Seismic response analysis of continuous beam bridge with Fe-SMA-DVFPBs
Here,aiming at problems of excessive displacement and insufficient self-resetting ability of traditional double-concave friction pendulum seismic isolation bridge bearings,using the variable friction mechanism and hyper-elastic properties of shape memory alloy,a new type of iron-based shape memory alloy-double-concave variable friction pendulum bearing(Fe-SMA-DVFPB)was developed.Its constitutive model was constructed and its equivalent analysis model was determined.A displacement-based aseismic design method for Fe-SMA-DVFPB isolated bridges was proposed.Taking practical projects as background,seismic isolation bridges with different types of bearings were designed,and their aseismic performances were analyzed contrastively.The study showed that compared to traditional double-concave friction pendulum bearing isolated bridges,the maximum reduction in relative displacement of Fe-SMA-DVFPB isolated bridge is 23.79％,and the maximum reduction in residual displacement is 93.56％;application of Fe-SMA-DVFPB can more effectively control relative displacement and residual displacement of bearings;bearing relative displacement and residual displacement reductions of Fe-SMA-DVFPB isolated bridge are significantly larger than increase in pier bottom bending moment and shear force;Fe-SMA-DVFPB can further improve post-earthquake resilience of bridges.
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