| 摘要: |
| 传统金属阻尼器因耗能可靠和价格优势已得到广泛应用. 针对目前大多金属阻尼器存在耗能单一,不能满足不同地震水准耗能要求的问题, 利用U形耗能钢板构造简单、价格低廉、耗能较强等特点,通过组合不同参数的U形耗能钢板,设计了一种分级屈服型金属阻尼器. 通过对两个试件进行低周反复荷载试验、抗疲劳试验,证实了此种阻尼器具有良好的耗能能力和优良的抗疲劳性能. 其骨架曲线呈现明显的分级屈服特征,可在不同强度地震作用下实现分阶段耗能的目标. 等效黏滞阻尼比随位移增大而逐渐增大,最后数值基本稳定在0.43左右,表明阻尼器具有稳定可靠的耗能效果. 刚度退化曲线呈现初期下降速度快、之后逐渐缓慢的趋势. 最后,通过有限元软件ABAQUS对阻尼器试件进行数值模拟,数值模拟结果和试验结果吻合较好. 本研究可为分级屈服型金属阻尼器的研究和工程应用提供参考. |
| 关键词: 金属阻尼器 滞回性能 分阶段耗能 低周反复荷载试验 数值模拟 |
| DOI：10.20192/j.cnki.JSHNU(NS).2024.04.012 |
| 分类号:TU352.1 |
| 基金项目:上海市自然科学基金（23ZR1446500） |
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| Research on seismic performance of U-shaped energy dissipation steel plate graded yield metal dampers |
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LIANG Benliang, ZHANG Qiangheng
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College of Civil Engineering, Shanghai Normal University, Shanghai 201418, China
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| Abstract: |
| Traditional metal dampers were widely used due to their reliable energy consumption and price advantages.Currently, duo to the problem of single energy consumption and not meeting the energy consumption requirements of different seismic levels, a graded yield metal damper was designed by combining U-shaped energy dissipation steel plates with different parameters, taking advantage of the characteristics of simple structure, low price and strong energy consumption of U-shaped energy dissipation steel plates. The results of low cyclic loading test and anti-fatigue test on two specimens showed that this damper had good energy dissipation capacity and excellent anti-fatigue performance. The skeleton curves showed obvious graded yield characteristics, which could achieve the goal of phased energy consumption under different intensity earthquakes. The equivalent viscous damping ratio increase gradually with the increase of displacement, and the final value was basically stable at around 0.43, which showed that the damper had a stable and reliable energy dissipation effect. The stiffness degradation curves showed a tendency that the initial speed declined fast, and then the decline speed was gradually slow. Finally, the finite element software ABAQUS was adopted to simulate the damper specimens, and the results of numerical simulation were in good agreement with those of experiments. A reference could be provided for the research and engineering application of graded yield metal damper by the work in this paper. |
| Key words: metal damper hysteretic behavior phased energy consumption low cyclic loading test numerical simulation |
