Holdown (holdown, hold-down, or hold down) or tie-down in

structural engineering Structural engineering is a sub-discipline of civil engineering in which structural engineers are trained to design the 'bones and joints' that create the form and shape of human-made Structure#Load-bearing, structures. Structural engineers also ...

refers to the steel device or hardware that is installed at the end of a plywood

shear wall A shear wall is an element of a structural engineering, structurally engineered system that is designed to resist in-Plane (mathematics), plane lateral forces, typically wind and earthquake, seismic loads. A shear wall resists loads parallel to ...

. The hold downs provide uplift resistance against the overturning moment imposed on the wall due to "in-plane" lateral load applied at the top of the wall. A hold-down may also refer to clamping device used to anchor a pipe to a structural steel element or concrete floor or allow movement of the pipe in an axial direction.Hold-Down Pipe Clamps
Piping Technology and Products, (retrieved May 2012). At the bottom, the hold down is connected to the concrete foundation or structural slab by an ''embedded'' or ''epoxied''

anchor bolt Anchor bolts are used to connect structural and non-structural elements to concrete.. The connection can be made by a variety of different components: anchor bolts (also named fasteners), steel plates, or stiffeners. Anchor bolts transfer diffe ...

. At the top, the hold down is connected to a wood post with screws, nails or bolts.

References

{{DEFAULTSORT:Hold Down (Structural Engineering) Structural connectors