Mechanical engineeringLesson 3 of 3 in the course Strength of materials

Beam Behavior: Supports, Bending, Stiffness, and Bracing

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

A beam is a structural element that primarily resists loads applied across its long axis. Beams appear in buildings, bridges, vehicles, aircraft, and machinery. Understanding how a beam carries loads and how its supports constrain it is a foundation for structural design.

A beam is an element whose main structural action is resisting loads applied laterally—across, rather than along, its long axis. These loads make the beam bend. A column or strut, by contrast, is commonly described as carrying loads along its length, often in compression.

All flashcards

What is a beam?
A structural element whose primary action is resisting loads across its long axis by bending.
How is a beam different from a column or strut?
A beam mainly resists lateral loads across its length. A column or strut commonly carries loads along its length, often in compression.
What is a simply supported beam?
A beam supported at its ends so that the ends can rotate and do not resist bending moments.
What is a cantilever?
A projecting beam fixed at one end and unsupported at the other.
Describe the basic load path from a beam to the ground.
The beam transfers loads to supports such as columns, walls, or girders; those structural members pass the loads onward until they reach the ground.

Quiz questions

  1. Which beam theory accounts for shear deformation when it is significant?Answer: Timoshenko beam theory
  2. What effect do released tendons produce in a prestressed concrete beam?Answer: Eccentric compression that creates an internal moment
  3. Why is an I-shaped section efficient for bending in its intended orientation?Answer: Much of its material lies far from the neutral axis.
  4. In trench bracing, what is the primary structural role of struts supporting walers?Answer: They mainly carry axial loads transferred from the walers.
  5. How does a fixed beam differ from a simply supported beam at its ends?Answer: A fixed beam's ends are restrained against rotation.

Based on the Wikipedia article Beam (structure), licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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