Skewback is a construction term used to refer to the inclined support of a load-bearing arch or lintel. The word is spelled as /ˈskjuːbæk/, with the IPA phonetic notation indicating the "sk" as a voiceless velar stop, "j" as a voiced palatal approximant, "u" as a long high back rounded vowel, and "æ" as a short front unrounded vowel. The word's spelling and sound are derived from the Old Norse word "skegg" which means "beard" and the English word "back."
A skewback is a structural element commonly found in architecture and engineering, particularly in masonry construction. It refers to a specially designed support that helps to transfer the weight of an arch or vault to a vertical wall or pier.
Typically made of stone, concrete, or brick, a skewback is positioned at the point where the arch or vault intersects with the supporting structure. It is placed at an angle to accommodate the oblique or sloping nature of the arch, hence the term "skew." The underlying purpose of a skewback is to distribute the load in a way that is both efficient and structurally sound.
Skewbacks play a crucial role in maintaining stability and preventing the collapse of arches and vaults. By effectively transferring the weight to the supporting structure, they ensure that the forces exerted by the arch are properly distributed and do not cause undue stress or deformation. Additionally, skewbacks help to counteract the horizontal thrust exerted by the arch, making it possible for the structure to remain stable and secure.
The design and configuration of skewbacks can vary depending on the specific architectural or engineering requirements. Factors such as the type of arch, the load to be supported, and the characteristics of the supporting structure all influence the dimensions and positioning of skewbacks. Their effectiveness is dependent on proper engineering calculations and an understanding of the principles of structural stability.
The word "skewback" originated from the combination of two words: "skew" and "back".
1. "Skew": The term "skew" comes from the Old Norse word "skjǫl" or "skjǫgr", which means "slanting" or "oblique". It has also been influenced by Middle Low German "schēwe", meaning "oblique".
2. "Back": The word "back" is derived from Old English "bæc", meaning "back" or "rear". This word can be traced back to Proto-Germanic "bakam".
When combined, "skewback" literally means a "slanted back" or an "oblique rear". It is a term often used in architecture and construction to refer to the inclined surface against which a load or thrust is received.