首页|SMA绞线预制梁-柱自复位耗能节点数值研究与参数优化

SMA绞线预制梁-柱自复位耗能节点数值研究与参数优化

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为了提高预制混凝土框架的抗震能力并控制震后残余变形,提出了一种新型的混合自复位预制混凝土梁柱节点(self-centring precast concrete beam-column connection,SC-PCBCC),其中采用了旋转摩擦阻尼器(rotational friction hinge damper,RFHD)和形状记忆合金(shape memory alloy,SMA)并联的结构.重点探讨了使用SMA绞线控制的自复位装置对SC-PCBCC进行改进.首先,介绍了SC-PCBCC的结构和工作原理;其次验证对比了 1.0%、1.5%、2%和 2.0%预应变下的超弹性 1×7 SMA绞线、RFHD和SC-PCBCC的有限元模型,并进行了初步验证.研究结果表明,该节点具有较高的刚度、承载力、耗能能力以及较好的复位性能;最后对SC-PCBCC中SMA绞线的关键参数:SMA绞线预应变、直径和长度进行了参数分析,以优化其抗震性能.建议SC-PCBCC使用的SMA绞线初始预应变、直径和长度范围分别为 1.5%～2.0%、15～18 mm和 175～205 mm,以实现SC-PCBCC的优异承载性能、能量耗散和自复位性能.此外,节点中的SMA绞线和RFHD可在震后快速更换,实现高效灾后修复.总体而言,所提出的SC-PCBCC表现出了卓越的减震能力、自复位能力和可修复性.
Numerical study and parameter optimization of self-centring precast beam-column joint with SMA cables
To enhance the seismic capacity of precast concrete frames and mitigate residual deformation following earthquakes,this research presents a novel hybrid self-centring precast concrete beam-column connection(SC-PCBCC)incorporating rotational friction hinge damper(RFHD)and shape memory alloy(SMA)parallel structure.The primary focus of this study is to improve the SC-PCBCC using a self-centring mechanism controlled by SMA cables.Initially,the structure and operational principles of the SC-PCBCC are introduced.Subsequently,the finite element(FE)models of super-elastic 1×7 SMA cables with 1.0%,1.5%,2.0%and 2.5%pre-strains were verified and compared,along with the RFHD and SC-PCBCC,with preliminary verifications conducted.The research findings indicate that the proposed joint has high stiffness,bearing capacity,energy dissipation capacity and good self-centring performance.Parametric analysis was then performed on key parameters of SMA cables in SC-PCBCC:SMA cables pre-strain,diameter and length were analysed to optimize its seismic performance.It is recommended that the SC-PCBCC design includes SMA cables with initial pre-strains ranging from 1.5%to 2.0%,diameters between 15 mm and 18 mm,and lengths from 175 mm to 205 mm to achieve optimal load-bearing capacity,energy dissipation and self-centring performance as proposed.Moreover,the SMA cables and RFHD can be readily replaced after earthquake to achieve efficient post-disaster repair.Overall,the proposed SC-PCBCC demonstrates exceptional shock-absorption,self-centring,and repairability properties.

precast beam-column jointshape memory alloy(SMA)cablesratational friction hinge damper(RFHD)seismic performancenumerical analysis

张云雷、钱辉、叶剑楠、魏德新、师亦飞

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郑州万科企业有限公司,河南 郑州 450001

郑州大学土木工程学院,河南 郑州 450001

预制混凝土梁柱节点 形状记忆合金(SMA)绞线 旋转摩擦铰接阻尼器(RFHD) 抗震性能 数值分析

国家自然科学基金项目中原科技创新领军人才计划河南省高校科技创新团队支持计划

5197863123420051002223IRTSTHN006

2024

10.19994/j.cnki.WEE.2024.0043

世界地震工程
中国地震局工程力学研究所 中国力学学会

世界地震工程

CSTPCD北大核心
影响因子：0.523
ISSN：1007-6069
年,卷(期)：2024.40(3)
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