基于总输入能量谱与瞬时输入能量谱的设计谱修正

地震动中的长周期成分对长周期结构的影响不容忽视，现行的设计反应谱为了保证长周期结构抗震设计具备保守性，人为增大了特定频段和特定场地条件的谱值。针对目前设计谱的不足，依据线性单自由度体系的地震动总输入能量谱和瞬时输入能量谱，对规范反应谱5Tg～6s直线下降段提出调整方法。从具有速度 脉冲特征的长周期地震记录中选出能量谱值最大的地震记录加以说明，得到修正后的加速度谱与相应的拟速度谱和位移谱。建议的反应谱修正方法综合体现了总输入能量与瞬时输入能量的特征，对于工程结构设计具有重要的理论意义和实用价值。

The modification method of seismic design spectra according to total and instantaneous input energy

Since the discovery of the long period component in the strong ground motion, it is aware that the influence of long period components on the structures with long periods cannot be ignored. In current design codes, the seismic design for buildings with long periods is conservative, and the values of spectrum are artificially magnified for the specific  frequency range of ground motions and specific site conditions, which conflicts with the actual records of ground motions. In view of the deficiency in current design codes, a modified method is proposed for the design spectra in the range of 5Tg to 6s, according to the seismic input spectra of the total energy and the instantaneous energy for a single degree of freedom system. Based on the actual records of ground motions with long period components which possess the characteristic of velocity pulse, the proposed method is evaluated, the modified acceleration spectrum is obtained, and the pseudo-velocity spectrum and the displacement spectrum associated with the acceleration spectrum can also be attained. The proposed method can reflect the characteristics of the seismic input spectra for the total input energy and the instantaneous input energy, which shall be of theoretical importance and practical application for the seismic design of structures.