For supporting leg with varying cross section, it is necessary to calculate equivalent inertia moment prior to calculating internal force of plane frames.
对于变截面支腿，用力法计算平面框架内力时要先计算折算惯性矩。
For supporting leg with varying cross section, it is necessary to calculate equivalent inertia moment prior to calculating internal force of plane frames.
对于变截面支腿，用力法计算平面框架内力时要先计算折算惯性矩。
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