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本文利用振动测试方法，结合结构动力学原理，提出了测试受力钢筋内力的实用公式，并通过试验对公式进行了验证。利用该公式，由实测的结构振动特性反演得到预应力筋的实际内力。为预应力筋的加固效果鉴定，提供了有力的科学依据。此方法已在本钢等厂房鉴定中运用，被证明是一种较经济、实用、方便的方法。同时，本文提供的实用公式对于类似于弦索的结构及预应力钢结构都可应用
In this paper, using the vibration test method, combined with the principle of structural dynamics, a practical formula for testing the internal force of the stressed steel reinforcement is proposed, and the formula is verified by experiments. Using this formula, the actual internal forces of the prestressed tendons are derived from the measured structural vibration characteristics. It provides a strong scientific basis for the identification of reinforcement effects of prestressed tendons. This method has been used in the appraisal of the workshops such as Benxi Steel and has proved to be a more economical, practical and convenient method. At the same time, the practical formulas provided in this paper can be applied to structures similar to chords and prestressed steel structures.