groined arch

groin arch, groined arch

One arched division of cross vaulting.
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But, as I stood under the blackened, groined arches of that old synagogue, made dimly visible by the seven thin candles in the sacred lamp, while our Jewish cicerone reached down the Book of the Law, and read to us in its ancient tongue--I felt a shuddering impression that this strange building, with its shrunken lights, this surviving withered remnant of medieval Judaism, was of a piece with my vision.
As constructed, it is about 1,035 ft long by 550 ft wide and 40 ft high from the floor to the crown of the groined arch roof.
diameter concrete columns are spaced at 20 ft 3-1/2 in., supporting the non-reinforced groined arch roof with a height of 5 ft above the springing line, a cantilevered clear span of 8 ft 10-3/4 in., and a minimum 6 in.
Also, as a membrane, the dimensions of the perimeter barrel arch were selected to resist the groined arch thrust, the weight of overlying soil, the weight of the barrel arches, and live loads.
These cracks occurred both in the perimeter barrel arch sections and in adjacent sections of the groined arches. These roof distress patterns were confined to the perimeter bay of the barrel arch and the exterior half of the first interior groined arch.
In the meantime, a finite element computer analysis of one groined arch unit (one column with four supported groined arches) was made to evaluate the true distribution of horizontal forces.
The distress of the barrel arch and the adjacent groined arch, are shown on Figure 2.
The crown joint and the groined arch hinge cracks though, exhibited both rotational and translational displacements.
The reservoir structure as shown in Figure 1 consists of perimeter retaining walls, a dividing wall, reinforced concrete columns, and a plain concrete roof of groined arches. The tapered dividing wall varies in thickness from 4 ft at the top to 8 ft at the base.
"Membrane assumptions" were used by the original engineers in the design of the groined arches. This stress analysis method assumes that there is no flexure, only compressive stresses; that is, no bending stresses are developed on the arched roof structure from dead and live loads.
'But, as I stood under the blackened, groined arches of that old synagogue, made dimly visible by the seven thin candles in the sacred lamp, while our Jewish cicerone reached down the Book of the Law and read to us in its ancient tongue--I felt a shuddering impression that this strange building, with its shrunken lights, this surviving withered remnant of med ieval Judaism, was of a piece with my vision.