摘要
装配式钢结构连接节点在反复地震荷载作用下易发生刚度退化,局部区域的应力集中与软化易形成塑性变形集中区,导致其屈服承载力与极限承载力显著下降,进而引发结构整体或局部失稳。为此,本文针对地震荷载作用下装配式钢结构屈曲约束支撑的受力性能展开研究。设计并制备了分别以丁基橡胶层和轻质高强混凝土为填充材料的屈曲约束支撑试件B1和B2。利用电液伺服试验机进行分级位移加载下的拟静力试验,对比分析了2个试件的累积塑性变形、等效粘滞阻尼比、弹性/塑性刚度、屈服/极限承载力及位移等性能。同时,基于Abaqus软件建立精细化三维有限元模型,考虑混合硬化与双线性材料本构关系,选取涵盖长周期、高频、近断层脉冲等多种特性的地震波(如Imperial Valley-02、Northridge等)进行静力与动力时程分析。结果表明:橡胶层填充的B1试件综合性能显著优于混凝土填充的B2试件,具有更高的累积塑性变形(L/100级达485.25)和等效粘滞阻尼比(L/100级达0.445),表明其将地震能量转化为热能的能力更强;B1试件表现出更优的延性,极限位移达18.33 mm;数值模拟显示,B1试件内核芯板应力分布更均匀,最大应力值仅为220 MPa,有效缓解了应力集中;其滞回曲线饱满对称,验证了橡胶层在变形协调性、能量耗散效率及长期稳定性方面的优势。本研究证实,使用橡胶层作为屈曲约束支撑填充材料可显著提升装配式钢结构在地震作用下的承载能力、耗能能力及延性,为其在高烈度区的工程应用提供了理论依据和技术支持。
The assembled steel structure connection nodes are prone to stiffness degradation under repeated seismic loads.Local stress concentration and softening in these areas can form plastic deformation concentrated zones,resulting in a significant decrease in their yield bearing capacity and ultimate bearing capacity,and subsequently causing overall or local instability of the structure.Therefore,this paper conducts a study on the mechanical performance of the buckling restraint supports under seismic loads for assembled steel structures.Two specimens,B1 and B2,were designed and fabricated with butyl rubber layers and lightweight high-strength concrete as the filling materials.Quasi-static tests under staged displacement loading were carried out using an electro-hydraulic servo testing machine,and the performance indicators such as cumulative plastic defor-mation,equivalent viscous damping ratio,elastic/plastic stiffness,yield/final bearing capacity,and displacement were compared and analyzed for both specimens.Meanwhile,a refined three-dimensional finite element model was established based on the Abaqus software,considering mixed hardening and biaxial material constitutive relationships,and earthquake waves with various characteristics(such as Imperial Valley-02,Northridge,etc.)were selected for static and dynamic time-history analyses.The results show that the comprehensive performance of the B1 specimen filled with the butyl rubber layer is significantly better than that of the B2 specimen filled with concrete,with higher cumulative plastic deformation(up to 485.25 at the L/100 level)and equivalent viscous damping ratio(up to 0.445),indicating that it has a stronger ability to convert seismic energy into heat.The B1 specimen exhibits better ductility,with a final displacement of 18.33 mm.Numerical simulations show that the core core plate stress distribution in the B1 specimen is more uniform,with the maximum stress value being only 220 MPa,effectively alleviating stress concentration.Its hysteresis curve is full and symmetrical,verifying the advantages of the butyl rubber layer in deformation coordination,energy dissipation efficiency,and long-term stability.This study confirms that using the butyl rubber layer as the filling material for buckling restraint supports can significantly enhance the bearing capacity,energy dissipation capacity,and ductility of assembled steel structures under seismic action,providing theoretical basis and technical support for their engineering application in high-intensity areas.
作者
孙嘉琪
于秋波
SUN Jiaqi;YU Qiubo(School of Architectural Engineering,Zhengzhou University of Industrial Technology,Zhengzhou 451150,China;College of Civil Engineering,Zhengzhou University,Zhengzhou 450000,China;Zhengzhou University Multi-functional Design Research Academy Co.Ltd.,Zhengzhou 450000,China)
出处
《兵器材料科学与工程》
北大核心
2026年第1期119-126,共8页
Ordnance Material Science and Engineering
基金
河南省科技攻关项目(162102310190)。
关键词
地震荷载
装配式钢结构
屈曲约束支撑
屈服承载力
极限承载力
seismic load
prefabricated steel structure
buckling-restrained brace
yielding bearing capacity
ultimate bearing capacity
