AHST 1100 Lecture Notes - Lecture 2: Neutral Axis, Cella, Ancient Greek Architecture
13 Dec 2014
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Trabeate system: post & beam, beam spans columns unsupported distance between columns = span. **beam spanning: at top resists compression, bottom resists tension, middle ( neutral axis ) separates the two. The arch counteracts compression & tension, let romans go bigger and more elaborate. Aqueducts allowed for growth, water (ex: pont du gard!) Gravity load pushes straight down, lateral force goes sideways. As long as lateral thrusts are dealt with, arches can be as big as you want. Each stone sloped to be placed under compression. Keystone placed last, makes the arch a load bearer vs. a burden once placed, support walls can be removed. Scaffolding used to support arch until keystone is placed. Barrel vault can now place windows in vaults. Groin vault precursor to dome (basically an arch in all directions) Larger cella, comes in contact with peristyle engaged columns . Can only approach from front, free-standing columns only by entrance.
