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.
在中国地震烈度表上，对人的感觉、一般房屋震害程度和其他现象作了描述，可以作为确定烈度的基本依据。
China's seismic intensity on the table, the people the impression that the general level of damage to housing and other phenomena described, can be used as the basis for determining intensity.
指出除基本烈度地震以外，另外两个水准的概率含义是不明确的，只能从平均意义上去理解。
It is pointed out that except basic design earthquake intensity the probabilistic definition of the two levels of earthquake protection is ambiguous that can only be understood in average meaning.
然后对结构在基本烈度和罕遇烈度地震作用下的抗震性能进行评估。
Then, the paper evaluated the anti-seismic performance of the structure under basic and rare earthquake intensity.
分析结果表明，结构在小震及设防烈度地震作用下基本处于弹性状态，在罕遇地震作用下主结构能够保持较好的工作状态。
The results show that the structure is elastic under frequent earthquake and inter-mediate earthquake and the main structure has good performance under rare earthquake.
分析结果表明，结构在小震及设防烈度地震作用下基本处于弹性状态，在罕遇地震作用下主结构能够保持较好的工作状态。
The results show that the structure is elastic under frequent earthquake and inter-mediate earthquake and the main structure has good performance under rare earthquake.
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