地震是破坏性极强的突发自然灾害，它不仅严重毁坏建筑物，还可能引发火灾、爆炸、海啸等次生灾害，成为建筑物面临的最严重自然灾害之一。在地震中，传统建筑主要依靠自身的强度、刚度和塑性来抵抗地震和耗散能量，但这常常导致结构构件的屈服或破坏。因此，提高建筑结构的抗震性能，减少地震造成的损害，是工程界和学术界持续关注和研究的重要课题。针对传统框架结构的这些缺点，自复位钢框架能有效地改善这些缺点。本文设计了一种新型环形弹簧自复位阻尼器，并将其应用于钢框架结构中。通过对该环形弹簧自复位阻尼器钢框架进行静力和动力时程分析，评估了其抗震和自复位性能。研究内容包括：

（1）介绍了环形弹簧自复位阻尼器的基本构造和安装顺序。通过有限元分析软件ABAQUS对环形弹簧自复位阻尼器进行了精细化建模，新型环形弹簧自复位阻尼器的滞回曲线呈“旗帜形”，表明环形弹簧自复位阻尼器具有良好的自复位能力。对影响其力学性能的设计参数进行了分析，研究了环簧组预压力、环簧组个数和环簧外环直径对环形弹簧自复位阻尼器滞回曲线和自复位性能的影响。

（2）提出了OpenSees中环形弹簧自复位阻尼器采用两种材料叠加的简化建模方法，对比不同环形弹簧预压力、环簧组数量和环簧外环直径下环形弹簧自复位阻尼器OpenSees模拟结果和ABAQUS模拟结果，表明OpenSees和ABAQUS模拟所得的环形弹簧自复位阻尼器滞回曲线基本吻合。通过调整OpenSees中的相应材料参数，可实现对不同设计尺寸的环形弹簧自复位阻尼器力学性能的精确模拟。

（3）利用OpenSees建立了一个配置环形弹簧自复位阻尼器的6层钢框架结构模型，对其进行静力分析。分析结果表明该结构满足抗震变形和承载力要求。该结构在低周往复加载下的基底剪力-顶点位移滞回曲线呈“旗帜形”，表明结构具有良好的自复位能力。各层环形弹簧自复位阻尼器的轴力-变形滞回曲线表明各层的阻尼器均起到了提供可恢复能力的作用。

（4）对配置环形弹簧自复位阻尼器的钢框架进行了动力时程分析，通过验算得出自复位钢框架在多遇地震和罕遇地震下都满足规范要求且能保持可恢复能力。表明配置环形弹簧自复位阻尼器的钢框架在具有良好抗震性能的基础上可实现自复位能力。

Earthquakes, as highly destructive sudden natural disasters, not only severely damage structures but can also trigger secondary disasters such as fires, explosions, and tsunamis, making them one of the most severe natural threats to buildings. Traditional buildings primarily rely on their inherent strength, stiffness, and ductility to resist seismic forces and dissipate energy, which often leads to the yielding or failure of structural components. Therefore, enhancing the seismic performance of building structures and reducing the damage caused by earthquakes is a significant and ongoing area of concern and research within both the engineering and academic communities. To address the shortcomings of conventional frame structures, self-centering steel frames can effectively mitigate these issues. This paper introduces a novel circular spring self-centering damper and integrates it into steel frame structures. The seismic and self-centering performance of the steel frame equipped with the circular spring self-centering damper is evaluated through both static and dynamic time-history analyses. The research encompasses the following aspects:

(1) The basic configuration and installation sequence of the novel circular spring self-centering damper are explained. A detailed finite element model of the damper is constructed using the ABAQUS software, which reveals a "flag-shaped" hysteresis curve, indicating the damper's excellent self-centering capability. Additionally, the influence of key parameters, such as the pre-stress force of the spring group, the number of spring groups, and the outer diameter of the circular spring, on the hysteresis curve and self-centering performance of the damper is analyzed using ABAQUS.

(2) A comparison of the OpenSees and ABAQUS simulation results for the circular spring self-centering damper under different pre-stress forces, spring group numbers, and outer diameters of the circular spring shows that the hysteresis curves obtained from both simulations are essentially consistent. This suggests that the self-centering material superposition method in OpenSees can be used for parameter setting of the circular spring self-centering damper.

(3) A six-story steel frame with the circular spring self-centering damper is modeled using OpenSees and subjected to static analysis, which shows that the structure meets the requirements for seismic deformation and load capacity. Dynamic low-cycle loading analysis of the six-story steel frame with the damper reveals a "flag-shaped" hysteresis curve, demonstrating the structure's good self-centering ability. The hysteresis curves of the self-centering dampers on each floor are presented, highlighting their crucial role in the recoverable capacity of the structure.

(4) Dynamic time-history analysis of the steel frame equipped with circular spring self-centering dampers is conducted, and it is verified that the self-centering frame meets the code requirements and maintains recoverability under both frequent and rare earthquakes. This indicates that the steel frame with the circular spring self-centering damper not only possesses good seismic performance but also achieves self-centering capability.

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