Anchorage in Civil Engineering: Types, Functions, and Applications

In civil engineering, an anchorage is a structural element designed to resist tensile forces and provide a secure connection point for cables, tendons, ropes, or other tension members. Anchorages transfer loads from the tensioned element into the ground or a structural mass, ensuring stability and safety.

Common Types of Anchorages

1. Deadman Anchorage: A buried mass (concrete block, steel plate, or heavy timber) embedded in soil, with a tendon attached. Used for temporary works, utility poles, and erosion control.
2. Rock Anchorage (Rock Bolt / Cable Bolt): High-strength steel bars or strands grouted into drilled holes in competent rock. Common in tunneling, slope stabilization, and foundation tie-downs.
3. Wall Anchorage: Mechanical or adhesive anchors (expansion bolts, screw anchors, epoxy-set rods) embedded into concrete or masonry walls to secure facades, brackets, or structural connections.
4. Ground Anchor (Tieback): A tendon (strand or bar) grouted into a drilled shaft in soil or rock, tensioned against a structural head. Used for retaining walls, excavation support, and dam stabilization.
5. Post-Tensioned Anchorage: Specialized anchorage assemblies (wedge plates, bearing plates, trumpets) that lock post-tensioning strands in concrete after tensioning. Essential for bridges, slabs, and containment structures.

Proper selection, design, and installation of anchorages are critical to the performance of bridges, buildings, towers, dams, and geotechnical structures.