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根据特定震源机制、震级、断层距和场地条件选取69条地震动记录并进行分组,利用Nspectra软件计算隔震结构的弹塑性位移反应谱,分析断层距、场地条件、震级、阻尼比对弹塑性位移谱的影响,探讨隔震层的力学参数对地震能量耗散的影响。研究结果表明:相较于远场,处于近场的隔震结构最为不利,隔震层位移谱值受场地条件、地震加速度和速度大小影响较大;随着断层距的增大,位移谱值衰减较快,且在软土场地中隔震层的位移谱值衰减幅度大于硬土场地;地震震级大小对位移谱形状的影响不明显,但能够使隔震层的位移谱值产生整体缩放效应;阻尼比在小于0.4的范围内,隔震层在不同地震动特性作用下位移谱值差别较大,但在大于0.4以后,位移谱值及谱形基本趋于一致;屈服力较小(恢复力/重力小于等于1)的隔震层随自振周期增大其耗能性能更加突出。
According to the specific focal mechanism, magnitude, fault distance and site conditions, 69 records of ground motions were selected and grouped. Nspectra software was used to calculate elasto-plastic displacement response spectra of the isolated structures. The relationship between fault location, site conditions, earthquake magnitude and damping ratio was analyzed. Displacement spectrum, and discuss the influence of the mechanical parameters of seismic isolation on the energy dissipation of earthquake. The results show that compared with the far field, the isolation structure in the near field is the most unfavorable, and the displacement spectrum of the isolation layer is greatly affected by the site conditions, earthquake acceleration and velocity. With the increase of fault distance, the displacement spectrum The attenuation amplitude of the seismic isolation layer in the soft soil field is greater than that of the hard soil site; the magnitude of the earthquake magnitude has no obvious effect on the shape of the displacement spectrum, but the displacement spectrum of the seismic isolation layer can have the overall scaling effect ; The damping ratio is less than 0.4, the displacement spectrum of seismic isolation layer varies greatly under different ground motion characteristics, but after more than 0.4, the displacement spectrum and the spectrum basically converge; the yield force is small (recovery The seismic isolation layer with force / gravity less than or equal to 1) increases its energy dissipation performance more with the period of natural vibration.