“…Christopoulos et al (2008) first proposed the self-centering energy dissipation devices concept as shown in Figure 7. Based on this concept, a variety of self-centering energy dissipation devices have developed (Dong et al, 2017, 2019a; Erochko et al, 2015; Li et al, 2021; Liu and Wu, 2018; Ma and Yam, 2011; Tremblay et al, 2008; Wang et al, 2019, 2021; Xu et al, 2017; Zhou et al, 2015). The research results show that the self-centering energy dissipation devices have excellent self-centering and stable energy dissipation capacities.Figure 7.Mechanics schematic of SCED system (Christopoulos et al, 2008).…”
Section: Bridges With Replaceable Membersmentioning
Bridge structures are the important part of lifeline engineering, which are easy to lose their traffic function when subjected to strong earthquakes. Seismic resilient bridge structures are that do not require repair or can be restored to normal operating condition with minor repair after an earthquake, which are mainly characterized by self-centering capacity, damage control capacity and easy repair. Therefore, the bridge structures with seismic resilience have become one of the research hotspots in bridge engineering due to the excellent characteristics. This paper firstly reviews the development of bridge seismic design theory, and then highlights the current status of research on bridge structures with seismic resilience. The seismic resilient bridge structures are divided into rocking bridges, bridges with replaceable members and bridges with high-performance materials, according to the method to achieve the performance recovery of bridge structures. Then the research status of these three kinds of seismic resilient bridge structures is reviewed and summarized systematically. A large number of experimental studies and numerical simulations have presented that the seismic resilient bridge structures have excellent performance recovery capability. In addition, this paper also summarizes the current research status of performance evaluation and design methods of seismic resilient bridge structures, and presents practical engineering applications of typical seismic resilient bridge structures. Finally, the future research directions and development trends of seismic resilient bridge structures are prospected.
“…Christopoulos et al (2008) first proposed the self-centering energy dissipation devices concept as shown in Figure 7. Based on this concept, a variety of self-centering energy dissipation devices have developed (Dong et al, 2017, 2019a; Erochko et al, 2015; Li et al, 2021; Liu and Wu, 2018; Ma and Yam, 2011; Tremblay et al, 2008; Wang et al, 2019, 2021; Xu et al, 2017; Zhou et al, 2015). The research results show that the self-centering energy dissipation devices have excellent self-centering and stable energy dissipation capacities.Figure 7.Mechanics schematic of SCED system (Christopoulos et al, 2008).…”
Section: Bridges With Replaceable Membersmentioning
Bridge structures are the important part of lifeline engineering, which are easy to lose their traffic function when subjected to strong earthquakes. Seismic resilient bridge structures are that do not require repair or can be restored to normal operating condition with minor repair after an earthquake, which are mainly characterized by self-centering capacity, damage control capacity and easy repair. Therefore, the bridge structures with seismic resilience have become one of the research hotspots in bridge engineering due to the excellent characteristics. This paper firstly reviews the development of bridge seismic design theory, and then highlights the current status of research on bridge structures with seismic resilience. The seismic resilient bridge structures are divided into rocking bridges, bridges with replaceable members and bridges with high-performance materials, according to the method to achieve the performance recovery of bridge structures. Then the research status of these three kinds of seismic resilient bridge structures is reviewed and summarized systematically. A large number of experimental studies and numerical simulations have presented that the seismic resilient bridge structures have excellent performance recovery capability. In addition, this paper also summarizes the current research status of performance evaluation and design methods of seismic resilient bridge structures, and presents practical engineering applications of typical seismic resilient bridge structures. Finally, the future research directions and development trends of seismic resilient bridge structures are prospected.
“…Their cost is also considerably lower than a comparable size of monolithic SMA bar 33,38,39 . Given these advantages, there is a growing interest in using SMA cables for seismic applications, specifically in braces/dampers 40–43 and isolation bearings 44–47 . In addition, more recently, Shi et al 48 .…”
This study explores the development of a shape memory alloy (SMA)-based hybrid self-centering brace that combines NiTi superelastic cables with viscoelastic dampers. First, the behavior of individual components of the hybrid self-centering brace, that is, SMA cables and viscoelastic damper is characterized under various experimental conditions. Then, three prototype hybrid self-centering braces with a maximum force capacity of 172 kN are designed and fabricated. The experimental tests are conducted to reveal the response of This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
“…Having the characteristics of deformation recovery, superelastic Shape memory alloy (SMA) wires, cables, and bars have been widely applied to the isolation devices to improve the recentering capability of bridges (Ozbulut et al, 2011; Peng et al, 2021; Zheng et al, 2019; Dezfuli et al, 2017; Shinozuka et al, 2015; Cao and Yi, 2021; Dong et al, 2019; Zhu and Qiu, 2014) SMA components have been applied to rubber bearing (Guo, 2016; Cui et al, 2019; Cao and Ozbulut, 2020) and friction bearing(Yang, 2017; Wang et al, 2020; Liang et al, 2020). Most of the study show that the SMA-based bearing has the excellent re-centering capacity and displacement-limiting capacity.…”
Although shape memory alloy (SMA) wires/cables can improve the re-centering capacity of traditional isolation devices to prevent residual displacement, pounding, or falling of girders, they also raise the forces in the substructure since the stiffness of the device is increased. In this paper, quasi-static lateral shear tests of an SMA-based negative stiffness isolation device were conducted at first to reduce the increased forces of the substructure. The mechanical properties and the failure modes of the SMA-based negative stiffness isolation device are studied. Next, the SMA-based negative stiffness isolation device is updated based on its failure modes. Finally, the mechanical properties of the improved device were numerically studied. The results show that the new SMA-based negative stiffness isolation device can partially reduce the force responses of the substructure in addition to keeping excellent re-centering capability. Moreover, it can also limit the excessive displacement of bridges to prevent the girders from falling.
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