RESULTS OF WIND TUNNEL MODEL TESTS AND FIELD OBSERVATIONS OF WIND EFFECTS ON THE ONOMICHI BRIDGE

THE ONOMICHI BRIDGE, WHICH IS LOCATED IN THE SETO-INLAND SEA AND SPANS A SOUND OF ABOUT 200 METERS, IS A CABLE-STAYED CONTINUOUS-GIRDER BRIDGE OF 215-METER CENTER SPAN AND 85-METER TWO SIDE SPANS. THE CONTINUOUS BRIDGE GIRDER CONSISTS OF TWO PLATE GIRDERS 3.2 METERS HIGH AND STEEL PLATE DECK 10.4 METERS WIDE. EARLIER MODEL TESTS WERE CARRIED OUT ON SECTION MODELS OF 1/25.6 SCALE SUSPENDED BY COIL SPRINGS WHICH ALLOWED VERTICAL AND/OR PITCHING MOTION BY WHICH THE AERODYNAMIC INSTABILITY OF THE BRIDGE IN THE OVERALL RANGE OF WIND VELOCITY COULD BE STUDIED. THE TESTS REPORTED HERE WERE DIRECTED TO THE CAUSE OF RESTRICTED VIBRATION FOUND BOTH IN THE EARLIER TESTS AND IN OBSERVATION OF THE BRIDGE. A SECTION MODEL OF 1/365 SCALE WAS AT FIRST SUSPENDED BY COIL SPRINGS AND THEN SET IN AN INSTALLATION THAT MEASURED THE UNSTEADY AERODYNAMIC FORCES ACTING ON THE MODEL. THE RESTRICTED VIBRATION FOUND IN THE MODEL TEST HAS BEEN CONFIRMED BY THE OBSERVATION OF THE COMPLETED BRIDGE, BUT THE VIBRATORY AMPLITUDE AND THE RANGE OF WIND VELOCITY OBTAINED BY THE TEST DIFFERED FROM THOSE OBSERVED ON THE PROTOTYPE. IT IS CONCLUDED THAT THE RESTRICTED VIBRATION WILL CAUSE NO TROUBLE TO THE TRAFFIC.

• Corporate Authors:

  Public Works Res Inst, Cm /Japan

  ,    
• Authors:
  • Okubo, T
  • Enami, Y
• Publication Date: 1972

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 249-60
• Serial:
  • Publication of: Precast Concrete /UK/
  • Volume: 14
  • Publisher: Precast Concrete /UK

Subject/Index Terms

• TRT Terms: Bridges; Cable stayed bridges; Girder bridges; Prototype tests; Vibration; Wind; Wind tunnels
• Uncontrolled Terms: Model tests
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209853
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 19 1973 12:00AM