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在预应力混凝土构件施工实行“双控”时,即“既控制张拉力又控制伸长量”时,要计算预应力钢材的伸长量。在推导考虑摩阻影响的钢束伸长量计算公式时,发现《公路桥涵施工技术规范》(JTJ041-89)所列公式可能有误(请原规范编写者指正)。现提供两种方法供设计施工参考。第一种方法已在设计中应用,效果尚好。
Prestressed concrete in the construction of the implementation of “double control”, that is, “both tension and control elongation”, to calculate the elongation of prestressed steel. When deriving the calculation formula of the elongation of the steel beam considering the influence of friction, it is found that the formulas listed in the Technical Specifications for Construction of Highway Bridges and Culverts (JTJ041-89) may be wrong (please correct the original specification writer). Now provide two methods for the design and construction of reference. The first method has been applied in the design, the effect is still good.