For a truss with more than one redundant bar, more than one release will be required to obtain the primary frame .

对于有一个以上多余杆的桁架要得到基本体系，就要放松一个以上的约束。

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Primary frame made of steel columns and beams.

主钢构由钢柱和钢梁组成。

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Primary frame made of steel columns and beams.

主钢构由钢柱和钢梁组成。

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