Key vulnerability parameters for steel pipe pile-supported wharves considering the uncertainties in structural design

Identifying the key vulnerability parameters (KVPs) of a structure is essential for vulnerability analysis. This study proposes a procedure for selecting the KVPs of steel pipe pile-supported wharves (SPPSWs). Initially, the engineering demand parameters (EDPs) investigated were the initial stiffness, horizontal displacement of the pile head, and displacement ductility coefficient, based on pushover analysis. A comprehensive sensitivity analysis, including both local and global sensitivity analyses, was conducted to evaluate the potential KVPs' effects on different EDPs, taking into account uncertainties in structural design and geotechnical parameters. Finally, three KVPs were selected based on the results of the top-ranked parameters: axial compression ratio, pile diameter, and free length of the landward pile. This study also indicates that the displacement ductility coefficient is the most suitable EDP for SPPSWs.