A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of Design Specifications and Commentary for Horizontally Curved Concrete Box-Girder Bridges. National Cooperative Highway Research Program
At one time, bridges on curved alignments were rare; however, modern highway bridges and traffic separation structures are commonly built on a horizontal curve. This change has come about because of higher traffic volumes and speeds, the geometric constraints of the urban environment, and improved structural forms that lend themselves to curved construction. The concrete box-girder, particularly post-tensioned prestressed concrete that can span large distances, is one such structural form. The cross section of these structures is inherently strong in torsion. This is important because curvature induces high torsion forces. Also, because concrete can be easily molded into the required shape, it is ideal for curved construction. For these reasons, prestressed concrete boxgirders have become the structure type of choice in many jurisdictions. A common application of curved structures is in freeway interchanges where connector ramps or flyovers carry traffic from one freeway to another at relatively high speed. Cross sections of curved box-girders may consist of single-cell, multi-cell or spread box beams as shown in Figure 1-1. Because only a very few spread box beam bridges use curved beams, only the first two types were considered in this study.
Development of Design Specifications and Commentary for Horizontally Curved Concrete Box-Girder Bridges. National Cooperative Highway Research Program
At one time, bridges on curved alignments were rare; however, modern highway bridges and traffic separation structures are commonly built on a horizontal curve. This change has come about because of higher traffic volumes and speeds, the geometric constraints of the urban environment, and improved structural forms that lend themselves to curved construction. The concrete box-girder, particularly post-tensioned prestressed concrete that can span large distances, is one such structural form. The cross section of these structures is inherently strong in torsion. This is important because curvature induces high torsion forces. Also, because concrete can be easily molded into the required shape, it is ideal for curved construction. For these reasons, prestressed concrete boxgirders have become the structure type of choice in many jurisdictions. A common application of curved structures is in freeway interchanges where connector ramps or flyovers carry traffic from one freeway to another at relatively high speed. Cross sections of curved box-girders may consist of single-cell, multi-cell or spread box beams as shown in Figure 1-1. Because only a very few spread box beam bridges use curved beams, only the first two types were considered in this study.
Development of Design Specifications and Commentary for Horizontally Curved Concrete Box-Girder Bridges. National Cooperative Highway Research Program
2008
97 pages
Report
No indication
English
Analytical Modeling of Horizontally Curved Steel Girder Highway Bridges for Seismic Analysis
| Taylor & Francis Verlag | 2015