# economic section

## Solution to Problem 532 | Economic Sections

## Solution to Problem 531 | Economic Sections

**Problem 531**

A 15-ft beam simply supported at the ends carries a concentrated load of 9000 lb at midspan. Select the lightest S section that can be employed using an allowable stress of 18 ksi. What is the actual maximum stress in the beam selected?

## Solution to Problem 530 | Economic Sections

**Problem 530**

Repeat Prob. 529 if the distributed load is 12 kN/m and the length of the beam is 8 m.

## Solution to Problem 529 | Economic Sections

**Problem 529**

A 10-m beam simply supported at the ends carries a uniformly distributed load of 16 kN/m over its entire length. What is the lightest W shape beam that will not exceed a flexural stress of 120 MPa? What is the actual maximum stress in the beam selected?