本文介绍了D_（18A）型凹底平车全封闭式大底架结构刚度、强度的计算和试验结果，对与此有关的若干问题进行了分析。
This paper tells the calculation and test results of the rigidity and strength of all-closed large underframes on depressed centre flat cars D18A. Several problems concerned are analyzed.
分析结果为大吨位铁路起重机底架的设计与改造提供了理论依据。
The thesis forms a theory base for the design and improvement of the carrier frame.
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