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在钢桁梁的落架计算中，往往对温度影响考虑的较多，而对施工荷载和部分恒载所引起的梁长变化有所忽视，有些设计中对此未予说明，结果使落架受到影响。我们在京九线吉安赣江特大桥和浙赣线尖山江大桥就遇到了这样的问题。通过这两座桥的施工，笔者深深体会到，荷载对梁长的影
In the calculation of the fall of steel truss girders, the influence on temperature is often taken into consideration while the change of beam length caused by construction load and part of deadweight is neglected. In some designs, this is not explained, which affects the undercarriage . We encountered this problem on the Ji’an-Ganjiang River Bridge and the Jianshanjiang Bridge on the Zhe-Gan Line in the Beijing-Kowloon Railway. Through the construction of these two bridges, I deeply understand that the load of the shadow of the beam