Concrete Beams & Joists
A concrete beam is a structural element that supports loads from floors, walls, and other beams. Concrete beams are made of concrete, which is strong in compression, and steel reinforcement, which is strong in tension. The steel reinforcement helps to resist the tensile forces that are created when the beam bends under load. Concrete beams are an essential part of any building or structure and are typically found in a variety of structures, including buildings, bridges, and dams.
The history of concrete beams can be traced back to the 18th century, when the first reinforced concrete structures were built in France and England. The first concrete beam was patented in 1867 by Joseph Monier, a French gardener. Monier used steel rods to reinforce concrete tubs and beams, which made them stronger and more durable. In the late 19th century, the use of concrete beams became more widespread, and they were used in a variety of structures, including bridges, buildings, and dams. Today, concrete beams are a common and important structural element in many types of buildings.
There are two main types of failure that can occur in a concrete beam: flexural failure and shear failure. Flexural failure occurs when the beam is unable to support the applied load and bends too much. Shear failure occurs when the beam is unable to resist the shear forces acting on it.
There are many ways to connect a concrete beam to a concrete column. The most common method is to use a shear key. A shear key is a projection on the face of the column that fits into a groove on the face of the beam. The shear key helps to transfer the shear force from the beam to the column. Another common method is to use a dowel. A dowel is a steel rod that is embedded in the concrete of the beam and column. The dowels help to transfer the tensile force from the beam to the column.
Concrete beams are used in a variety of buildings, including residential, commercial, and industrial buildings. They are also used in bridges, parking garages, and other structures. Concrete beams are strong and durable, and they can support a lot of weight in situations with a large amount of people.
