A shear wall is a vertical structural element designed to resist lateral forces, mainly wind and earthquake loads, that act parallel to its plane. Built from reinforced concrete, wood panels, masonry, or steel, a shear wall collects horizontal forces from the floors and roof and carries them down to the...
A tuned mass damper is a heavy mass, usually steel or concrete, mounted near the top of a tall building and tuned to swing against the structure's natural sway. By moving out of phase with wind or earthquake motion, it absorbs vibration energy and keeps the building stable and comfortable....
Skyscrapers stay up because two systems work together: a deep foundation that transfers the building's weight to firm soil or bedrock, and a stiff vertical skeleton of columns, cores, and frames that resists wind and earthquake forces. Every load, from gravity to a typhoon gust, follows a continuous path down...
Reinforced concrete is a composite material that joins concrete, which is strong under compression, with steel bars that are strong under tension. The steel carries the pulling and bending forces that would crack plain concrete on its own, so the two materials act as a single structural unit in beams,...
Post-tensioned concrete is a reinforcing method where high-strength steel tendons are pulled tight after the concrete has hardened, squeezing the member into compression. That built-in compression lets the concrete resist tension loads it normally cracks under, so engineers can build longer spans, thinner slabs, and more open floor plates. Concrete...
The footing vs foundation question comes down to scope: a footing is the widened base that sits directly on the soil and spreads a load across more ground, while the foundation is the whole substructure that carries the building down to that footing. Every footing is part of a foundation,...
A pile foundation is a deep foundation made of slender columns of concrete, steel, or timber driven or bored into the ground. It carries a structure's load past weak surface soil down to stronger soil or rock, supporting buildings, bridges, and towers where shallow footings would settle or fail. When...
Fallingwater was built directly over a waterfall by anchoring reinforced concrete cantilevers into the natural sandstone bedrock of Bear Run, Pennsylvania. Frank Lloyd Wright designed the house in 1935 for the Kaufmann family so its terraces hover above the falls, with the stream running beneath the living room rather than...
The dome of Hagia Sophia works by carrying its weight through four curved triangular pendentives down to four massive piers at the corners of a square base. Two flanking semi-domes absorb the outward thrust, while a ring of 40 windows at the base lightens the rim and floods the interior...
