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A performance-based seismic design of quay walls in a new port in the north of Turkey is described in this paper. The project site lies in the north of Turkey at the Black Sea coast. The quay walls have a total length of near 3000 m and variable quay retaining heights, ranging from 14 to 22 m. Following the national (Turkish) code, a controlled performance level (repairable) was specified in the design approach. Non-linear seismic analyses were executed with two-dimensional FEM models for an earthquake scenario of 10% probability of exceedance in 50 years. The hardening soil small-strain (HSS) constitutive model was used since it has the capability to reproduce the steady change in stiffness with strain, incorporating hysteretic damping. Representative strong motions were selected, filtered and scaled, and eventually implemented in the FEM models, according to the project needs. The adequacy of the models was analyzed with a theoretical solution. For the particular geotechnical and seismic conditions of this project, it was found that for a 5% damping the seismic response was accurately modeled for the frequency range below 4 Hz. Higher frequencies were underdamped. The dynamic analysis with the FEM models resulted in a more economic and optimal design, in comparison to a pseudo-static approach.
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