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A two tower cable-stayed design would require very deep tower footings, and a conventional two tower suspension bridge would additionally require a massive anchor to be built in deep bay mud. The curved nature of the approach and seismic safety criteria place additional constraints upon the design, which set many firsts for a SAS bridge.
The first, a 665 foot (203 m) half-wave mast was installed at radio station WABC's 50 kW transmitter at Wayne, New Jersey in 1931. [ 4 ] [ 5 ] During the 1930s it was found that the diamond shape of the Blaw-Knox tower had an unfavorable current distribution which increased the power emitted at high angles, causing multipath fading in the ...
275-foot galvanized steel, self-supporting tower manufactured by ROHN. ROHN Manufacturing was founded in 1948 by Dwight Rohn, who at the time was manager of the Peoria Airport. The first tower he built was for airport use. [1]
Terminological and listing criteria follow Council on Tall Buildings and Urban Habitat definitions. Guyed masts are differentiated from towers – the latter not featuring any guy wires or other support structures; and buildings are differentiated from towers – the former having at least 50% of occupiable floor space although both are self-supporting structures.
The load path of the self-anchored suspension (SAS) bridge converts vertical loads into tension forces in the main cables which are countered by compressive forces in the towers and deck. The system balances forces internally without external anchorage requirements, making it suitable for sites where large horizontal forces are difficult to anchor.
A guyed radio mast. A guyed mast is a tall thin vertical structure that depends on guy lines (diagonal tensioned cables attached to the ground or a base) for stability. The mast itself has the compressive strength to support its own weight, but does not have the shear strength to stand unsupported or bear loads.
The derrick tower can be a mast or a post with the bottom hinged at the base where all ropes meet. The top of the tower is secured with multiple reeved guys to position the top of the tower to the desired location by varying the length of the upper guy lines. The load is lifted using a pulley system connected to the top of the tower. [2]
Self-supporting tower 137 High wind KYA transmitter placed in service in 1937. Failure may have resulted from tower leg insulator replacement where all-thread rod was not long enough to fully engage securing nut. Caroline 558 and Radio Monique mast, aboard MV Ross Revenge, off English coast November 25, 1987: Lattice steel tower 92 Force 8 storm