NEHRP Clearinghouse

Cumulative Seismic Damage of Reinforced Concrete Bridge Piers.
Kunnath, S. K.; El-Bahy, A.; Taylor, A.; Stone, W.
Federal Highway Administration, Washington, DC., September 2, 1997, 204 p.
Identifying Number(s)
This research endeavor is concerned primarily with load path and the effect of ductility on energy dissipation capacity. It is also concerned with identifying criteria for low-cycle fatigue and the role of confinement, as prescribed in modern codes, in altering flexural failure modes. Section 2 begins with an overview of past work on experimental investigations on the seismic response of bridge piers. Section 3 presents the analytical model of the bridge pier, calibration of the hystersis model used in the analyses, validation of the dynamic response of the scaled model specimen, and the process of generating the random displacement histories used in the second phase of the testing. The results of Phase I testing are summarized in Section 4. The second phase of testing, reported in Section 5, is devoted exclusively to random load tests. Various existing theories of damage are examined in Section 6. Relevant findings from the study and suggestions for additional work are discussed in seventh and final section.
; Earthquake damage; Ductility; Damage assessment; Energy dissipation; Earthquake engineering; Reinforcement (Structures); Dynamic response; Highway bridges; Seismic design; Hysteresis; Bridge piers; Failure modes; Reinforced concrete; Structural fatigue; Structural members; Displacement; Columns (Supports); Fatigue limit; Cyclic loads; Dynamic structural analysis