Determining the structural performance of the concrete and masonry shafts in a historic waterway

Determining the seismic performance level of shaft structures is crucial due to their vital role in ensuring a water supply. Since these are underground structures, the loads they encounter and the structural modeling processes differ significantly from those of above-ground structures. Accordingly, the primary aim of this paper is to introduce a new modeling methodology for the seismic performance assessment of shaft structures, considering all relevant parameters. This unique approach also incorporates pertinent sections from various applicable local seismic codes. For this purpose, a total of 15 shaft structures located on the historic Atik Valide Waterway, constructed in 1583, were examined. To create numerical models of the shafts, soil exploration parameters were utilized, and the shaft surface-soil interaction was represented by nonlinear p-y springs. An integral part of the presented methodology involved segmenting the shafts at regular intervals, with each segment defined as a separate story. The analysis results demonstrated that the modeling methodology is accurate and aligns well with the observed conditions of the shafts. Considering the significant risk of extensive damage to sewerage systems in urban areas due to soil liquefaction during seismic events, this study is anticipated to serve as a valuable reference in the literature by introducing a new, accurate methodology for identifying potential seismic risks. • This paper focuses seismic performance analyses for the shafts of a waterway. • In the study, the assessment/design approach was established as Strength-Based Design (SBD). • The typical target performance of Controlled Damage was considered for Earthquake Ground Motion Levels DD-2 and DD-3.