Analysis of Fatigue Fracture Accidents of Welded I-beam Bridges, Key Technology and Demolition Method in Australia

When Germany built Bendorf Bridge over the Rhine River, the cantilever pouring construction method was adopted, and the cantilever pouring method and cantilever assembly construction method were adopted. The continuous improvement, innovation and perfection of the method make this method widely used. At present, our country has made rapid progress in science and technology. New changes have been made in the prestressed design of concrete Bridges, as well as in the analysis and testing of structures, as well as in materials and processes. Great progress has been made in the design and construction of prestressed concrete Bridges.

In the construction of continuous steel Bridges, the width and weight of block 0 are changed with the size of the bridge span, for example, the higher the pier of the bridge built over the river valley, the more difficult the construction. When the two are put together, it will become the most important part of the construction, so the construction personnel should be extremely concerned about it. For the construction of No. 0 block, the following two construction processes are generally adopted, one is the support method. The second is the bracket method. Among them, the support method is divided into two kinds, respectively: full support and steel pipe pile support.

The bracket method involves a little more variety, the most important of which are: welded ox legs, embedded Beret pieces and counterthreading I beam method. In these construction methods, the I-beam method has been widely used, and its main advantages are that its bracket steel is tough, fast construction and wide range of application. Based on this, this paper studies the fatigue fracture accidents of welded I-beam Bridges in Australia for reference.