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。
The program system DDDU for actual design of engineering structures composed of bar, diaphragm, beam, shell, etc. is introduced.
实测资料表明，上下行并行的钢板梁桥在采用“两桥连接”加固以后，平联杆件的弯曲变形和断裂现象急剧增多。
Measured results indicate that the bend deformation and abruption phenomenon appears very quickly when the "two-bridge-junction" method is adopted in the parallel steel plate beam.
整个结构划分为若干组合单元，每个组合单元包括拱、桁梁及竖杆横撑架三部分。
The structure is resolved into several compound elements and every compound element consist of three parts: arch, trussed beam and lateral brace.
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