摘要
基于弹塑性力学的基本原理,提出一种新型恢复力模型,可用于模拟消能减震体系中的金属阻尼器。新模型采用指数函数的形式定义屈服面随塑性变形的演化过程,能更好地反映金属阻尼器在屈服后承载力增长速度随塑性变形增加而不断减小的非线性过程,同时,分别采用两个随动强化分量和两个等向强化分量以评估阻尼器在往复小变形与往复大变形情况下的强化行为,提升了模型对各类工况下阻尼器模拟的准确性。进一步地,将文献中各类金属阻尼器的试验结果与文中模型的预测结果进行对比,结果表明,新型恢复力模型可以准确地预测不同形式、不同材料和不同加载制度下金属阻尼器的复杂行为,具有极强的通用性,可用于工程实践中各类金属阻尼器的模拟。
Based on the basic principles of elastoplastic mechanics,a new restoring force model for the metallic dampers in energy dissipation structure systems was developed.In the new model,the exponential function was utilized to simulate the evolution process of the yielding surface with the increase of plastic deformation,so that the model can accurately predict the nonlinear growing pattern of the restoring force after the yielding of the damper.Additionally,two isotropic hardening variables and two kinematic hardening variables are applied to evaluating the hardening behavior of the damper under cyclic small and large deformations,which extends the applicability of the restoring force model for the metallic dampers under large deformations.Furthermore,test results of numerous metallic dampers collected from literature were compared with the simulation results of the new restoring force model,and the results disclosed that the new model can accurately predict the complicated cyclic behavior of metallic dampers in different forms,made of different materials and under different loading protocols,validating that it is suitable for the simulation of metallic dampers.
作者
吴桢灏
庄亮东
黄远
Wu Zhenhao;Zhuang Liangdong;Huang Yuan(Hunan University,Changsha 410082,China;School of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education,Tsinghua University,Beijing 100084,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第7期45-54,共10页
China Civil Engineering Journal
基金
国家自然科学基金(51890901)。
关键词
金属阻尼器
恢复力模型
数值模拟
等向强化
滞回曲线
metallic damper
restoring force model
numerical simulation
isotropic hardening
hysteretic curves
