Bridges, Tunnels and other Transportation Structures
Full Session with Abstracts
Accelerated Bridge Construction (ABC) is a method of bridge construction designed to reduce traffic interruption and minimize on-site construction time. The use of precast elements is gaining attention owing to inherent benefits of accelerated construction. Designing an economical connection with reasonable structural behavior is the main concern for these structures. New improved materials such as Ultra High Performance Concrete (UHPC) with superior characteristics can provide solutions for joining precast concrete elements.
In this presentation, two types of column to cap beam connection using UHPC are proposed for seismic and non-seismic regions. Among the merits of the proposed detail are large tolerances in construction and simplicity of connection, which facilitates and accelerates the on-site construction time.
The experimental program was carried out to evaluate the performance and structural behavior of the proposed connection. Four specimens were subjected to cyclic loading to study the effect of the axial load and stirrup spacing in the plastic hinge and splice region. Experimental results show an acceptable behavior of the proposed detail and the displacement ductility of the specimens exceed those suggested by design provisions. Observations show that the major damages were limited to desired location in the column and UHPC can prevent development and propagation of the plastic hinge into the cap beam. Analytical and nonlinear finite element analyses on the proposed detail were conducted to develop a design guideline of the connection for the upcoming phases of the study. The numerical results were generally in good agreement with the experimental observation.