基于前期对叠层轮胎隔震垫(STP)热氧老化下力学性能的研究,建立两层砌体隔震结构和非隔震结构模型,采用非线性时程分析法分析经过0、25、50、75及100 a热氧老化后的STP在实际工况下的隔震性能.结果表明,安装了 STP的隔震结构相比于非隔震结构层间剪力降低了44.20％～54.80％,顶层加速度降低了 26.90％～36.50％,且经历不同年限热氧老化后STP仍保持着较好的隔震性能;隔震连接处STP滞回曲线饱满,耗能能力稳定,热氧老化后滞回耗能有所上升.用时程分析法计算出隔震结构在STP老化年限50 a内的平均水平减震系数均小于0.5,可满足《建筑隔震设计标准(GB/T 51408-2021)》中上部结构降低1度进行抗震设计的要求,因此建议STP的安全使用年限为50 a.
Dynamic response of scrap tire pads under thermal oxygen aging conditions
Building on previous research on the mechanical properties of scrap tire pads(STP)un-der thermal oxidative aging conditions,a two-layer masonry isolation structure model and a non-isolation structure model are developed.Then,the seismic isolation performance of STP is ana-lyzed after thermal and oxygen aging for 0,25,50,75,and 100 years using the nonlinear time-history analysis method.Results demonstrate that compared with the non-isolation structure,the interlayer shear force in the isolation structure with STP is reduced by 44.20％—54.80％,and the top floor acceleration is reduced by 26.90％—36.50％.The STP still maintains excellent isolation performance after various years of thermal oxygen aging.Moreover,the hysteretic curves at the isolation joints remain smooth,and the energy dissipation capacity maintains its stability.The hysteretic energy dissipation increases with thermal oxygen aging.The average horizontal damp-ing coefficient of the isolation structure within 50 years of STP aging is below 0.5.According to the Design Standard for Seismic Isolation of Buildings,this condition satisfies the seismic de-sign requirements for a one-degree reduction of the upper structure;therefore,the safe service life of STP is recommended to be 50 years.
万方数据
维普
