Stress-Ribbon Pedestrian Bridges Supported by Arches

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Stress-Ribbon Pedestrian Bridges Supported by Arches Powered By Docstoc
					                                               Completed in 2007, this
                                                 self-anchored stress-
                                           ribbon structure supported
                                           
				
DOCUMENT INFO
Description: Because there are no bearings or expansion joints, the bridges require only minimal long-term maintenance.1 The economy of the stress-ribbon structures can be increased by a combining the slender concrete deck with suspension cables.1 Problems connected with the design and construction of the stress-ribbon structures and a survey of such bridges built all over the world has been presented elsewhere.2 A disadvantage of the classical stress-ribbon structure is the need to resist very large horizontal forces at the abutments-a requirement that affects the economy of stress-ribbon systems. After the forces in the external cables were adjusted, the joints between the segments were cast and, subsequently, the external tendons were tensioned up to the design stress. Because the cables are curved, the radial forces loaded the stress ribbon, prestressing the deck.
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