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A torsion box is a structure that resists torsion under an applied load using two thin layers of material and a lightweight core. It is used in various applications such as doors, tables, skis, wings and bridges.
Frame and panel, also called rail and stile, is a woodworking technique for making doors, wainscoting, and other decorative features. Learn about the basic components, methods, and styles of frame and panel construction.
A hollow-core slab is a precast concrete floor slab with tubular voids that reduces weight and cost. Learn about its production, use, and advantages in construction and bridges.
A voided biaxial slab is a type of reinforced concrete slab with air-filled voids to reduce weight and volume. Learn about its theory, structure, construction, failures and comparison to other slab types.
A safe room or panic room is a fortified room that provides a shelter or hiding place for the inhabitants in case of a threat. Learn about the different types, techniques and features of safe rooms, such as communications equipment, emergency supplies, and anti-piracy systems.
Learn about the origin, function and design of doors, from ancient Egypt to modern times. Find out how doors are made of different materials, such as wood, stone, metal and glass, and how they can be hinged, sliding, folding or automatic.
A tube is a structural system where a building acts like a hollow cylinder, cantilevered perpendicular to the ground, to resist lateral loads. Learn about the history, concept, and variants of tubular frames, such as framed, trussed, hull and core, and bundled tubes, with illustrations and examples.
Cope and stick is a woodworking technique for joining frames and panels with molded edges. Learn how to cope and stick doors, wainscoting, and furniture features.