TY - GEN
T1 - Influence of intermediate pier bearing type on integral abutment bridge seismic response
AU - Kozak, D. L.
AU - LaFave, J. M.
AU - Fahnestock, L. A.
N1 - Publisher Copyright:
© 2018 11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Due to the popularity of integral abutment bridges (IABs) in the United States, understanding their seismic behavior is a critical need. IABs are frequently used in the Midwestern state of Illinois, which includes regions of moderate to high seismicity in the southern part of the state due to its proximity to the New Madrid Seismic Zone. Illinois typically uses two types of bearings between the superstructure of a bridge and the intermediate pier caps - namely, elastomeric bearings and low-profile fixed bearings. In seat-type abutment bridges, at least one pier incorporates fixed bearings while the other piers and abutments use elastomeric bearings, which aid in creating a quasi-isolated seismic response of the superstructure. In IABs, the inherent fixity of the superstructure at both abutments leads to superstructure movement that is dependent on the type of bearings at the intermediate piers. This study investigates the seismic behavior of three- and four-span IABs typical to southern Illinois with either all elastomeric or all fixed bearings at the intermediate piers. The bridges are modeled in OpenSees and subjected to 1000-year return period earthquake ground motions appropriate for the region. This sensitivity study considering the use of elastomeric or fixed bearings in IABs provides new information on demands that are transmitted from the bridge superstructure into the bridge substructure, especially the piers and foundations.
AB - Due to the popularity of integral abutment bridges (IABs) in the United States, understanding their seismic behavior is a critical need. IABs are frequently used in the Midwestern state of Illinois, which includes regions of moderate to high seismicity in the southern part of the state due to its proximity to the New Madrid Seismic Zone. Illinois typically uses two types of bearings between the superstructure of a bridge and the intermediate pier caps - namely, elastomeric bearings and low-profile fixed bearings. In seat-type abutment bridges, at least one pier incorporates fixed bearings while the other piers and abutments use elastomeric bearings, which aid in creating a quasi-isolated seismic response of the superstructure. In IABs, the inherent fixity of the superstructure at both abutments leads to superstructure movement that is dependent on the type of bearings at the intermediate piers. This study investigates the seismic behavior of three- and four-span IABs typical to southern Illinois with either all elastomeric or all fixed bearings at the intermediate piers. The bridges are modeled in OpenSees and subjected to 1000-year return period earthquake ground motions appropriate for the region. This sensitivity study considering the use of elastomeric or fixed bearings in IABs provides new information on demands that are transmitted from the bridge superstructure into the bridge substructure, especially the piers and foundations.
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M3 - Conference contribution
AN - SCOPUS:85085484815
T3 - 11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy
SP - 2078
EP - 2081
BT - 11th National Conference on Earthquake Engineering 2018, NCEE 2018
PB - Earthquake Engineering Research Institute
T2 - 11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018
Y2 - 25 June 2018 through 29 June 2018
ER -