Cosic M., Folic R., Folic B.: Fragility and Reliability Analyses of Soil – Pile – Bridge Pier Interaction, Facta Universitatis, Series: Architecture and Civil Engineering, Vol. 16, No. 1, 2018, pp. 93-111.


The purpose of this paper is to present the methodology for performance-based seismic evaluation of soil-pile-bridge pier interaction using the incremental nonlinear dynamic analysis (INDA). The system’s input signal is treated through the generated artificial accelerograms which were subsequently processed by soil layers and for the bedrock. The INDA analysis was post processed separately for the pier and for the pile, so that the constructed PGA=f(DR) curves are in the capacitive domain. For these curves the authors identified the performance levels, while the regression analyses were conducted based on the specific DR and PGA parameters. Fragility curves were constructed based on the solutions of regression analysis and the probability theory of log-normal distribution. Based on the results of fragility analysis, reliability curves were also constructed. The methodological procedure for seismic performance analysis presented in this study provides an integrated quantitative-qualitative consideration and evaluation of the complex soil-foundation-structure interaction (SFSI).


incremental nonlinear dynamic analysis, pile performance, fragility, reliability, artificial accelerograms