为了减小传统金属阻尼器在强震作用下的损伤与残余变形，提出了一种具有自复位功能的金属耗能阻尼器，阐述了该自复位阻尼器的构造形式与工作机理，给出了其工程实用简化设计方法。通过理论分析建立了自复位阻尼器的恢复力模型，利用有限元模拟对阻尼器进行了参数化分析，并且将恢复力模型的计算结果与有限元模型的模拟结果进行了对比分析。研究结果表明自复位金属耗能阻尼器利用复合组合碟形弹簧的弹性恢复力能够有效减小其震后残余变形；自复位阻尼器的滞回曲线为饱满的旗帜形，表明其具有较好的自复位性能和耗能性能；恢复力模型的计算结果与有限元方法的模拟结果吻合较好，证明建立的恢复力模型能够较好地反映自复位阻尼器在循环加载时的滞回性能。有限元分析同时表明构件之间的初始间隙会削弱阻尼器的自复位性能，因此安装阻尼器时应保证构件之间紧密接触。
Abstract
To reduce the damage and residual deformation of the traditional metal dampers under strong earthquakes, a type of metal energy dissipation damper with self-centering capability is proposed. Firstly, the configuration form and working mechanism of the self-centering damper are introduced. Then an engineering practical simplified method of the damper is proposed. Secondly, restoring force model of the damper is established by theoretical analyses. Finally, finite element simulations are carried out on the self-centering damper to conduct parametric analyses and the finite element simulation results are compared with calculation results of the restoring force model. The research results demonstrate that the residual deformation of the self-centering metal energy dissipation after earthquakes is eliminated by utilizing the elastic restoring force of composite combination disc springs. The damper exhibits full flag-shaped hysteresis curves, confirming that it possesses relatively good self-centering and energy dissipation capabilitiy. The results of finite element simulation are in good agreement with calculation results of restoring force model, validating the established restoring force model can reasonably predict the hysteretic behaviors of the self-centering damper under reversed loading. Finite element analyses also reveal that the initial clearances between members will weaken the self-centering performance of the damper, showing that the members should keep close contact with each other when installed.
关键词
阻尼器 /
自复位 /
抗震性能 /
可恢复功能 /
碟形弹簧 /
有限元
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Key words
damper /
self-centering /
seismic performance /
earthquake resilience /
disc spring /
finite element
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