在印度，有许多修建于８０～１２０年以前的铁路钢桥，其中很多目前正在进行更换，而未能更多考虑技术需要和经济性。在过去１５年，现场观察结果并未说明钢梁受到任何严重损伤。疲劳试验结果也说明，它们还有相当长的残余寿命。与其更换，倒不如继续使用为好。本文给出了一种是否需要换梁的判断方法。 In India, there are many railway steel bridges built 80 to 120 years ago, many of which are currently undergoing replacement and fail to give more consideration to technical needs and economy. In the past 15 years, field observations did not indicate any serious damage to the steel beams. Fatigue test results also show that they still have a long residual life. Instead of replacement, it is better to continue to use as well. This article gives a judgment of whether to change the beam.