论文部分内容阅读
地震烈度作为一种总的综合性的分级办法,是不能简单地用一个或若干个参数来度量的,因为根据不同的参数会得出不同的结果。本文建议将被评定的地震烈度视为烈度论域上的一个模糊子集,并利用模糊数学中模糊推论和综合评判的理论,提出了地震烈度的多因子综合评定的方法。所考虑的评定因子包括震害指数、地面水平加速度峰值,速度峰值和竖向加速度峰值。当条件成熟时,还可以毫无困难地增加其他评定因子,例如地震持续时间、谱特性等。显然,这种多因子模糊综合评定的方法远优于目前采用的单因子“确界”评定方法。 本文还提出了利用所求得的烈度模糊向量的各隶属度来决定结构设计中应取参数值的方法,从而避免了设计参数成倍突变的缺点。
Seismic intensity as an overall, comprehensive grading method cannot simply be measured with one or several parameters, because different parameters result in different results. In this paper, we propose that the seismic intensity to be assessed be regarded as a fuzzy subset in the intensity domain. Using the theory of fuzzy inference and comprehensive evaluation in fuzzy mathematics, a multi-factor comprehensive assessment method for seismic intensity is proposed. The assessment factors considered include the earthquake damage index, the ground horizontal acceleration peak, the speed peak, and the vertical acceleration peak. When conditions are ripe, it is also possible to increase other evaluation factors without difficulty, such as earthquake duration, spectral characteristics, and the like. Obviously, this multi-factor fuzzy comprehensive assessment method is far superior to the single-factor “accuracy” assessment method currently used. This paper also proposes the method of using the degree of membership of the obtained intensity fuzzy vector to determine the value of the parameter that should be taken in the design of the structure, so as to avoid the defect that the design parameter is doubled.