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http://dx.doi.org/10.12989/sem.2005.21.4.375

Load deformation characteristics of shallow suspension footbridge with reverse profiled pre-tensioned cables  

Huang, Ming-Hui (School of Urban Development, Queensland University of Technology)
Thambiratnam, David P. (School of Urban Development, Queensland University of Technology)
Perera, Nimal J. (Bird & Marshall Ltd.)
Publication Information
Structural Engineering and Mechanics / v.21, no.4, 2005 , pp. 375-392 More about this Journal
Abstract
Cable supported structures offer an elegant and economical solution for bridging over long spans with resultant low material content and ease of construction. In this paper, a model of shallow cable supported footbridge with reverse profiled pre-tensioned cables is treated and its load deformation characteristics under different quasi-static loads are investigated. Effects of important parameters such as cable sag and pre-tension are also studied. Numerical results performed on a 3D model show that structural stiffness of this bridge (model) depends not only on the cable sag and cross sectional areas of the cables, but also on the pre-tension in the reverse profiled cables. The tension in the top supporting cables can be adjusted to a high level by the pre-tension in the reverse profiled bottom cables, with the total horizontal force in the bridge structure remaining reasonably constant. It is also evident that pre-tensioned horizontally profiled cables can greatly increase the lateral horizontal stiffness and suppress the lateral horizontal deflection induced by eccentric vertical loads.
Keywords
suspension footbridge; structural stiffness; parameter study; reverse profile; pre-tension;
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