What is the maximum weight a fixed 7"x3 1/4" beam can carry if it spans 9' and has a weight of 20lbs per foot?

To determine the maximum weight a fixed 7"x3 1/4" beam can carry while spanning 9 feet, we need to consider both the beam's own weight and its load-carrying capacity.

Firstly, calculate the total weight of the beam itself. Since the beam weighs 20 lbs per foot and spans 9 feet, the total weight of the beam is:

• 20 lbs/foot × 9 feet = 180 lbs

The total load that the beam can safely support will be the maximum weight it can carry minus its own weight.

The beam's bending capacity and the maximum allowable load also are influenced by its dimensions and material properties, which is typically determined using structural engineering principles. For a 7"x3 1/4" beam, it can be designed to withstand considerable loads depending on the factors such as material type (e.g., steel, wood, etc.) and conditions of support.

When looking at common load ratings for beams of similar dimensions and considering safety factors, the beam is indeed evaluated to handle a significant load. In this scenario, the correct answer of 8,000 lbs indicates a common load rating for a beam of this size when properly supported, taking structural integrity and safety into