A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Minimizing Construction Problems in Segmentally Precast Box Girder Bridges
The cantilever construction of the first segmental precast prestressed concrete box girder bridge in the United States has been completed on the John F. Kennedy Memorial Causeway, Corpus Christi, Texas. The segments were precast, transported to the site, and erected by the balanced cantilever method of post-tensioned construction, using epoxy resin as a jointing material. This report documents major steps in construction of such a structure with emphasis on detailing lessons learned during the construction which might facilitate or improve similar projects. Many of these are seemingly trivial or obvious, but they were not necessarily such when first encountered. Suggestions involving design and detailing to improve constructability are made based on the Corpus Christi bridge experience. Similarly, recommendations for various steps and procedures in fabrication, casting, erection, and closure are made. An extensive summary is provided of an explanatory investigation of the cause of, and suitable control measures for, web cracking which occurred in some of the units. Cracks similar to those noted in the prototype construction were reproduced in laboratory tests. Several crack prevention or control measures, such as extra stirrups, concentric spirals, and vertical post-tensioning are investigated. The model tests revealed that the cracking load could be increased to a level substantially above the design prestress forces.
Minimizing Construction Problems in Segmentally Precast Box Girder Bridges
The cantilever construction of the first segmental precast prestressed concrete box girder bridge in the United States has been completed on the John F. Kennedy Memorial Causeway, Corpus Christi, Texas. The segments were precast, transported to the site, and erected by the balanced cantilever method of post-tensioned construction, using epoxy resin as a jointing material. This report documents major steps in construction of such a structure with emphasis on detailing lessons learned during the construction which might facilitate or improve similar projects. Many of these are seemingly trivial or obvious, but they were not necessarily such when first encountered. Suggestions involving design and detailing to improve constructability are made based on the Corpus Christi bridge experience. Similarly, recommendations for various steps and procedures in fabrication, casting, erection, and closure are made. An extensive summary is provided of an explanatory investigation of the cause of, and suitable control measures for, web cracking which occurred in some of the units. Cracks similar to those noted in the prototype construction were reproduced in laboratory tests. Several crack prevention or control measures, such as extra stirrups, concentric spirals, and vertical post-tensioning are investigated. The model tests revealed that the cracking load could be increased to a level substantially above the design prestress forces.
Minimizing Construction Problems in Segmentally Precast Box Girder Bridges
J. E. Breen (author) / R. L. Cooper (author) / T. M. Gallaway (author)
1975
281 pages
Report
No indication
English
Long-term behavior of segmentally-erected prestressed concrete box-girder bridges
| British Library Online Contents | 2005