Sensitivity of probabilistic seismic assessment to ground motion record selection – running

The number of studies that use Incremental Dynamic Analysis (IDA) as a tool to evaluate the seismic performance of structures is rapidly increasing in recent years. IDA uses structural response to a predefined set of ground motion records to describe the performance of the structure at different seismic scenarios. One of the key components of the methodology is the ground motion record set that is used for nonlinear time history analyses.
The objective of this project is the analysis of the influence of the applied ground motion record set on the results of IDA and structural performance. Three approaches are compared: the record set recommended by the widely used FEMA P695 document; a record set selected based on a site and structure specific Conditional Mean Spectrum (CMS); and a record set based on a series of CMS that also take into account the influence of spectral shape.
The methodology is applied on a large set of steel-yield based dissipative structures. The structures are designed for European sites with various seismic intensity levels. The results will illustrate how the structural and site characteristics influence structural performance assessment and benefits of more accurate ground motion selection will be evaluated.
The project requires results from approximately 50,000 nonlinear dynamic analyses on finite element models of steel-yield based dissipative frames. With the application of OpenSEES, an open source finite element code, such a large number of analyses is only feasible using resources such as the BME HPC Cluster.

Project owner:
Dr. Zsarnóczay Ádám (Hidak és Szerkezetek Tanszék)
Hidak és Szerkezetek Tanszék (ÉMK-HSZ)

Prof. José Miguel Castro (FEUP)