框构桥裂缝产生的原因及结构安全性分析

Analysis of reasons for the crack on frame bridge and the structural safety

本文首先介绍了框架桥的应用情况,指出框架桥结构是铁路提速后,大规模使用的一种下穿结构形式。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 firstly expounded the applications of frame bridge, and then pointed out that frame work is one of the down through structures adopted on a large scale during railway speed rising. Next the author set forth several possible frequent reasons of causing crack of frame bridge, especially the factors of design and construction. 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 safety.