Seismic performance of a FRP encased concrete bridge pylon connection

Fiber reinforced polymer (FRP) composites provide immense advantages in the development of bridge structural components. In addition to their attractiveness due to light weight and tailorable performance attributes, they also provide significant advantages for use in seismic regions. This paper describes the results of tests conducted to validate their use as pylons for cable-stayed bridges. A full-scale test of one segment of the pylon was conducted to evaluate the ductile performance of the splice connection as a potential region for inelastic action. Results indicate that all requirements for a successful proof of concept test were met. The force capacity was significantly greater than the maximum force demand for the bridge and the displacement capacity was close to six times the displacement demand under required seismic levels. Furthermore, the strain levels in the composite shell were well below the materials allowables set based on damage tolerance requirements.