LYP160低屈服点钢双沙漏型阻尼器力学性能试验研究与参数分析  

Experimental study and parameter analysis on the mechanical properties of LYP160 low-yield-point steel double hourglass-shaped steel dampers

作　　者：连鸣[1,2] 王江 周玉浩 李伟 LIAN Ming;WANG Jiang;ZHOU Yuhao;LI Wei(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(XAUAT),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《地震工程与工程振动》2024年第6期59-71,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52078411);陕西省创新能力支撑计划-青年科技新星项目(2022KJXX-47);陕西省教育厅青年创新团队科研计划项目(22JP041)。

摘　　要：近年来金属棒体阻尼器因其优越的耗能能力而被广泛运用于结构减震,为进一步提升金属棒体阻尼器的力学性能,文中提出一种由LYP160低屈服点钢制作,带有等截面平直段的双沙漏型阻尼器(LYP160-double hourglass shaped steel damper,LYP-DHSD),为研究LYP-DHSD在剪切位移下的力学性能,设计了2个LYP-DHSD试件,通过低周往复加载试验研究了试件的滞回特性和疲劳性能,建立了LYP-DHSD的精细化有限元模型,并以沙漏耗能段外径、内径和等截面平直段长度为参数进行了滞回性能参数分析,以进一步研究LYP-DHSD在循环剪切位移下的受力模式。研究结果表明:在循环剪切位移下,LYP-DHSD能够实现多截面屈服,具有良好的承载力、变形能力和稳定的耗能能力,疲劳性能满足规范要求;改变内径会显著影响结构的承载力、刚度及耗能,增大等截面平直段则会降低LYP-DHSD的承载力、刚度和耗能能力;增大内径、外径使材料的利用率先增大后减小,改变等截面平直段长度可以实现对LYP-DHSD塑性分布区域的调整;基于文中的分析结果,建议LYP-DHSD的内径与外径比值取0.375~0.625,内径与等截面平直段长度比值取1~2。In recent years,metallic bar dampers have been widely applied in structural vibration reduction due to their excellent energy dissipation capacity.To further enhance the mechanical performance of metallic bar dampers,this study proposes a double hourglass-shaped damper made of LYP160 low-yield-point steel,featuring a constant cross-section straight segment LYP160-double hourglass shaped steel damper(LYP-DHSD).To investigate the mechanical properties of LYP-DHSD under shear displacement,two LYP-DHSD specimens were designed.The hysteretic characteristics and fatigue performance of the specimens were studied through low-cycle reciprocating loading tests.A refined finite element model of LYP-DHSD was developed,and parameter analysis of the hysteretic performance was conducted with the outer diameter,inner diameter,and length of the constant cross-section straight segment as variables to further explore the stress pattern of LYP-DHSD under cyclic shear displacement.The results show that under cyclic shear displacement,LYP-DHSD achieves multi-section yielding and exhibits excellent load-bearing capacity,deformation ability,and stable energy dissipation performance,with fatigue performance meeting code requirements.Adjusting the inner diameter significantly influences the structure’s load-bearing capacity,stiffness,and energy dissipation.Increasing the length of the constant cross-section straight segment reduces the load-bearing capacity,stiffness,and energy dissipation of LYP-DHSD.Additionally,increasing the inner and outer diameters improves material utilization efficiency initially,but it subsequently decreases.Modifying the length of the constant cross-section straight segment allows for adjustments in the plasticity distribution region of LYP-DHSD.Based on the analysis results,it is recommended that the ratio of the inner diameter to the outer diameter of LYP-DHSD be set between 0.375 and 0.625,and the ratio of the inner diameter to the length of the constant cross-section straight segment be set between 1 and 2

关 键 词：低屈服点钢 双沙漏型阻尼器 试验研究 参数分析 滞回性能 疲劳性能 

分 类 号：TU352.1[建筑科学—结构工程]