Seismic Fragility Assessment of Seismic Isolated Bridges in Cold Climates
Publication: Lifelines 2022
ABSTRACT
Seismic isolation has been extensively used around the world for seismic protection of structures. Several high seismic regions around the world experience seasonal freezing that can drastically alter isolation bearing properties and structural response under earthquake loads. Under subfreezing temperature, mechanical properties of bearings are affected as well as the properties of concrete and steel reinforcement. The objective of this study is to evaluate the seismic performance of a base isolated bridge equipped with Friction Pendulum System and Lead Rubber Bearing located in extreme cold climate. Considering the change in mechanical properties of isolation bearings such as, shear stiffness, yield strength, and friction coefficient, due to temperature change, the seismic performance of isolated bridges is evaluated. Detailed nonlinear three-dimensional finite element models of the isolated bridges considering the material properties at cold temperature are developed. Finally, fragility curves are developed for seismic vulnerability assessment of isolated bridges at subfreezing temperature.
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Lifelines 2022
Pages: 198 - 209
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Published online: Nov 16, 2022
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