钢绞线断裂是预应力损失的一个重要因素。我国中核集团公司自主设计的第三代核电技术“华龙一号”安全壳结构采用倒“U”型钢束形式,但目前尚没有倒“U”型钢束断裂引起混凝土预压应变损失的解析方法,这给预应力损失的评估带来了盲目性。鉴于此,通过理论推导求解了倒“U”型灌油或灌蜡钢束发生断丝后,钢束周边混凝土预压应变的变化幅值。 Strand breakage is an important factor in the loss of prestress. China Nuclear Group Company independently designed third-generation nuclear power technology, “Hualong One” containment structure using inverted “U ” type steel beam form, but there is no down “U ” type steel beam fracture caused by concrete preloading Strain loss analysis method, which brings the blindness of the assessment of prestress loss. In view of this, through the theoretical derivation, the change amplitude of prestressing strain of concrete around the steel beam after the broken “U” type oiling or filling wax beam was broken was solved.