摘要
超设计特大地震下,橡胶支座的力学模型对结构响应的影响在东日本大地震后得到了广泛的关注;在双线性模型的基础上提出了一种适合铅芯橡胶隔震支座在大变形条件下的非线性硬化模型,该模型考虑了支座硬化后的刚度退化现象以及压应力对于卸载曲线的影响。通过两组试验数据来验证模型的准确性,并得出屈服刚度与最大剪切应变之间的关系;采用数值分析方法研究隔震支座在特大地震下进入硬化后核电厂结构的地震响应。研究表明相比双线性模型,核电厂结构采用硬化模型计算得出剪切力和加速度都出现显著增加的现象,且在特大地震下隔震效果有所衰减。
The effect of the mechanical model of isolation bearings on structural seismic responses under a severe earthquake excitation exceeding the disigned value is widely concerned after the East Japan earthquake. An analytical nonlinear hardening model for lead rubber bearings（ LRB） in the condition of large deformation,based on a bilinear model,was proposed. The descending of yielding stiffness after hardening and the influence of vertical load on unloading curves were both considered in the model. To confirm the validity of the model,analyses were performed on two sets of actual static loading tests data of the LBRs. The correlation between the yielding stiffness and the history of maximum shear deformation was also developed in the tests. Analyses using the new model were conducted to demonstrate the seismic responses of base-isolated nuclear power plants in the condition of large shear deformations of isolation bearings. The study indicates that the shear force and acceleration of nuclear power plant structures predicted by the new model increase obviously compared with those by the bilinear model. It also shows that the isolation effect will decline under severe earthquakes.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第18期85-90,共6页
Journal of Vibration and Shock
基金
国家自然科学基金项目(51278291
51478257)
教育部博士点基金项目(20133108110024)
关键词
核电厂
铅芯橡胶支座
特大地震
硬化模型
大变形
nuclear power plants
leading rubber bearings
severe earthquake
hardening model
large deformation
