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介绍了大型岩石基底摩擦试验机的组成和顶框架的结构，分析了顶框架的侧框架、立柱和顶部网格梁的受力情况，提出了设计原理．
The composition of the large rock friction tester and the structure of the top frame are introduced. The force of the side frame, the column and the top grid beam of the top frame is analyzed, and the design principle is put forward.