摘要
传统金属屈服型阻尼器通常只针对中大震设计,在小震下难以发挥耗能减震作用,且存在震后不易观测实用状态和不便更换等不足。为此提出一种新型金属套管阻尼器,利用具有不同屈服性能的钢条分别耗能,具有多级屈服功能。考虑耗能钢条两端半刚性节点的影响,推导并得到该阻尼器的性能参数计算公式。对阻尼器进行拟静力试验,明确该阻尼器的破坏特征和耗能机理。对试验进行有限元精细化模拟,通过应力云图验证阻尼器具有多级屈服特性。将理论计算、试验及有限元模拟得到的性能参数进行对比。结果表明,该阻尼器有效实现了分级屈服的设计目标,并具备良好的耗能能力,提出的性能参数计算公式精度较高,通过理论计算和有限元模拟得到的阻尼器性能参数与试验结果吻合较好,验证有限元模型的合理性和精确性。
Conventional metal yielding dampers are usually designed only for medium and large earthquakes,which are difficult to dissipate energy under minor earthquakes. It is also difficult to observe the practical state after an earthquake and is inconvenient to replace them. A new metal tube damper is proposed. The steel strips with different yielding properties can dissipate energy separately, thus exhibiting a graded yielding behavior.Considering the influence of the semi-rigid joints at both ends of the strips, the performance parameters calculation formulas of the damper are derived. Quasi-static tests of the damper were carried out to reveal its failure characteristics. Refined finite element simulation of the specimens is carried out. The graded yielding characteristics of the damper are further verified by the stress nephogram. The performance parameters obtained from theoretical calculation, experiment and finite element simulation are compared. The results show that the damper could effectively achieve the design goal of graded yielding and has good deformation capacity and energy dissipation capacity. The accuracy of the performance parameter calculation formulas is high. The performance parameters of the damper obtained by the theoretical calculation and the finite element simulation are in good agreement with the experimental results. The rationality and accuracy of the refined finite element model are verified.
作者
吴山
何浩祥
兰炳稷
陈建伟
WU Shan;HE Hao-xiang;LAN Bing-ji;CHEN Jian-wei(Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China;College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China)
出处
《工程力学》
EI
CSCD
北大核心
2022年第7期147-157,共11页
Engineering Mechanics
基金
国家自然科学基金项目(51878017)。
关键词
金属阻尼器
分级屈服
拟静力试验
力学性能
耗能减震
metal damper
graded yield
quasi-static experiment
mechanical performance
energy dissipation
