The abutment towers are similar to the river towers.
Each chain over a shore span consists of two segments, the longer attached to the tie at the top of the river tower, the shorter to the link at the top of the abutment tower, and the two jointed together at the lowest point.
On the abutment towers the chains are connected by horizontal links, carried on rockers, to anchor ties.
When arches form the superstructure, the abutment must be so designed as to transmit the resultant thrust to the foundation in a safe direction, and so distributed that no part may be unduly compressed.
The methods of erection may be classed as - (I) erection on staging or falsework; (2) floating to the site and raising; (3) rolling out from one abutment; (4) building out member by member, the completed part forming the stage from which additions are handled.
That at the left abutment is R 1 =W 1+ W 2+ ...-R2.
48), at distances x and x+a from the left abutment, be their resultants on either side of C. Then the reaction at B is WIx/1+W2(x+a)/l.
55) be the distance of the load from D', x 1 the distance of D' from the left abutment, and p the length of a bay.
From the left abutment, being the ordinates of the influence curve under the loads, is S = Piyl+P2y2+
56) represent in magnitude and position a load W, at x from the left abutment, on a girder AB of span 1.
From the abutment of the Hindu Kush on the Sarikol in the Pamir regions to Landi Kotal, and throughout its eastern and southern limits, the boundary of Afghanistan touches districts which were brought under British political control with the formation of the North-West Frontier Provinces of India in 1901.
Wedged in between the railway and the Indus, but still north of the railway, is a curious mass of rough mountain country, which forms the southern abutment of the Suliman system.
We can now Indianrs - fully appreciate the factor in practical politics which Afghan- that definite but somewhat irregular mountain system, represents which connects the water-divide north of istan Herat with the southern abutment of the Hindu Kush, near Bamian.
In finding the abutment reactions some principle such as the principle of least action must be used, and some assumptions of doubtful validity made.
Eads, the engineer, determined to establish the piers and abutments on rock at a depth for the east pier and east abutment of 136 ft.
For suspension bridges the abutment forming the anchorage must be so designed as to be thoroughly stable under the greatest pull which the chains can exert.
The reaction at the right abutment is R4 = W1x1/l+W2x2/lrt ..
Let the load move to D, so that its distance from the left abutment is x+a.
The principal measurements are: each abutment 176 ft.; from abutment to side tower, 230 ft.; from side tower to central tower, 460 ft.; breadth of each side tower at road-level, 32 ft.; breadth of centre tower, 45 ft.
Once it chanced that I stood in the very abutment of a rainbow's arch, which filled the lower stratum of the atmosphere, tinging the grass and leaves around, and dazzling me as if I looked through colored crystal.
Above Trinity high-water mark; the arches on each side of the centre have a span of 140 ft., and the abutment arches 130 ft.