新型雀替式黏弹性阻尼器试验与力学性能分析
Experimental and mechanical performance analysis of novel sparrow brace type viscoelastic dampers
彭国威 1陶忠 1徐荣荣 1戴必辉 2燕钊1
作者信息
- 1. 昆明理工大学 建筑工程学院,云南 昆明 650500;云南省抗震工程技术研究中心,云南 昆明 650500
- 2. 昆明理工大学 建筑工程学院,云南 昆明 650500;西南林业大学 土木工程学院,云南 昆明 650224
- 折叠
摘要
该文提出一种新型雀替式黏弹性阻尼器,为研究其构造形式的合理性和可行性,对 5 个新型雀替式黏弹性阻尼器进行了变形相关性、频率相关性以及疲劳性能循环加载试验,分析新型雀替式黏弹性阻尼器的耗能系数、等效黏滞阻尼比和骨架曲线等几项性能参数.研究结果表明:5 个新型雀替式黏弹性阻尼器滞回曲线饱满,滞回性能较好,耗能能力较强,橡胶硬度为 65°的试件累计耗能为2.343 kN·m;变形幅值对阻尼器的影响明显,随着变形量的增加,阻尼器的最大阻尼力和周期耗能逐渐增大,能量耗散系数和等效刚度逐渐减小;不同橡胶材料的新型雀替式黏弹性阻尼器试件的滞回曲线、等效黏滞阻尼比和骨架曲线形状基本一致;不同加载频率下,耗能系数和等效黏滞阻尼比分别在 0.03962～0.04016 和 0.1260～0.1320 之间,2 个性能指标变化均较小,频率相关性较弱;疲劳加载后新型黏弹性阻尼器耗能系数衰减 24.8%,等效黏滞阻尼比衰减 25.4%,具有良好的疲劳性能,无明显的滞回曲线面积衰减和低周疲劳现象.
Abstract
The article proposes a novel sparrow brace type viscoelastic damper.In order to study the rationality and feasibility of its structural form,cyclic loading tests were conducted on five of these new sparrow brace type viscoelastic dampers,examining deformation correlation,frequency correlation,and fatigue performance.The analysis included the evaluation of several performance parameters of the new sparrow brace type viscoelastic dampers,such as energy dissipation coefficients,equivalent viscous damping ratios,and skeleton curves.Research results show that the hysteresis loops of the five new sparrow brace type viscoelastic dampers are full,indicating excellent hysteresis performance and strong energy dissipation capability.For specimens with a rubber hardness of 65°,the cumulative energy dissipation is 2.343 kN·m.The influence of deformation amplitude on the damper is evident.As the deformation increases,the maximum damping force and cyclic energy dissipation of damper gradually increase,while the energy dissipation coefficient and equivalent stiffness gradually decrease.The hysteresis loops,equivalent viscous damping ratios,and skeleton curve shapes of specimens with different rubber materials for the new sparrow brace type viscoelastic dampers are basically consistent.Under different loading frequencies,the energy dissipation coefficients range from 0.03962 to 0.04016,and the equivalent viscous damping ratios range from 0.1260 to 0.1320.Both performance indicators exhibit relatively minor changes,suggesting a weak correlation with frequency.After fatigue loading,the energy dissipation coefficient of the new viscoelastic damper decreases by 24.8%,and the equivalent viscous damping ratio decreases by 25.4%,demonstrating excellent fatigue performance without a significant reduction in hysteresis loop area or the occurrence of low-cycle fatigue phenomena.
关键词
木结构加固/新型雀替式黏弹性阻尼器/变形相关性/频率相关性/疲劳性能/滞回耗能Key words
timber structure reinforcement/novel sparrow brace type viscoelastic damper/deformation correlation/frequency correlation/fatigue performance/hysteretic energy引用本文复制引用
基金项目
国家自然科学基金项目(52268051)
云南省农业联合专项(202301BD07001-128)
出版年
2024
NETL
NSTL
万方数据