Earthquake-resistant Behavior of Pre-stressed Steel Beams and CFT Column Connections with X-shaped Dampers

Earthquake-resistant Behavior of Pre-stressed Steel Beams and CFT Column Connections with X-shaped Dampers

The structural system of post-tensioned pre-stressed steel beams with concrete filled tubular(CFT) columns has remarkable performance in strength, ductility, load-bearing capacity and construction duration. After the structure is experienced an earthquake, the beams and columns can return to their original location. However, behavior of beam-to-column connection is so complicated that it is not widely applied. For the beam-to-column connections of this structural system, a detailed design method was proposed in this research. This research established a mechanics model of the beam-to-column connection and performed a series of structural earthquake-resistant experiments. The research results proved that the beam-to-column connection has remarkable earthquake-resistant performance in strength, ductility, energy dissipation and self-centering ability. The structural system remained standing even when story drift reached 6% and plastic angular displacement of the beam-to-column connection reached 5%. It demonstrates that the earthquake-resistant performance of this beam-to-column connection exceeds the seismic code requirements for earthquake-resistant connections in Taiwan and U.S.