Bridges, Tunnels and other Transportation Structures
Full Session with Abstracts
Simple for Dead Load and Continuous for Live Load (SDCL) steel bridge system has proven to be economical for non-seismic application. The steel bridge system has been used by mean of conventional and accelerated construction methods of building bridges. This presentation concentrates on Accelerated Bridge Construction (ABC) application.
Until now the application of SDCL steel bridge system in high seismic areas has been limited, mainly because of the lack of appropriate details, suitable for high seismic areas. The focus of this work is to suggest such detail and using experimental test, verify its merits. The development of the detail is summarized and published elsewhere and is briefly described here, to avoid duplications.
The ABC application of SDCL steel bridge system has many advantages that includes enhanced service life, accelerated construction and lower inspection and maintenance costs as compared to conventional steel bridge systems. Complete advantages of SDCL system is described elsewhere.
The extension of SDCL steel bridge system to high seismic areas was initiated by conducting detail numerical analysis that assisted to comprehend types of forces that connection detail over middle piers, where girders are joined together, must resist in high seismic areas.
The end result was development of detail for connecting the girders over middle pier and making them integral with bridge columns. The next stage of the research, which this presentation is mainly focusing on, was component level testing of the proposed SDCL connection to find the ultimate limit states and verifying the numerical results and merits of the proposed detail in light of established seismic design provisions. A one-third scale of the connection, including part of a column, cap-beam, diaphragm and two girders of the prototype bridge, was constructed and tested to evaluate the connection between the substructure and superstructure. The developed connection behaved as designed and prevented damage and inelasticity to extend to the capacity protected elements, the cap-beam and superstructure. The column showed sufficient ductility during the cyclic test which indicated the connection will perform well under high levels of displacements and drift.