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ＰＣ（ＰｒｅｓｔｒｅｓｓｅｄＣｏｎｃｒｅｔｅ）钢筋在施加预张应力时，镦头根部发生断裂是目前钢筋使用中出现的主要问题．力学测试和组织分析表明，镦头根部断裂的主要原因是镦头加热过程中钢筋强度降低，钢筋使用中的一些不规范行为造成钢筋长度上的差异，导致一组钢筋中各钢筋之间应力分配不均匀．当镦头根部的抗拉强度衰减至低于母体材料屈服强度以下，并且钢筋使用时一组钢筋长度上的差别超过钢筋局部伸长量时，由于钢筋失去利用均匀变形调整各钢筋间的应力分配的能力，而造成超载的钢筋早期断裂．
PC (PrestressedConcrete) rebar In the application of prestressing stress, the head of the broken head is the main problem in the current use of steel. Mechanical test and microstructure analysis show that the main reason of head root fracture is the decrease of the strength of the steel during the heating process of heading head and the difference of the length of the steel rod caused by some non-standard behavior in the use of steel bars, resulting in the stress distribution among the reinforcing bars Inhomogeneous. When the tensile strength of heading root decay below the yield strength of the parent material and the difference in the length of a set of reinforcing bars exceeds the local elongation of the reinforcing bars, the stress distribution between the reinforcing bars is adjusted due to the loss of the reinforcing bars due to the loss of uniform deformation The ability to cause overloading of steel early rupture.