HYSTERESIS IN BRIDGE STRAND

The paper examines the response of a preloaded spiral strand, with its ends fixed against rotation, to variations in the axial load. The various layers of wires forming the strand have been modelled as a series of cylindrical orthotropic sheets whose (non-linear) elastic properties are determined using results from contact stress theory. The strand axial stiffness and its variation with size of axial load perturbation, i.e. degree of development of interwire slip, follow. The axial hysteresis values appropriate to fully bedded-in strands can then be obtained. The predictions of full-slip axial stiffness for a number of practical spiral strands are supported by experimental results, while a comparison between the theory and some earlier carefully conducted damping measurements on a long and fully bedded-in 39 mm od strand is very encouraging. Theoretical hysteresis predictions are made for a number of practical strand constructions. The variation in fully bedded-in axial damping between strand constructions is shown to be considerable, while long-term cable damping is very unlikely to be as large as has been assumed on the basis of low-cycle tests on newly manufactured spiral strand. (Author/TRRL)

• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • HOBBS, R E
  • Raoof, M
• Conference:
  • Institution of Civil Engineers, Proceedings, Pt2
• Publication Date: 1984-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 445-464
• Serial:
  • Volume: 77

Subject/Index Terms

• TRT Terms: Axial loads; Bridges; Cable stayed bridges; Cables; Damping (Physics); Energy; Forecasting; Friction; Hysteresis; Loads; Mathematical analysis; Mechanical elasticity; Stiffness; Suspension bridges
• Uncontrolled Terms: Axial
• Old TRIS Terms: Axial stiffness
• ITRD Terms: 6471: Analysis (math); 6405: Axis; 4530: Cable; 5559: Damping; 213: Energy; 5452: Friction; 5449: Hysteresis; 5567: Load; 5931: Stiffness; 3476: Suspension bridge
• Subject Areas: Bridges and other structures; Energy; Highways;

Filing Info

• Accession Number: 00396211
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jan 31 1986 12:00AM