以京九线赣江桥为例，介绍了基于断裂力学的既有铆接铁路钢桥剩余寿命评估的原理与方法。

Through the example of Ganjiang bridge on Jing-jiu railway line, the fracture mechanics model applied to evaluate the remaining fatigue life of existing riveted railway Bridges is investigated.

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铁道部已经指示63列火车绕开无法运行的区段，改由京九线或是上海到昆明的铁路线来运行。

The Ministry of Railways has instructed 63 trains to bypass the non-operational section and take different routes via the Beijing-Kowloon Railway Line or Shanghai-Kunming Railway Line.

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进而介绍了由于设计、施工等几种常见的可能引起框架桥产生裂缝的原因，并以京九线某里程段的二孔框架桥出现裂缝情况为例分析了其出现裂缝的原因及裂缝的危害性。

The author took the crack case of one of two-hole frame bridges in the Jingjiu Railway Line as an example to analyze the reasons of its crack and the danger of crack to the sa.

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