The under, or concave, side of the voussoir is called the intrados or soffit, and the upper, or convex, side, the extrados of the arch. From Wordnik.com. [The Catholic Encyclopedia, Volume 1: Aachen-Assize] Reference
It was determined to attempt to stop these leaks by the application of a water-proof cement coating on the intrados of the arch. From Wordnik.com. [Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158] Reference
The stability of such structures depends on the position of the line of pressure relatively to the intrados and extrados of the arch ring. From Wordnik.com. [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference
The stability of such structures depends on the position of the line of pressure in relation to the extrados and intrados of the arch ring. From Wordnik.com. [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference
The reinforcement consists of arch and transverse bars; the arch bars are spaced 6 ins. on centers 2½ ins. from both extrados and intrados, and the transverse bars are spaced 24 ins. on centers inside both lines of arch bars. From Wordnik.com. [Concrete Construction Methods and Costs] Reference
For instance, a soft clay arch of larger dimensions, under the condition described early in this paper, would undoubtedly stand if the rods supporting the intrados of the arch were keyed back to washers covering a sufficiently large area. From Wordnik.com. [Pressure, Resistance, and Stability of Earth American Society of Civil Engineers: Transactions, Paper No. 1174, Volume LXX, December 1910] Reference
These spans are dictated by the coursing of the arches: the aim is to achieve high quality masonry with the height of the arch, from the intrados at the spring point to the extrados at the key-stone, contained within the height of two courses of earth blocks. From Wordnik.com. [Chapter 7] Reference
Again, on the following page, a somewhat similar qualification should be added to the sentence referring to the soft clay arch, that it would "stand if the rods supporting the intrados of the arch were keyed back to washers covering a sufficiently large area," by inserting the words, "unless creeping pressures (such as those encountered by the writer in his experiments) were exceeded.". From Wordnik.com. [Pressure, Resistance, and Stability of Earth American Society of Civil Engineers: Transactions, Paper No. 1174, Volume LXX, December 1910] Reference
In a flat arch the voussoirs are wedge-shaped, but the extrados and intrados are composed of straight lines. From Wordnik.com. [The Catholic Encyclopedia, Volume 1: Aachen-Assize] Reference
The rise of an arch is the height of the highest point of its intrados above the line of the impost; this point is sometimes called the underside of the crown, the highest point of the extrados being the crown. From Wordnik.com. [The Catholic Encyclopedia, Volume 1: Aachen-Assize] Reference
Page 248 over the arch; for she remembered distinctly having noticed a large and very beautiful golden butterfly which had fluttered in from the terrace, and was flitting over the glowing folds that fell from the carved intrados to the marble floor. From Wordnik.com. [St. Elmo. A Novel.] Reference
With their pommels cunningly affixed so that their points touched and interlaced, yet swung free, they lined the piers of the arch from base to span and all the graceful sweep of the intrados, a curtain of shimmering, trembling steel, barring the way to the Mystery beyond. From Wordnik.com. [The Bronze Bell] Reference
The silk curtains, she was sure, were hanging over the arch; for she remembered distinctly having noticed a large and very beautiful golden butterfly which had fluttered in from the terrace, and was flitting over the glowing folds that fell from the carved intrados to the marble floor. From Wordnik.com. [St. Elmo] Reference
It consists of five parts: (1) Six concrete piers running the full width of the bridge upon which the structure was moved; (2) a steel framework up to E G, called the "primary bent"; (3) a separate timber portion below the heavy lines E I and W 'I'; (4) the "main staging" included in the trapezoid E I W 'I', and (5) the "upper trestle" extending from I I 'to the intrados. From Wordnik.com. [Concrete Construction Methods and Costs] Reference
Define the intrados and extrados of an arch. From Wordnik.com. [Scientific American Supplement, No. 561, October 2, 1886] Reference
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