地震环境下不同重要性建筑的抗震设防水准

Seismic design levels of building structures with different importance factors in consideration of earthquake environment

针对我国进行建筑物重要性分类时没有考虑地震环境影响的现实,采用地震危险性分析的方法将我国划分为地震危险性不同的3个区。同时,在采用调整设计基准期来标定建筑的重要性类别的基础上,利用地震动参数的危险性曲线,分析了不同重要性建筑在不同危险性特征分区内、不同设防概率水准(常遇、偶遇、罕遇地震)下的地震动参数(设防烈度、地震影响系数和地震地面运动加速度)的取值,最终证实调整结构的设计基准期并考虑地震环境的影响是标定结构的重要性从而调整设防等级的一种好方法。

The influence of earthquake environment is not considered during classifying importance of building structures in China. In this paper, the whole range of China is classified as three zones with different seismic hazard characters by the method of seismic hazard analysis. At the same time, the service period of buildings is recommended to demarcate importance of buildings. Then, according to the seismic hazard curve formulas of various ground motion parameters, the ground motion parameters at the three design levels of the buildings with different importance are analyzed in consideration of various seismic hazard characteristics of the region where buildings located. The research indicates that this method can correctly reflect importance of the buildings.