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Evaluation of the Performance of Bridge Steel Pedestals under Seismic Loads
Over 50 bridges in Georgia have been elevated using steel pedestals as a cost-effective means to increase the clearance height and to reduce the likelihood of impact damage from over-height vehicles. Steel pedestals are W-shape members that resemble stub columns and transfer loads from the bridge deck to the substructure. While steel pedestals perform similar in function as bearings which have been vulnerable components in past earthquakes due to lack of deformation capacity and potential instability, steel pedestals may also prove to be vulnerable components for similar reasons. To evaluate the behavior of steel pedestals, an experimental study is conducted and the results from 33 1/2" tall steel pedestals are compared to past experimental studies that showed the results of cyclic quasi-static loading on 19" short steel pedestals. The experimental test setup consists of a full-scale two-beam 40' span bridge system with steel pedestals subjected to low level (cyclic quasi-static) and high level (peak) loads. Results from the experimental testing are presented in terms of load-deflection hysteretic behavior and effective stiffness exhibited by the system. Different configurations for the post-installed anchor bolt connection elements to the reinforced concrete pier cap are tested and compared. Future analytical studies will use a bridge model to reveal the most vulnerable aspects of steel pedestals and provide recommendations for appropriate connection details for ensuring adequate seismic performance.
Evaluation of the Performance of Bridge Steel Pedestals under Seismic Loads
Over 50 bridges in Georgia have been elevated using steel pedestals as a cost-effective means to increase the clearance height and to reduce the likelihood of impact damage from over-height vehicles. Steel pedestals are W-shape members that resemble stub columns and transfer loads from the bridge deck to the substructure. While steel pedestals perform similar in function as bearings which have been vulnerable components in past earthquakes due to lack of deformation capacity and potential instability, steel pedestals may also prove to be vulnerable components for similar reasons. To evaluate the behavior of steel pedestals, an experimental study is conducted and the results from 33 1/2" tall steel pedestals are compared to past experimental studies that showed the results of cyclic quasi-static loading on 19" short steel pedestals. The experimental test setup consists of a full-scale two-beam 40' span bridge system with steel pedestals subjected to low level (cyclic quasi-static) and high level (peak) loads. Results from the experimental testing are presented in terms of load-deflection hysteretic behavior and effective stiffness exhibited by the system. Different configurations for the post-installed anchor bolt connection elements to the reinforced concrete pier cap are tested and compared. Future analytical studies will use a bridge model to reveal the most vulnerable aspects of steel pedestals and provide recommendations for appropriate connection details for ensuring adequate seismic performance.
Evaluation of the Performance of Bridge Steel Pedestals under Seismic Loads
Hite, Monique C. (author) / DesRoches, Reginald (author) / Leon, Roberto (author)
Structures Congress 2006 ; 2006 ; St. Louis, Missouri, United States
Structures Congress 2006 ; 1-10
2006-10-10
Conference paper
Electronic Resource
English
Evaluation of the Performance of Bridge Steel Pedestals under Seismic Loads
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