Frame system of Gothic architecture
The innovation technical solution consisted of the following: arch stopped to lean on the solid walls of the building, a massive barrel vault replaced the ribbed openwork cross, the pressure of the vault is transmitted by the ribs and arches on pillars. The resulting horizontal stress is perceived by the flying buttresses and buttresses.
The flying buttresses of Strasbourg Cathedral
“The ribbed vault was much easier Romanesque: decreased and vertical pressure and horizontal stress. Ribbed arch of his heels rested on pillars-the foundations, not walls; the thrust of it was clearly identified and strictly localized, and the Builder, it was clear where and how this wall should be “redeemed”. In addition, the ribbed arch had known flexibility. Shrinkage of the soil, catastrophic for the Romanesque arches, was relatively safe. Finally, the ribbed arch had the advantage of being allowed to overlap the space of irregular shape”.
Thus, the construction is greatly simplified due to the redistribution of the loads. First bearing, thick wall turned into a simple lightweight “shell”, whose thickness is no longer affect the bearing capacity of the building. Of thick-walled building of the Cathedral turned into a thin, but “backed” around the perimeter of the reliable and elegant “props”.
In addition, Gothic has refused semicircular, normal arch, replacing it wherever possible Lancet. The use of Lancet arches arkiv allowed to reduce side thrust by directing a significant portion of the pressure right on the support — and the higher and zaostrene arch, the less it creates a lateral thrust on the walls and pillars. The massive arch was replaced by a ribbed vault, the ribs—ribs are diagonally crossed and took the load. The space between them was filled with simple separably is a lightweight masonry of brick or stone.