桥架的金属结构由主梁和端梁组成，分为单主梁桥架和双梁桥架两类。
Bridge's metal structure from the main beam and side beams, divided into single-and dual-beam bridge girder bridge types.
介绍了基于系统分析的双梁桥式起重机桥架结构优化设计方法。
This paper introduces an optimization design method for overhead traveling crane structure with double bridge which is based on system analysis.
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