摘要
针对钢管约束钢筋混凝土(steel tubed reinforced concrete,STRC)柱节点抗震性能薄弱的现状,提出采用改良的铅黏弹性阻尼器进行增强。基于ABAQUS工作平台对铅黏弹性阻尼器试件建立有限元模型,将数值计算所得滞回和骨架曲线、耗能性能及疲劳性能与试验结果进行对比,两者吻合较好。在此基础上探讨了铅芯直径、铅芯布置形式及复合黏弹性体厚度比值对铅黏弹性阻尼器力学性能的影响。结果表明:相较于扇形铅黏弹性阻尼器,改良后的四边形铅黏弹性阻尼器表现出更好的力学性能;随着铅芯直径的增大,阻尼器的耗能能力指标均得到大幅提高;建议铅芯个数取2个,铅芯面积与复合黏弹性层面积比值取6%~8%,复合黏弹性体厚度比值约为0.67。建立不同布置方案的铅黏弹性阻尼器增强STRC柱节点试件模型,对其破坏形态、滞回特性和箍筋应力进行对比分析,给出合理的布置方案,为实际工程提供参考。
In view of the weak seismic behavior of conventional steel tubed reinforced concrete(STRC)column joints,an improved lead viscoelastic damper was proposed for its strengthening.Based on the ABAQUS working platform,a finite element model was established for the lead viscoelastic damper specimen.The hysteresis and skeleton curves,energy dissipation,and fatigue behavior obtained by numerical calculations were compared with the experimental results,and the two were in good agreement.On this basis,the effects of lead core diameter,lead core arrangement,and composite viscoelastic thickness ratio on the mechanical properties of the lead viscoelastic damper were explored.The results show that compared to the fan-shaped lead viscoelastic damper,the improved quadrilateral lead viscoelastic damper exhibits better mechanical performance;as the diameter of the lead core increases,the energy dissipation capacity indicators of the damper are significantly improved;it is recommended to take 2 lead cores,the area ratio of the lead core and the composite viscoelastic layer,is 6%to 8%and the thickness ratio takes approximately 0.67 for the composite viscoelastic body.The models for the specimens of various lead viscoelastic dampers reinforced STRC column joints with different arrangement schemes were established.Their failure modes,hysteresis characteristics and stirrup stress were compared and analysed.The reasonable arrangement schemes were proposed for practical engineering reference.
作者
王秋维
景烜光
史庆轩
李雪梅
WANG Qiuwei;JING Xuanguang;SHI Qingxuan;LI Xuemei(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第6期238-247,共10页
Journal of Vibration and Shock
基金
国家自然科学基金(52178505
51878543)。
