The term "fake architecture" gives 640 Google hits.

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Note added at 21 mins (2009-04-03 17:37:13 GMT)
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I am adding a quotation.
"Walk under the fake sky, that turns day into nite so gradually natured, even the fake architecture is so impressive and real looking..."
http://members.virtualtourist.com/m/tt/18324/

I believe this is the term you are looking for, it has over 2,000,000 hits on Google

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Questo concetto si riferisce sia alla pittura ed agli affreschi, che alla letteratura:
http://comunicatistampa.wordpress.com/2006/12/07/oggi-eventi...

http://www.google.it/search?hl=it&q="fictive architecture"&b...

http://books.google.it/books?id=Ob_NFt2io-MC&pg=PA183&lpg=PA...
"And there had been what is called fictive architecture-the painted imitation of columns, pilasters, vaults and the like....."

http://books.google.it/books?id=KrVdhw_jvE4C&pg=PA136&lpg=PA...

http://www.psupress.org/justataste/samplechapters/justataste...
As Trachtenberg has pointed out, the degree to which Giotto created a complex structure of fictive architecture and material is remarkable. The fictive dentil course, marble dado, and base at the viewer's level, no less than the framing of the scenes, signals the idea of different levels of reality (fig. 4). The various classes of images, the fictive architecture, and the fictive materials are manifestations of multiple levels of illusion, and thus of meaning, indicated to the spectator from the very beginning, on the lowest level of the space.






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Note added at 2 hrs (2009-04-03 20:07:25 GMT)
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Da come la leggo io i "trompe-l'oeil" sono solo degli elementi che aitutano a formare l'insieme di quello che viene chiamato "fictive architecture".
http://www.scottishcastlesassociation.com/newsltr/no4/page17...
The walls were decorated throughout in trompe-l'oeil resembling stone and decorative brickwork. There are fictive vaults, corbel tables, columns and windows. There are angels in "niches", dado rails, and Gothic rib vaults forming part of the fictive architecture. The decorative scheme is truly remarkable, given the paucity of materials available.


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Note added at 2 hrs (2009-04-03 20:14:56 GMT)
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http://www.scribd.com/doc/13410642/renaissance-art

http://www.faqs.org/theories/Hy-Im/Illusionism.html
The use of pictorial techniques such as perspective and foreshortening to deceive the eye into believing that what is painted is real.

Popular in the Hellenistic period, especially in the painted fictive architecture at Pompeii, the technique was revived by Italian painter Andrea Mantegna (1431–1506) in his ceiling for the Camera degli Sposi (1474) in Mantua



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Note added at 3 hrs (2009-04-03 20:20:58 GMT)
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http://www.crucifixion.com/visual/theology/johndixon/terror....
On the ceiling, Michelangelo used the fictive architecture to articulate the surface and thereby give a measure to the space; both advancing and receding space can be measured against the established level of the architecture, and the surface of the actual architecture is not denied. The space of the wall is not so direct. Since there is no fictive architecture, there is nothing to measure the advancing and receding against.

http://www.holycross.edu/departments/visarts/projects/anglia...


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Note added at 3 hrs (2009-04-03 20:25:25 GMT)
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http://www.wga.hu/frames-e.html?/html/g/ghirland/ridolfo/cap...
Cappella dei Priori
It is richly gilded and replete with all'antica grotesque decorations in an elaborate organization predicated on a combination of real and fictive architecture.
http://www.martayanlan.com/cgi-bin/display.cgi/Books/all/30/...
Under the right arch of the fictive architecture, two buildings appear. While three commedia dell'arte figures, who are commonly associated with the Venetian carnevale, appear, the carriage in the background contradicts the possibility that the setting for this event is Venice.

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Note added at 3 hrs (2009-04-03 20:27:46 GMT)
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http://en.wikipedia.org/wiki/Tornabuoni_Chapel

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Note added at 3 hrs (2009-04-03 20:28:19 GMT)
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E tanti altri esempi...ma forse è meglio che mi fermi ...;-)