Arch Voussoir

Arch Voussoir

An arch voussoir is a wedge-shaped stone that is used to construct a masonry arch. The voussoirs are laid in a continuous radial pattern, with the centermost voussoir, known as the keystone, providing support for the entire arch. The weight of the superstructure is transferred to the voussoirs via the arch's extrados, or outer curve. This arrangement of the stones is known as an arch ring, which is designed to disperse the load evenly. The arch rings can be made of a variety of materials, including stones, bricks, and even steel. As the voussoirs are laid, the weight of the superstructure is transferred onto the keystone, which is secured in its position by the compressive force of the surrounding voussoirs. Arch voussoirs are typically made of stone, which is a durable and long-lasting material. The stones are carefully cut and shaped to fit together tightly, creating a strong and stable arch. The use of arches in architecture dates back to ancient times, and they have been used in a wide variety of structures, from bridges and aqueducts to cathedrals and palaces. One of the key advantages of using arch voussoirs in construction is their ability to distribute weight evenly. This makes them ideal for supporting heavy loads, such as the weight of a roof or the pressure of water in an aqueduct. Additionally, arches are able to span greater distances than other types of structures, making them useful for creating large, open spaces. In modern construction, arch voussoirs are often used in combination with other materials, such as steel or concrete, to create structures that are both strong and aesthetically pleasing. Architects and engineers continue to innovate and refine the use of arches in construction, finding new ways to use this ancient technology to create modern, sustainable buildings.

masonry arch, keystone, arch ring, stone, load distribution

— William Robinson