现有建筑抗震鉴定地震动参数取值研究

Study on the Ground Motion Parameters for Seismic Appraisal of Available Buildings

现行抗震鉴定标准的抗震设防目标是要使现有建筑在后续使用年限内与新建工程的设防目标具有相同的概率保证,即要实现与不同的后续使用年限对应的三水准设防目标,但地震作用的计算却不能很好地实现不同后续使用年限的抗震设防目标具有相同概率保证。本文在地震危险性分析的基础上,利用地震动参数的危险性曲线公式对不同后续使用年限的现有建筑地震动参数进行分析,给出与现行抗震设计规范具有相同概率保证的不同后续使用年限不同设防水准的地震动参数取值,并给出实用的简化计算方法。

The seismic fortification target in Standard for Seismic Appraiser of Building（ GB 50023—2009） is aimed to ensure that the seismic fortification target of available buildings with different seismic continuous working life have the same probability,but the calculation of earthquake action cannot well achieve this aim. Based on earthquake hazard analysis,the values of the ground motion parameters for different seismic continuous working life are presented by using of hazard curve formulas of ground motion parameters. And the practical and simplified method is put forward.