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Smart Structures and Systems
  Volume 24, Number 1, July 2019 , pages 127-139

Seismic damage mitigation of bridges with self-adaptive SMA-cable-based bearings
Yue Zheng, You Dong, Bo Chen and Ghazanfar Ali Anwar

    Residual drifts after an earthquake can incur huge repair costs and might need to replace the infrastructure because of its non-reparability. Proper functioning of bridges is also essential in the aftermath of an earthquake. In order to mitigate pounding and unseating damage of bridges subjected to earthquakes, a self-adaptive Ni-Ti shape memory alloy (SMA)-cable-based frictional sliding bearing (SMAFSB) is proposed considering self-adaptive centering, high energy dissipation, better fatigue, and corrosion resistance from SMA-cable component. The developed novel bearing is associated with the properties of modularity, replaceability, and earthquake isolation capacity, which could reduce the repair time and increase the resilience of highway bridges. To evaluate the super-elasticity of the SMA-cable, pseudo-static tests and numerical simulation on the SMA-cable specimens with a diameter of 7 mm are conducted and one dimensional (1D) constitutive hysteretic model of the SMAFSB is developed considering the effects of gap, self-centering, and high energy dissipation. Two types of the SMAFSB (i.e., movable and fixed SMAFSBs) are applied to a two-span continuous reinforced concrete (RC) bridge. The seismic vulnerabilities of the RC bridge, utilizing movable SMAFSB with the constant gap size of 60 mm and the fixed SMAFSBs with different gap sizes (e.g., 0, 30, and 60 mm), are assessed at component and system levels, respectively. It can be observed that the fixed SMAFSB with a gap of 30 mm gained the most retrofitting effect among the three cases.
Key Words
    self-adaptively resilient bridges; SMA-cable-based bearing; seismic vulnerability analysis; probabilistic seismic damage method
Yue Zheng: Department of Bridge Engineering, Tongji University, Shanghai, China;
Department of Civil and Environmental Engineering, University of California, Berkeley, USA
You Dong and Ghazanfar Ali Anwar: Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Bo Chen:Key Laboratory of Roadway Bridge and Structural Engineering, Wuhan University of Technology, Wuhan, China

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