Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Restoration of Strength in Adjacent Prestressed Concrete Box Beams. Final Report
The research project is aimed at the development and implementation of methods to restore strength to deteriorated prestressed concrete box beams used in bridges built in the early 1950's. The literature survey disclosed various methods to restore strength in bridges, but none specifically applicable to adjacent box beams. Two external reinforcement repair schemes were developed and trial installations were made. Each included the removal of deteriorated concrete, placement of reinforcing bars or post-tensioned tendons and application of gunite to the soffit of the beam. In Scheme 1, epoxy-coated reinforcing bars were used. This procedure restores ultimate flexural capacity, but does not restore lost prestress. It is the least costly method. In Scheme 2, post-tensioned, epoxy-coated strand were used. This restores the full ultimate flexural capacity and most of the lost prestress, but may cause some relatively high tensile stresses on the tops of beams at their ends. Difficulties were encountered in installing the post-tensioned systems, but its performance was good.
Restoration of Strength in Adjacent Prestressed Concrete Box Beams. Final Report
The research project is aimed at the development and implementation of methods to restore strength to deteriorated prestressed concrete box beams used in bridges built in the early 1950's. The literature survey disclosed various methods to restore strength in bridges, but none specifically applicable to adjacent box beams. Two external reinforcement repair schemes were developed and trial installations were made. Each included the removal of deteriorated concrete, placement of reinforcing bars or post-tensioned tendons and application of gunite to the soffit of the beam. In Scheme 1, epoxy-coated reinforcing bars were used. This procedure restores ultimate flexural capacity, but does not restore lost prestress. It is the least costly method. In Scheme 2, post-tensioned, epoxy-coated strand were used. This restores the full ultimate flexural capacity and most of the lost prestress, but may cause some relatively high tensile stresses on the tops of beams at their ends. Difficulties were encountered in installing the post-tensioned systems, but its performance was good.
Restoration of Strength in Adjacent Prestressed Concrete Box Beams. Final Report
H. K. Preston (Autor:in) / A. E. N. Osborn (Autor:in) / C. E. Roach (Autor:in)
1987
133 pages
Report
Keine Angabe
Englisch