The a value and correlative length coefficient by back calculation are obtained in this paper.

同时给出了在此种条件下的阈值刚度和柱子的计算长度系数的表达形式。

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For weak bracing system, this paper provided the concrete formula of calculating the effective length coefficient of column.

对弱支撑体系，提出了柱子计算长度的实用计算公式。

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