挠度法求残余预应力的试验研究

在役预应力构件的残余预应力是反映构件使用安全状况和承载力的参数,用各种规范的设计公式计算残余预应力都有误差。挠度法的现场检测可以求出在役构件的残余预应力,步骤是测量挠度,求出刚度,然后代入残余预应力与刚度的关系式即可计算出残余预应力。文中列出了测量挠度的方法和步骤,刚度的计算也有详细的过程,还给出了试验构件的残余预应力与刚度的关系式。

Research on flexivity method for solving residual prestress

The prestress of existing prestressed structure is a parameter that relates to using security condition and bearing capacity of the structure,calculation results of all types of design formula aren't exact.The prestress value can be calculated by the test of flexivity method on site.The steps are measuring flexivity, solving stiffness,then calculating the prestress by relation of prestress and stiffness.The method of measuring flexivity and steps are given in this paper,the details for calculating stiffness and relation of residual prestress and stiffness are also presented.