- An Analytical Study for Design of Long-Span Prestressed Concrete Bridge I-Girder
- Sim, Jong-Sung ; Bae, In-Hwan ; Kim, Jung-Ku ;
- Journal of The Korean Society of Civil Engineers, volume 19, issue 1_4, 1999, Pages 581~581
Abstract
The purpose of this study is to analyze effects of design parameters on nonlinear flexural behavior of long-span prestressed concrete bridge I-girder (PSC I-girder). In this study, a nonlinear layered model which can consider nonlinear material properties of high strength concrete, rebar, and PS tendon is developed using the strain compatibility method. The stress-strain distribution considering tensile strain softening for high-strength concrete is assumed and bilinear elastic-plastic model for the reinforcement is applied; the Mattock's model for PS tendon is used. A reasonable agreement between the experimental results and the predictions is obtained. Using this model, the study on the design parameters such as the type of cross-section, the compressive strength of concrete, and the reinforcement ratio is performed. From the analytical results, the bulb tee type of section having high section modulus is more effective than other types for long span. The applied compressive strength of concrete has not effects on ultimate load and flexural rigidity, but on ductility of the member. The use of the compression and tension reinforcements increases ductility and ultimate loads of PSC member.