DITA体系结构的主要特性。
介绍了该体系的结构特点、初始预张力确定、动力特性、荷载作用下的力学性能，以及主要节点构造等。
The structural features of the system, determination of initial pre-tension, dynamic functions, mechanical behaviors under load and the construction of main nodes, are introduced.
协作体系的动力特性主要包括体系的自振频率和主振型，它是协作体系结构动力分析的基础和前提。
Dynamic characteristics of collaborated system mainly include natural vibration frequency and principal mode, which is the base and precondition of dynamic analysis for collaborated system.
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