利用钻孔法估算在役混凝土结构现存预应力

Permanent prestress evaluation of prestressed concrete bridges in-service by hole-drilling method

现存预应力的准确估算对于在役混凝土桥梁结构的可靠性评估具有重要作用.本文在小孔应力集中的理论基础上,首次提出把钻孔法应用于有效预应力的检测中,并通过测试钻孔前后孔边应力的变化,推导出简便近似公式,能够准确有效的实现对预应力的预估.

In order to evaluate the permanent prestress and structure capability of existing prestressed concrete bridges, this paper propose a hole-drilling method to evaluate the permanent prestress based on the principle of little hole method. We analyze the construction stress with the finite element（FE） method and regress an effective equation to predict the permanent prestress.