Anchorage

Definition

Anchorage refers to an attachment system designed to resist movement in structures, which may result from forces such as overturning, sliding, or uplift. Common types of anchorage include tie-downs (hold-downs) for preventing overturning and uplift, and anchor bolts for resisting sliding.

Purpose

The primary purpose of anchorage is to secure structural elements in place, ensuring stability and integrity under various loads and conditions. Anchorage systems are essential in preventing structural failure due to external forces such as wind, earthquakes, and gravity. By providing resistance to movement, anchorage helps maintain the safety and durability of buildings and other structures.

Examples of Use

1. Residential Buildings: In residential construction, anchorage systems like tie-downs are used to secure the roof and walls to the foundation, preventing uplift and overturning during high winds or seismic activity.
2. Commercial Structures: In commercial buildings, anchor bolts are used to attach steel columns to concrete foundations, providing resistance to sliding and ensuring the stability of the entire structure.
3. Bridges: Anchorage systems are used to secure bridge components to their foundations, preventing movement due to dynamic loads from traffic and environmental forces.
4. Retaining Walls: Tie-backs and anchor bolts are used in retaining walls to prevent sliding and overturning caused by soil pressure.
5. Telecommunication Towers: Anchorage systems are critical in securing towers to their bases, ensuring they remain upright and stable under the force of wind and other environmental factors.

Related Terms

• Tie-Down (Hold-Down): A device used to secure structural elements and prevent uplift and overturning.
• Anchor Bolt: A bolt embedded in concrete or masonry to secure structures and prevent sliding.
• Foundation Anchor: An anchoring system that connects the structure to its foundation, providing stability and resistance to movement.
• Seismic Anchor: A type of anchorage designed specifically to resist seismic forces, preventing structural damage during earthquakes.
• Load Distribution Plate: A component used in conjunction with anchors to distribute loads evenly across a larger area, reducing stress on individual points.

Notes

• The design and selection of anchorage systems depend on the specific loads and forces they need to resist, as well as the type of structure and materials involved.
• Building codes and standards often provide guidelines for the proper installation and use of anchorage systems to ensure they meet safety and performance requirements.
• Regular inspection and maintenance of anchorage systems are essential to ensure their continued effectiveness, especially in structures exposed to harsh environmental conditions or dynamic loads.
• Advanced anchorage systems may incorporate materials such as high-strength steel or specialized composites to enhance their resistance to movement and durability.