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network arch bridge
A Network Arch Bridge is a tied arch bridge with inclined hangers that cross each other at least twice.
==Structure==
The inclined hangers with multiple intersections make the network arch bridge act like a truss, with only axial compressive and tensile forces. Bending moments and shear forces are very small in network arches.
The hanger arrangement is what separates network tied arch structures from other types of tied arches, such as those with vertical hangers. It is defined by the number of hangers, hanger inclination and hanger distance. A radial hanger arrangement provides an efficient structure, as shown by Benjamin Brunn and Frank Schanack in 2003.〔Brunn B., Schanack F., Steimann U., (2004) “Network arches for railway brides”, Arch Bridges IV, Advances in Assessment, Structural Design and Construction, P. Roca y C. Molins (Eds.), ISBN 84-95999-63-3, pp. 671-680, Barcelona, Spanien〕 In the radial hanger arrangement the distances between the upper hanger nodes and the angle between hangers and arch remain constant. In order to avoid too long hangers this angle may be increased towards the bridge ends.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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