Seismic Assessment of Isolated Bridge configurations adopting a Performance-Based Earthquake Engineering (PBEE) methodology - K4

Performance-Based Earthquake Engineering (PBEE) aims to quantify the seismic performance and risk of engineered facilities using metrics that are of immediate use to both engineers and stakeholders. Recently, Mackie and co-workers have pioneered the development of a bridge performance-based analysis framework using the numerical PEER platform OpenSees. Simultaneously, Elgamal and co-workers had embarked on development of a three-dimensional (3D) ground-foundation graphical user interface OpenSeesPL that employs OpenSees as the finite element (FE) analysis engine. The paper aims to exercise and develop this framework highlighting the potential beneficial effect of isolation devices on bridge - abutment interaction in reducing the bridge column displacement and repair costs. In particular, the study presents a 90 meter long, two – span bridge with various configurations of abutments and pier connections (isolation devices) at the top of the columns and in correspondence of the abutments. The beneficial contribution of the isolation technique is assessed evaluating the resistance effects applied to Peak Ground Acceleration levels in terms of cost and time repair quantities.

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