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Articulated and continuous cantilever bridges after a century of experience
Published in Nigel Powers, Dan M. Frangopol, Riadh Al-Mahaidi, Colin Caprani, Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2018
In these structures, the joints must transmit high-intensity forces from the cantilever to the suspended structure, while also allow suitable relative movements between the coupled structures. These forces are localized over small areas, resulting in highly concentrated stresses. For iron and steel bridges, it was natural to resorts to devices like those used for heavy mechanical machinery. Bearing and expansion supports, rollers, rockers, and sliders are mechanical devices, involving special manufacturing techniques (Fig. 7). The main body of the supports are cast and then worked with a milling cutter, lathe, and borer machines and, in the end, the working surfaces are hardened with chemical and thermal treatments.
Suspension Bridges
Published in Wai-Fah Chen, Lian Duan, Bridge Engineering Handbook, 2019
Atsushi Okukawa, Shuichi Suzuki, Ikuo Harazaki
Suspension bridge tower supports the main cable and the suspended structure. Controlling erection accuracy to ensure that the tower shafts are perpendicular is particularly important. During construction, because the tower is cantilevered and thus easily vibrates due to wind, countermeasures for vibration are necessary. Recent examples taken from constructing steel towers of the Akashi Kaikyo Bridge and concrete towers of the Tsing Ma Bridge are described below.
Tall buildings
Published in Hassan K. Al Nageim, T.J. MacGinley, Steel Structures, 2017
Hassan K. Al Nageim, T.J. MacGinley
The following alternative designs are possible: steel core with cantilever floor beams;suspended structure – perimeter hangers with concrete core and four umbrella girders (Figure 11.11).
Eminent Structural Engineer: Roger A. Dorton (1929–2020) Achieving and Inspiring Bridge Engineering Excellence in the Public and Private Sectors
Published in Structural Engineering International, 2022
In 1965, Roger won a nationwide competition to design 19 pedestrian bridges for Expo 67 in Montreal, a “Category One” world fair and the focal point for Canada’s 100th birthday celebrations, preparing his entry in his spare time at home. The associated design and construction supervision work gave him the opportunity to advance in Pratley’s son Hugh’s firm to form Pratley and Dorton, Consulting Engineers. He soon became the lead designer for the A. Murray MacKay suspension bridge, with a main span of 427 m, across the Narrows at Halifax, Nova Scotia (Fig. 3). Roger regarded this bridge, the first suspension bridge in North America with an orthotropic steel deck, as the one that gave him his greatest fulfilment. This was also the first suspension bridge to be aerodynamically tested in turbulent flow, including the staging of suspended structure erection, at Alan Davenport’s innovative Boundary Layer Wind Tunnel Laboratory.