中欧抗震设计规范关于地震作用计算参数的比较与换算

Comparison and conversion among calculation parameters of earthquake actions between Chinese and European seismic design codes

首先介绍了欧洲抗震设计标准Design of structures for earthquake resistance(简称欧标)和中国《建筑抗震设计规范》(GB 50011—2010)(2016年版)(简称中规)的抗震设防目标与实现方法,并进行了简单对比,分析了抗震设防目标与地震超越概率的关系。然后基于设计基准期和地震事件发生概率模型,建立了不同超越概率条件下中规和欧标地震动峰值加速度间的相互转换关系式,系统地分析了反应谱主要影响因素及参数的取值方法和相互联系,此外通过工程算例对比分析了中规和欧标在相同外部地震环境下楼层水平地震作用计算结果的差异。结果表明:中规和欧标反应谱理论本质上相同,形式相似,但地震动参数取值方法和依据存在差异;在相同外部地震环境下,依据欧标获得的楼层水平地震作用大于基于中规获得的计算结果,但二者差值百分比分布稳定,具有较好的规律性和可比性。

Firstly,the seismic fortification target and realization method of the European seismic design standard Design of structures for earthquake resistance(for short European standard)and the Chinese Code for seismic design of buildings(GB 50011—2010)(2016 edition)(for short Chinese code)were introduced,and a simple comparison was made,and the relationship between the seismic fortification target and the exceeding probability of earthquake was analyzed.Then,based on the design reference period and the occurrence probability model of seismic events,the inter-conversion relations between the peak acceleration of seismic ground motion of the Chinese code and European standard under different exceeding probability were established,and the main influencing factors of the reaction spectrum and the value method and correlation of the parameters were systematically analyzed.The difference of the calculation results of the story horizontal earthquake action of the Chinese code and European standard in the same external earthquake environment was analyzed and compared by a engineering example.The results show that the response spectrum theory of Chinese code and European standard have the same essence and similarity form,but method and basis of selecting ground motion parameter are difference.In the same external earthquake environment,the story horizontal earthquake action according to European standard is greater than the calculated results based on Chinese code,but the percentage of differences between calculation results is stable,with good regularity and comparability.