Testing and Long-Term Monitoring of 9th Street Bridge Over I-235 in Des Moines: Integral Abutments Supported on Steel Pile/Concrete Drilled Shaft in Glacial Clay

Project Details
STATUS

Completed

START DATE

04/15/06

END DATE

04/30/10

RESEARCH CENTERS InTrans, BEC, CTRE
SPONSORS

Iowa Department of Transportation

Researchers
Principal Investigator
Brent Phares

Bridge Research Engineer, BEC

Co-Principal Investigator
Terry Wipf

Faculty Affiliate

About the research

The 9th Street Bridge in Des Moines is the first bridge in Iowa that uses a unique integral abutment design. The integral abutments are supported on steel H-piles that are embedded into concrete drilled shafts, which are seated in glacial clay. This unique design was developed in an effort to address environemental concerns–namely vibrations from pile driving–while also providing a long-lasting stucture in the form of a jointless bridge. Although this innovative work is promising, it is unproven and will not become a common option unless adequate testing and monitoring are performed to validate design and behavior assumptions. A total of three pile/shaft elements will be instrumented and monitored over a minimum two-year period.

 

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