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Seismic design and performance evaluation of innovative controlled rocking dual-fused bridge system

University of British Columbia

It is crucial for highway bridges to remain operational after strong earthquakes as they are critical infrastructures to transport resources. In this study, an innovative seismic-resilient bridge structural system, named controlled rocking dual fused bridge (CRDFB) system is proposed. The CRDFB system is designed to improve the seismic performance of bridges through the use of replaceable lead extrusion dampers at the base of the rocking piers. The CRDFB system is strategically designed to achieve three tiers of performance objectives at different shaking intensities. For this purpose, the state-of-the-art Equivalent Energy Design Procedure (EEDP) is adopted. The proposed step-by-step EEDP allows engineers to design the CRDFB system to achieve the desired performance objectives with simple hand calculations and without iterations. Examples of seismic design using the proposed EEDP are presented for one 2-span and one 3-span CRDFB prototypes located in Vancouver, Canada. To validate the performance of the proposed CRDFB system, advanced three-dimensional analytical models of designed prototypes are developed in finite element software OpenSees and subjected to a broad array of two-dimensional and three-dimensional nonlinear time history analyses. Simulation results show that CRDFB prototypes can successfully achieve the targeted performance, as specified by EEDP design, at different shaking intensities. Hence, the proposed CRDFB system can be designed efficiently using the EEDP design procedure outlined in this paper, and be used as an efficient, reliable, and resilient seismic force-resisting bridge system for high seismic zones.

Text

2019-12-24

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/72983

Civil Engineering

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/