DAMPING CHARACTERISTICS OF COMPOSITE GIRDER

An experimental laboratory program was conducted to determine the damping characteristics of a composite girder at different strain levels and the effect of structural deterioration due to cyclic loading on these characteristics. The cyclic loading was imposed by means of a moving-mass closed-lop electrohydraulic actuator system. Five different methods were employed in the investigation to evaluate the equivalent linear viscous damping of the composite girder. The results show that strain level and structural deterioration have a considerable effect on the damping ratio. Initially, the damping ratio increased as the strain level increased. However, after the composite girder had incurred some structural deterioration, the damping ratio decreased as the strain level increased. All five of the different methods used to determine the damping ratio yield approximately the same value for the damping ratio and predict the same trends with regard to the strain level. /Author/

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Duffield, R C
  • Salane, H J
  • Olsen, A R
  • Wells, R R
• Publication Date: 1977-1

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 105-118
• Serial:
  • Journal of the Structural Division
  • Volume: 103
  • Issue Number: ST1
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Actuators; Composite materials; Damping (Physics); Deterioration; Girders; Repeated loads; Strain (Mechanics)
• Uncontrolled Terms: Strain rate
• Old TRIS Terms: Composite girders
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00148372
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 15 1977 12:00AM