Combined with construction project of prestress construction of prefabricated box beam, the paper introduces the calculation method of steel strand theoretical elongation value and measurement, and shrinkage losses.% 本文主要结合预制箱梁预应力施工工程实例,介绍预应力施工中钢绞线理论伸长值的分段计算方法,现场施工中钢绞线伸长量的量测与回缩损失。
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