ridge rib การใช้

• Secondary arched diagonal ribs, called tiercerons, span from the springers to the transverse ridge ribs.
• The vault plan diagram of central bosses, and arched transverse ribs ( alternate horizontal lines ) span from the springers to the main longitudinal ridge rib.
• In this case, there is no ridge rib, and the lierne ribs are arranged to enclose a series of panels that extend the whole way along the centre of the choir roof, interacting with the large east window by reflecting the light from the smoothly arching surfaces.
• Each course also was given a slight rise in the centre, so as to increase its strength; this enabled the French masons to dispense with the intermediate rib, which was not introduced by them until the 15th century, and then more as a decorative than a constructive feature, as the domical form given to the French web rendered unnecessary the ridge rib, which, with some few exceptions, exists only in England.
• At an early period, in consequence of the great span of the vault and the very slight rise or curvature of the web, it was thought better to simplify the construction of the web by introducing intermediate ribs between the wall rib and the diagonal rib and between the diagonal and the transverse ribs; and in order to meet the thrust of these intermediate ribs a ridge rib was required, and the prolongation of this rib to the wall rib hid the junction of the web at the summit, which was not always very sightly, and constituted the ridge rib.
• At an early period, in consequence of the great span of the vault and the very slight rise or curvature of the web, it was thought better to simplify the construction of the web by introducing intermediate ribs between the wall rib and the diagonal rib and between the diagonal and the transverse ribs; and in order to meet the thrust of these intermediate ribs a ridge rib was required, and the prolongation of this rib to the wall rib hid the junction of the web at the summit, which was not always very sightly, and constituted the ridge rib.