The prescriptive method and design manuals for the construction of one - and two - family residential dwellings using cold - formed steel framing have issued in north america and canada , however , all methodss are based on experience and application , but no simplified analytical method is put forward 北美、加拿大等国发布了用于低层( 1 2层)轻钢龙骨结构体系的指导性方法和设计手册，但各国指导性方法均以实践经验为基础、以应用为目的，缺乏简化的整体分析计算方法。
According to the function of system , this system takes overhead crane as an example , overhead crane class is abstracted to demonstrate corresponding object by adopting object - oriented method , design and computing program is to analyse , compute , query and select crane ' s component , database is established to store data of standard parts and components in common use of crane ' s design manual 根据系统所要实现的功能，该系统以桥式起重机为例，采用面向对象的思想抽象出桥式起重机类来表述桥式起重机对象，通过桥式起重机的设计计算程序对起重机各机构进行计算分析和选择查询，数据库部分存储了起重机设计手册中一些常用标准零部件的各种数据。
