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新型自复位变摩擦耗能支撑及其在桥墩抗震中的应用

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为了减小传统摩擦耗能支撑在强震作用下的残余变形,提出一种基于形状记忆合金(SMA)板材的新型装配式自复位变摩擦耗能支撑(S-SCFB),该支撑主要包括SMA板圆环自复位系统和摩擦耗能系统.首先阐述了新型支撑的基本构造,揭示了其工作机理和自复位原理;通过开展SMA板材的材性试验研究了其力学性能,基于SMA板材的力学性能和支撑的工作机理,建立了新型支撑的简化分析模型;然后基于ABAQUS有限元软件建立了新型支撑的精细化实体有限元模型,将数值模拟结果与简化分析模型进行了对比分析,系统地研究了新型支撑的滞回性能及影响规律,同时在OpenSees软件中2次开发了新型支撑的恢复力模型;最后,基于新型支撑优良的滞回性能,将其应用到双柱式桥墩中提升桥墩的抗震韧性.研究结果表明:SMA板材本构模型呈"旗帜"型,具有承载力高,变形能力强,自恢复能力良好等优点;基于SMA板材装配的S-SCFB具有稳定的耗能能力和优良的自复位功能,卸载后无残余变形,同时建立的简化分析模型与数值模拟结果吻合较好;通过调整S-SCFB的设计参数,可有效实现调节S-SCFB滞回性能的目的,具有良好的可调节性;附加S-SCFB可以有效提高桥墩的强度和刚度,降低结构的残余位移,有效提高桥墩结构的抗震性能.
Novel Self-centering Variable Friction Energy Dissipation Brace and Its Application in Seismic Resistance of Bridge Piers
To reduce the residual deformation of conventional frictional energy dissipation braces under severe earthquakes,a novel self-centering variable frictional energy dissipation brace(S-SCFB)based on a shape memory alloy(SMA)was developed.The S-SCFB mainly consists of an SMA plate ring self-centering system and frictional energy dissipation system.First,the configuration of the novel brace is described,and its working and self-centring principles were revealed.The mechanical properties of the SMA plates were studied by conducting material tests,and a simplified analytical model of the novel brace was established.Second,a solid numerical model of the brace was established using ABAQUS.The simulation results were compared with the calculation results of the simplified analytical model,and the hysteresis performance and influencing factors of the novel brace were studied systematically.Simultaneously,the restoring force model of the novel brace was developed using OpenSees software.Finally,owing to its excellent hysteresis performance,the novel brace was applied to the double-column bridge piers to improve the seismic resilience of the bridge piers.The results show that the constitutive model of the SMA plate has a"flag-shaped,"which has a high bearing capacity,good deformation capacity,and good self-centering ability.The assembled S-SCFB based on SMA plates exhibits stable energy dissipation capacity,excellent self-centering ability,and no residual deformation during unloading;the established simplified analysis model agrees with the finite element simulation results.The hysteresis performance could be effectively adjusted by changing the design parameters of the S-SCFB.An additional S-SCFB can effectively improve the strength and stiffness of bridge piers,reduce the residual displacement of the structure,and effectively improve the seismic resilience of the structure.

bridge engineeringseismic resiliencematerial testnumerical simulationself-cen-tering variable friction energy dissipation braceshape memory alloy(SMA)platehysteresis performance

董慧慧、胡潇、韩强、杜修力

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北京工业大学城市与工程安全减灾教育部重点实验室,北京 100124

北京工业大学城市建设学部,北京 100124

桥梁工程 抗震韧性 材性试验 数值模拟 自复位变摩擦耗能支撑 形状记忆合金(SMA)板材 滞回性能

国家自然科学基金项目国家自然科学基金项目北京市教育委员会项目

5190832552078019IDHT20190504

2024

10.19721/j.cnki.1001-7372.2024.01.006

中国公路学报
中国公路学会

中国公路学报

CSTPCD北大核心
影响因子：1.607
ISSN：1001-7372
年,卷(期)：2024.37(1)
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