The paper makes analysis to lower bracket of rotary crusher on its inner force by regular equation of beam bend, on basis of which strength of lower bracket can be calculated.

用梁弯曲的力法正则方程对旋回式破碎机下架体进行了内力分析，以此为基础可对下架体进行强度计算。

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Different from general raft foundation, the inner force of ribbed beam is calculated as variable section because of the stump.

与一般的筏板基础有所不同，由于有柱墩，有肋梁墩式筏板基础梁的内力需按变截面梁计算。

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