For the earthquake resistant analysis of actual engineering structures, most of structural systems have the properties of non-proportional (non-classical) damping, I.
在实际工程结构的抗震研究中，一般结构体系都具有非比例阻尼特性。
The program system DDDU for actual design of engineering structures composed of bar, diaphragm, beam, shell, etc. is introduced.
本文介绍了对由杆、膜、梁、板壳单元组成的工程结构可进行实际设计的程序系统DDDU。
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