The hierarchy of class base is described, then, the definition and the usage of the class of ground, the class of foundation design, the class of parameter and the class of section design are discussed.

• 文中具体描述了规范知识库类等级关系的设计 ,给出了土层参数类、基础设计类、以及相关参数类、截面设计类等的类定义及其使用方法。