Thrust

Definition

Thrust is a lateral or inclined force resulting from the structural action of an arch, vault, dome, suspension structure, or rigid frame.

Purpose

The primary purpose of understanding and managing thrust in structural design is to ensure stability and integrity. Thrust forces must be counteracted to prevent structural failure, which is achieved through the use of abutments, tie rods, or other support mechanisms.

Examples of Use

1. Arches: Thrust forces in arches push outward at the base, requiring strong abutments to counteract these forces.
2. Domes: Thrust in domes is directed down and outward, necessitating a robust support structure or tension ring to maintain stability.
3. Suspension Bridges: Thrust forces in suspension bridges are managed by anchoring the cables securely to counteract the forces generated by the weight of the bridge and traffic.

Related Terms

• Abutment: A support structure that counteracts thrust forces at the ends of arches and bridges.
• Compression: A force that acts to compress or shorten the thing it is acting on, often counteracting thrust in structural elements.
• Tension: A force that acts to extend or lengthen the thing it is acting on, often used to counteract thrust.

Notes

• Engineering Design: Proper calculation and management of thrust are crucial in the design of arches, domes, and similar structures to ensure safety and longevity.
• Materials: The materials used in structures subject to thrust must be chosen for their ability to withstand these forces without failure.