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从受力、变形及刚度等方面分析了闭式机架两种不同的立柱结构，从而论证了在闭式机架中采用拉杆—套筒式立柱的优越性。
From the aspects of force, deformation and stiffness, the two different column structures of the closed frame are analyzed, which proves the superiority of adopting the rod-sleeve column in the closed frame.