震损建筑抗震鉴定加固中地震作用取值研究

在震损建筑抗震鉴定加固中，有关地震作用取值如何调整是值得深入研究的问题。以均匀Poisson过程描述地震的概率模型，以极值分布反映地震作用的概率分布，给出了地震烈度、地面峰值加速度与水平地震影响系数最大值之间的换算关系及其危险性曲线公式；阐释了等设防烈度原则、等超越概率原则和等重现期原则的基本原理；列出了震损建筑的几种分类方法及类别。基于震损建筑的后续使用年限，提出采用等重现期原则调整其地震作用取值的办法，并列出了具体的计算步骤。研究表明：相比等设防烈度原则和等超越概率原则，等重现期原则更为合理地反映了震损建筑在后续使用年限内遭遇相当设防烈度地震的风险概率，因此更适用于震损建筑抗震鉴定加固中地震作用取值的调整。

Research on earthquake action for seismic appraisal and retrofit of earthquake-damaged buildings

For the earthquake-damaged buildings, it is quite necessary to do research on adjustment of earthquake action in their seismic appraisal and retrofit. The earthquake generation model was established based on the Homogeneous Poisson Process, and the probability distribution of earthquake action was embodied by Extreme Value Type (Ⅱ and Ⅲ), then the conversion relation among seismic intensity, peak ground acceleration(PGA) and maximum horizontal earthquake influence coefficient were obtained, as well as their own seismic hazard curve formulas. Moreover, the basic principles of equal precautionary intensity, equal exceeding probability and equal return period were illustrated respectively, and several categories of earthquake-damaged buildings were listed with different classification principles. In the end, based on the continuous seismic service life of earthquake-damaged buildings, an available approach according to equal return period principle was proposed to modify the corresponding earthquake action, and the main steps were given here. Based on comparative research, it is concluded that the equal return period method is more reasonable than the equal precautionary intensity method and the equal exceeding probability method to reflect the risk of earthquake-damaged buildings reencountering similar precautionary earthquakes in their continuous seismic service life, and therefore it can be more appropriately used to modify the earthquake action for seismic appraisal and retrofit of earthquake-damaged buildings.