Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Seismic evaluation of the concrete bridge piers reinforced with the combination of SMA rebar and FRP sheet under near field earthquakes

Document Type : Original Article

Authors
Reza Babaie 1
Fereshteh Emami 2
mohammad Reza Mansoori 3
1 Master of Science, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran,, Iran
2 Assistant Professor, Department of civil Engineering,, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 Assistant professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University Tehran, Iran
10.22065/jsce.2024.462263.3436
Abstract
During an earthquake, Bridges are very important as a lifeline in providing aid and relief. In many existing bridges, many non-linear design criteria were not considered or were not available in the bridge design codes at that time. Because with Pier damage, the entire bridge structure is damaged, Strengthening the Pier of existing bridges using new methods such as fiber reinforcement polymer (FRP) sheets and shape memory alloy (SMA) bars is very important. In this study, three-column piers of bridge were investigated at three heights of 7.5, 10 and 15 meters. The piers were analyzed by incremental dynamic analysis (IDA). The utilized earthquake ground motions were 14 pulsed near field records of FEMA-P695 code. These acceleration records were applied once as a combination of horizontal components and another time as a combination of horizontal components along with the vertical component on the bridge pier. The investigated specimens included 12 reinforcement specimens with CFRP sheets and SMA bars with two diameters of 12 and 16 mm. Finally, 5 seismic parameters were evaluated, including spectral acceleration of the first period, ductility, Fragility curve, Maximum displacement, Residual displacement. The results show that the seismic performance has improved by using of 3 layers of CFRP sheets and SMA rebar with a diameter of 16 mm at 5 seismic parameters in both short and long pier. As an example, the ductility index in the pier with a height of 7.5 meters has improved by 25.5% compared to the unreinforced state, and the residual displacement index of the above of the pier in the pier with a height of 7.5 meters has improved by 561.5% compared to the unreinforced state.
Keywords
Pier retrofit
IDA analysis
Residual displacement. Near Field
Fragility curve
Vertical component

Subjects

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  • Receive Date 19 June 2024
  • Revise Date 02 November 2024
  • Accept Date 17 November 2024