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Factors Affecting Structural Behavior of Suspension Cables Nets
Light weight cable nets have been successfully used for spanning over very long spans, by using thin layers of steel cables. Under snow and wind loads, the nets are subjected to large deflections and both the static and dynamic behaviors are governed by the unusually high span to thickness ratios. It is therefore important that the deflections and forces in the net are controlled, by a careful selection of the design parameters, such as direction and magnitude of prestressing forces. Most nets utilize unidirectional post-tensioning of cables, which results in heavy anchorages and uneconomical supporting frames. A biaxial post-tensioning system will minimize the magnitudes of prestressing, the cable sizes, the reactions at anchorages and the use of lighter supporting frames and foundations would be possible. A rectangular net pattern will lead to a more efficient system than a skew pattern. Other important parameters are the spacing of cables, varying prestressing forces in the two directions, providing a composite cable and deck sheeting model (increasing planar stiffness of cladding), considering the effects of yielding supports under prestress due to anchor movement and the increase in axial stiffness due to closely spaced clamps. Also, results from an experimental study are discussed. Applications of current design code provisions (ASCE Cable Structural Standards-19, 1996) will lead to cost savings and improved structural performance.
Factors Affecting Structural Behavior of Suspension Cables Nets
Light weight cable nets have been successfully used for spanning over very long spans, by using thin layers of steel cables. Under snow and wind loads, the nets are subjected to large deflections and both the static and dynamic behaviors are governed by the unusually high span to thickness ratios. It is therefore important that the deflections and forces in the net are controlled, by a careful selection of the design parameters, such as direction and magnitude of prestressing forces. Most nets utilize unidirectional post-tensioning of cables, which results in heavy anchorages and uneconomical supporting frames. A biaxial post-tensioning system will minimize the magnitudes of prestressing, the cable sizes, the reactions at anchorages and the use of lighter supporting frames and foundations would be possible. A rectangular net pattern will lead to a more efficient system than a skew pattern. Other important parameters are the spacing of cables, varying prestressing forces in the two directions, providing a composite cable and deck sheeting model (increasing planar stiffness of cladding), considering the effects of yielding supports under prestress due to anchor movement and the increase in axial stiffness due to closely spaced clamps. Also, results from an experimental study are discussed. Applications of current design code provisions (ASCE Cable Structural Standards-19, 1996) will lead to cost savings and improved structural performance.
Factors Affecting Structural Behavior of Suspension Cables Nets
Khan, Mohiuddin A. (author)
Structures Congress 2005 ; 2005 ; New York, New York, United States
Structures Congress 2005 ; 1-10
2005-04-18
Conference paper
Electronic Resource
English
Factors Affecting Structural Behavior of Suspension Cable Nets
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