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为定量评估余震对主震损伤结构所造成的二次损伤,该文对主余震序列型地震动的增量损伤谱进行了研究。挑选533条真实主余震序列作为输入,采用Park-Ang(1985)损伤指数定义地震损伤,通过计算结构在主震和主余震序列作用下的损伤差值,定量评价余震对结构所造成的增量损伤。研究结果表明:余震对主震损伤结构所造成的增量损伤的变异性较强。某些主余震序列会对结构造成非常显著的增量损伤,而某些主余震序列却不会对结构造成明显的增量损伤。相比于短周期结构,中长周期结构在主余震序列作用下的增量损伤更大。若主震卓越周期高于余震卓越周期,则该主余震序列可视为不利主余震序列,对结构可能造成较大增量损伤。
In order to quantitatively evaluate the secondary damage caused by aftershocks to the damage structure of the main shock, this paper studies the incremental damage spectrum of the main aftershock earthquake sequence. 533 real main aftershock sequences were selected as inputs, and the damage index was defined by Park-Ang (1985) damage index. By calculating the damage difference between the main and main aftershock sequences, the structure increment caused by aftershocks was quantitatively evaluated damage. The results show that the aftershocks have strong variability of the incremental damage caused by the damage structure of the main shock. Some main aftershock sequences cause very significant incremental damage to the structure, while some main aftershocks do not cause significant incremental damage to the structure. Compared with the short-period structure, the long-period periodic structure increases the damage under the action of the main aftershock sequence. If the mainshock superior period is higher than the aftershock period, the main aftershock sequence can be regarded as an adverse main aftershock sequence, which may cause greater incremental damage to the structure.