Building Construction
Transcript: STRUCTURAL CHARACTERISTICS The strength of a suspended structure is derived from the parabolic form of the sagging high-strength cable. Keywords Arch, arch bridge, steel bridge, special structures Summary: The City of Tianjin is currently implementing a Haihe River Area redevelopment plan to revitalize the downtown area. The Dagu Bridge is located right in the center of the entire redevelopment area and is one of the first projects in this redevelopment plan. The city of Tianjin asked for a bridge that can be a new symbol of the city. The final design is a double arch that compliments the surroundings. The bridge, with two arches, one larger and one smaller, is called the “Sun and Moon Bridges”. The site posts several severe geometric restrictions with respect to construction depth, maximum allowable vertical slope and navigation requirements. The final bridge scheme satisfies all those restrictions. Truss bridge is deemed aesthetically not acceptable. The cable-stayed bridge was also rejected for aesthetic reasons. Consequently, the final alternatives are self-anchored suspension bridges and tied-arch bridges. Finally, the tied-arch was selected based on its superior aesthetics. PROJECT HIGHLIGHTS Haihe’s navigation clearance Maximum vertical slope of 3.5% Low elevation at both ends of the bridge No pier in the river The soft soil at the riverbanks High seismic zone The 58,400m Dubai Creek Crossing Bridge is located in one of Dubai City’s most prominent waterfront location, an area where cultural importance is reflected in a unique mixture and blend between modern buildings and heritage quays. The bridge will provide pedestrian accessibility between the car park building and three proposed towers with a total GFA of 50,000m2, where it will provide pedestrian strip, travelator, and a path for a user-friendly electrical and the towers, fully air-conditioned with automated conveying system. The connection bridge is themed to give a complex and appropriate spots along the footpaths of Beniyas Road. It will also provide access for service and emergency vehicles as well as emergency escape through the existing service road along each quay. Power and mechanical plants will be incorporated within the towers and/or be part of the car parking building site. The design competition that is launched by Mizin JV with Dubai Municipality. Aedas was the Design Architect for this project. DUBAI CREEK CROSSING SIGNATURE BRIDGES,Dubai to James Finley Golden Gate Bridge,USA Vine Suspension Bridge Materials The steel structure of the bridge is clad in polished silver coloured metal sheets that are inspired by the oyster shell, a poignant symbol for Dubai and its famed history of pearl diving.The dynamic form of the infinity loop is accentuated by a patterned chord that weaves around the structure. The pattern is based on Islamic art and will be lit at night by a programmed lighting system.The design is technically suitable to the site, an important aspect of good design. AR 3310 Building Construction IV Cable Suspension 2002 March TYPICAL MATERIALS The horizontal surface is most commonly a steel structure because of its relative lightness, or a steel and concrete composite. the towers may be of either stone, concrete, or steel. The cables are steel. Locale San Francisco, California and Marin County, California Designer Joseph Strauss, Irving Morrow, and Charles Ellis Design Suspension, truss arch & truss causeways Material Steel Construction January 5, 1933 End April 19, 1937 begin Opened May 27, 1937; 74 years ago Connects San Francisco Peninsula with Marin County Longest span 4,200 ft (1,280.2 m). Height 746 ft (227.4 m) Width 90 ft (27.4 m) Total length 1.7 mi (2.7 km) or 8,981 ft (2,737.4 m) Background RULES OF THUMB DESIGN The tower height is usually about 1/9 of the span. Longest Spans: Golden Gate Bridge: 4200 feet = 1280 meters (built in San Francisco in 1937 by O.H. Ammann) Humber Estuary Bridge: 1410 meters (Germany) Dagu Bridges Tianjin China Roebling Bridge Pass DEFINITION Suspension structures are those with horizontal planes supported by cables hung from the parabolic sag of large, high-strength steel cables. Present