position of the curves   shown in Fig. 7.19. Observing curves (a) and (c) in Fig. 7.19 on p…..

### Why do tubes have a tendency to buckle when bent?

Why do tubes have a tendency to buckle when bent? Experiment with a straight soda straw, and describe your observations. Recall that, in bending of any section, one-half of the….