Cosic M., Folic B., Folic R., Simon S.: Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj, Structural Integrity and Life, Vol. 14, No. 1, 2014. pp. 17-28.

Abstract

Presented in this paper are the results of the analysis of seismic performances of an overpass founded on piles, in interaction with the soil, located over the E-75 Highway Novi Sad – Belgrade, as part of the Kovilj loop. Applied methods include: non-linear static push-over (NSPA) analysis, target displacement analysis, parametric target displacement analysis, vulnerability and reliability analysis. The overpass was modeled and taken into consideration for seismic effects along its transverse direction as a 2D planar model. Modeling of elastic-plastic deformation was performed using plastic hinges, whereas the development of non-linear deformation was considered using the incremental-iterative method. It was determined that the failure mechanism of the system occurred because of the plasticization of column ends, and it was maintained as such until the end of the non-linear analysis, along with the changes of performance states in plastic hinges. System vulnerability analysis has shown that up until the point where Sa=0.2g, nearly all levels of damage are initiated, however, already at values of Sa≈0.3g, significant damages to the overpass are expected along the transverse direction with the probability of P≈1. On the other hand, reliability analysis of the overpass shows that reliability of R>0 is achieved for Sa<0,23g for levels of significant damage and for lower ones. Based on the analysis performed in this research, decisions can be made about the necessary repair measures in case the overpass is damaged during an earthquake.

Keywords

overpass, earthquake, non-linear static push-over analysis (NSPA), plastic hinges, performance states