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摩擦耗能型摇摆柱节点抗震性能研究

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基于可恢复功能的概念,提出了一种摩擦耗能型摇摆柱节点.阐述了该节点的构造形式并研究了其抗震性能.通过试验和数值模拟,分析了轴压比、弹簧刚度等参数对节点抗震性能的影响及节点在余震和修复情况下的韧性.研究结果表明,在±3%层间位移角内,节点呈现出低损伤特性,摇摆柱始终保持弹性.在轴向力作用下,滞回曲线呈明显的"旗帜形",节点具有良好的自复位性能,最大残余转角仅为0.23%.通过重新拧紧螺栓,节点性能即可恢复至震损前水平,实现抗震韧性.弹簧刚度的增大可以显著提高节点的抗弯承载力;增大轴压比可以提高节点的"屈服"弯矩和极限弯矩.在轴向力作用下节点属于典型的半刚性连接,并确定了节点初始转动刚度的取值范围.针对该节点提出了一个简化的恢复力模型,理论结果与试验结果吻合度较好,为进一步对整体结构进行分析和设计奠定了基础.
Seismic Performance of Rocking Column Joints with Friction Dissipation
Based on the concept of seismic resilient structures,a rocking column joint with friction dissipation was proposed.The configuration of the joint was presented and its seismic performance was investigated.The effects of parameters such as axial compression ratio and spring stiffness on the seismic performance and resilience of the joint under aftershock and restoration cases were analyzed through cyclic loading tests and numerical simulations.The study shows that the joint exhibits low-damage characteristics within±3%drift ratio.With the presence of axial force,the rocking column always remains elastic,and the hysteresis curve is obviously in a"flag-shaped"pattern.The joint possesses good self-centering performance,with a maximum residual drift of only 0.23%.By re-tightening the bolts,the joint performance can be restored to the level before seismic damage and achieve seismic resilience.The increase in spring stiffness can significantly improve load carrying capacity of the joint.The increase in axial compression ratio can improve both"yield"moment and ultimate bending moment of the joint.The joint is typically a semi-rigid joint under the action of axial force,and a range of initial rotational stiffness of the joint is determined.Finally,a simplified analytical model is proposed for the joint.The theoretical and experimental results are in a good agreement,which provides a reference for further analysis and design of the overall structure.

rocking columnlow-damageself-centeringfriction slidingseismic performance

李成玉、姚宗杰、张睿、贾良玖、陈焰周

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武汉科技大学城市建设学院,武汉 430065

武汉科技大学城市更新湖北省工程研究中心,武汉 430065

同济大学土木工程学院,上海 200092

同济大学土木工程防灾减灾全国重点实验室,上海 200092

中南建筑设计院股份有限公司,武汉 430071

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摇摆柱 低损伤 自复位 摩擦滑移 抗震性能

国家自然科学基金

51878522

2024

建筑钢结构进展
同济大学

建筑钢结构进展

CSTPCD北大核心
影响因子:0.806
ISSN:1671-9379
年,卷(期):2024.26(2)
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