| With the development of the material behavior and bridge construction technology, the bridge span become more and more long, and the box girder beam becomes the first-choice of many bridges because of its excellent performance.With the many use of box girder, however, many kinds of cracks have become the serious problems and also focus in the academic and engineering field. Based on the results of many materials collecting from lots of existing bridges and summarizing of the achievements given before, a theory analysis and computer simulation to the unknown cracks of the reinforced concrete box girder has given in this thesis. Based on the analytical method of "time depending on" and "the whole bridge life", the theory analysis and computer simulation methods are given in this papere. The main works in this paper are as follows:1. The cracks existed in 23 bridges and the research works by other people have been analyzed. Based on above works, the cracking trend with general significance, that is to say, the cracking risk in construction period is far greater than service period has been found.2. A simulation analysis method to the bridge construction steps has been given, based on the "time depending on" theory. Both the broad sense "time depending on" and the narrow sense "time depending on" are discussed. By analyzing a continuous rigid frame bridge with Midas/civil, the reason of cracking in concrete, which can not be explained from the designing methods, has been found.3. To a deterioried bridge to be detected, the existed cracks have been analyzed and a basic bridge health detecting method has been put forward.4. Based on the needs of detecting and evaluating of the bridge, the primary content and the overall design of the smart evaluating system about bridge health detecting have been put forward. The market prospects and technical feasibility have been analyzed, and the research on the relevant computer simulation system has also been done primarily. |
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