Title: Probabilistic seismic risk assessment of hybrid fibre-reinforced concrete bridge columns

Authors: Jin-Hai He; Yu-Tao Pang; Xin-Zhi Dang; Wan-Cheng Yuan

Addresses: State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, 1239, Siping Road, Shanghai 200092, China ' Faculty of Engineering, China University of Geosciences, Lumo Road 388, Wuhan, China ' State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, 1239, Siping Road, Shanghai 200092, China ' State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, 1239, Siping Road, Shanghai 200092, China

Abstract: This study evaluates the effect of hybrid fibre-reinforced concrete (HyFRC) material on the seismic performance of reinforced concrete (RC) bridge piers in a probabilistic risk framework. Nine typical RC bridge columns are selected and analysed under 30 as-recorded near-fault ground motions. The HyFRC is simulated using the concrete constitutive model and the bond-slip model. The seismic performance of HyFRC and RC bridge piers is assessed and compared, using the incremental dynamic analysis. The effect of HyFRC is evaluated by comparing limit state capacities, displacement ductility factors, median fragilities, mean annual frequencies and repair time. Results show that the HyFRC columns have improved limit state capacities but the base shear increase slightly. The HyFRC improves the median fragilities but reduces the annual frequencies and repair time, and more effective in improving the limit state capacities of RC bridge piers with lower aspect ratio and higher axial load ratios.

Keywords: hybrid fibre-reinforced concrete; HyFRC; probabilistic seismic risk; bridge columns; incremental dynamic analysis; IDA; seismic fragility.

DOI: 10.1504/IJMPT.2021.117756

International Journal of Materials and Product Technology, 2021 Vol.63 No.3, pp.168 - 193

Received: 13 May 2020
Accepted: 08 Jan 2021
Published online: 23 Sep 2021 *

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