Category: Events - Important (on right) Concrete Filled Steel Tube Bridge Pier Connections – An ABC Solution

June 16, 2016 1:00 pm

by Bijan Khaleghi, Ph.D., P.E., S.E., State Bridge Design Engineer, Washington State DOT; Dawn Lehman, Ph.D., Professor, University of Washington; and Charles Roeder, Ph.D., P.E., Professor, University of Washington

Webinar Documents

Description: ABC techniques with adequate seismic resistance have become a priority for many DOTs in regions of high seismicity. Concrete filled steel tube (CFT) columns offer an attractive ABC alternative to conventional reinforced concrete and structural steel construction in both seismic and non-seismic regions. While CFTs optimize the mechanical contributions of both the steel tube and concrete fill while increasing construction efficiency, to date their implementation has been limited mainly due to uncertain design expressions and reliable connections. A research program was undertaken at the University of Washington to develop design expressions and connections to use CFT columns in bridge systems. Two types of connections were investigated: column-to-foundation and integrated column-to-cap beam connections. This presentation describes the design expressions and connection details and their implementation in the field.

June 2016_Photo 1_Reinforced Concrete Filled Tubes_6

Reinforced concrete filled steel tubes

June 2016_Photo 2_CFT prior to installation_1

CFT prior to installation

June 2016_Photo 3_CFST construction sequence

CFT construction sequence

June 2016_Photo 4_Cold Water Creek redesign

Cold Water Creek re-design

June 2016_Photo 5_CFST pier_2-original

CFT in bridge