【摘要】 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更多还原

【Abstract】 in the paper, practical formulas for calculating the internal force of pre stress bar is presented by using vibration test data combined with structural dynamic analysis. The pre stress bar′s real inter force is obtained by solving an inverse problem of structural vibration. The method lays a scientific foundation of inspection of factory buildings and has been adopted in building examination in Benxi steel corporation. Good results were obtained, which shows its economy, practical bility and convenience in use. It can be also used in cable structure or pre stresed steel structure.更多还原