Seismic Design of Deep Bridge Pier Foundations in Frozen Ground

Abstract and project information last updated: 1 March 2011. Project updates are dated below.

AUTC
Project
Number
107033
Principal
Investigator
Sri Sritharan (ISU)
sri@iastate.edu
Funding
Agency

US Department of Transportation (RITA)

Alaska Department of Transportation & Public Facilities

Project
Budget
220000
Start
Date
3 August 2007
Estimated
End Date
31 March 2011

Abstract

This project developed design methods for drilled shaft foundations customized for Alaska’s bridges, soils, and temperatures. Researchers tested how reinforcing steel, concrete, and soil behaved under cold conditions. They demonstrated cold-temperature effects on moment-curvature behavior of reinforced concrete and soil-foundation-structure interaction; established setup procedures for performing material tests at cold temperatures; discovered that temperature effects on stress-strain behavior of A706 steel reinforcement cause different behavior from that published in literature for similar reinforcement or structural steel; discovered the inadequacy of the existing method proposed for seismic design of drilled shafts (especially in cohesive soil); and developed more rational design methodology for drilled shafts in cohesive soil. The research team also prepared a review of state-ofthe-art seismic design of drilled shafts. Its findings will be used to establish a new design methodology tailored to seismic regions subjected to seasonal freezing.

Related Project Activity

27 July 2009

Results Presented on Cold Steel Research

by Joel Bailey

Jared Levings and Sri Sritharan presented thier research results on “Testing of ASTM A706 Mild Steel at Low Temperatures”. Their slide presentation is available at: ISU_Steel_reinforcement_test_results.pdf