为此，提出了灰色地震烈度，场地灰类、结构工作正常度以及结构灰色可靠度等概念及其计算方法。
For this purpose, the concepts on grey earthquake intensity, grey classification of site soil, normality degree of the working of structures and grey reliability of structures are defined.
地震基本烈度是指某地区今后一定时期内，在一般场地条件下可能遭受的最大烈度。
The basic seismic intensity of a region is defined as the maximum intensity to be suffered within a given interval of time in the future under the site condition of that region.
我国现行抗震设计规范中给出的反应谱依赖于两个参数，即地震烈度和场地土类别。
The response spectrum given by present design standards depends on two parameters, i. e. earthquake intensity and site classification.
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