摘要
针对传统铅黏弹性阻尼器单一承载力的局限性,本文提出一种新型双阶铅黏弹性阻尼器(two-level lead viscoelastic damper,TLVD),该阻尼器通过在1阶与2阶外板之间设置间隙,形成双阶耗能工作机制。为验证TLVD工作机理的可行性,本文推导了TLVD承载力计算公式,建立其ABAQUS有限元模型并分析了滞回性能、能量耗散能力和应力分布等力学性能参数。研究结果表明,在小位移下TLVD仅依靠1阶耗能单元耗能,在较大位移下激活2阶耗能单元进而实现双阶耗能;在最大加载位移下,TLVD承载力模拟值与计算值误差为1.1%,证明TLVD有限元模型与计算理论合理可信;TLVD滞回曲线与能量耗散图呈现出明显的双阶段工作特性,且承载力和耗能能力显著提高,能够有效应对不同激励和响应;铅芯和复合黏弹性层的协同工作机制保证了TLVD的高效耗能能力,进一步增强其结构安全性和耐久性;TLVD的双阶工作特性,可满足结构减震设计中的多重设防目标要求。
In this study,to address the limitation of traditional lead viscoelastic dampers,which only have a one-level load-bearing capacity,a novel two-level lead viscoelastic damper(TLVD)is proposed.A gap is designed between the first and second outer plates,thereby enabling a two-level energy dissipation mechanism.To validate the feasibility of the proposed working mechanism,the load-bearing capacity formulation for TLVD is derived,and a finite element model of the TLVD is established to comprehensively analyze its hysteretic behavior,energy dissipation capacity,stress distribution,etc.The results indicate that the TLVD dissipates energy solely through the first-level energy dissipation unit at small displacements,while the second-level energy dissipation unit is activated at larger displacements,thus achieving two-level energy dissipation.At the maximum displacement,the error of the bearing capacity of the finite element simulation compared with that of the calculation formula is 5.3%,proving that both are reasonable and reliable.The hysteresis curve and energy dissipation plot of the TLVD exhibit a two-level working characteristic,with significantly improved load-bearing capacity and energy dissipation ability,enabling it to handle different responses.Moreover,the synergistic interaction between the lead and the composite viscoelastic layer ensures the efficient energy dissipation of the TLVD,further enhancing its structural safety and durability.Furthermore,the two-level energy dissipation mechanism of TLVD can be applied in structural design of energy dissipation to meet multiple defense objectives.
作者
李梓杰
张超
叶景鸿
黄玮均
LI Zijie;ZHANG Chao;YE Jinghong;HUANG Weijun(School of Civil Engineering and Transportation,Guangzhou University,Guangzhou 510006,China)
出处
《地震工程与工程振动》
北大核心
2026年第2期144-153,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家重点研发计划项目(2022YFC3803000)。
关键词
铅黏弹性阻尼器
双阶耗能
力学性能
工作机理
有限元模拟
lead viscoelastic damper
two-level energy dissipation
mechanical properties
working mechanism
finite element simulation
