LONG-TERM DEFLECTION CONTROL IN CANTILEVER PRESTRESSED CONCRETE BRIDGES. I: CONTROL METHOD

Concrete creep and shrinkage can lead to excess long-term deflection in concrete members, particularly in prestressed concrete structures. A typical example is one of long-term vertical deflection of a segmentally constructed prestressed concrete bridge due to prestress loss. Excessive deflection reduces the service life of bridge structures as well as leads to poor riding quality for passengers. This paper introduces a new method that employs control tendons to adjust the prestress of a bridge system in a timely manner. Findings reveal that deflection control in a prestressed concrete bridge can be achieved via application of small tendon forces at proper intervals. The proposed deflection control method is also confirmed by experimental studies. This paper explains the concept behind the new procedure and control algorithm. Experimental verifications and numerical expressions are revealed in a companion piece.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Chiu, H-S
  • CHERN, J-C
  • Chang, K-C
• Publication Date: 1996-6

Language

• English

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 489-494
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 122
  • Issue Number: 6
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Algorithms; Concrete; Control devices; Creep; Deflection; Methodology; Prestressed concrete bridges; Shrinkage; Structural members; Time intervals
• Old TRIS Terms: Concrete creep; Concrete shrinkage; Control tendons
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete;

Filing Info

• Accession Number: 00726923
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 8 1996 12:00AM