Development of Method of Improving Inspectabilty of Existing Steel Girder Bridges

目的是提高钢桥端横梁的可检测性。有限元法是中流砥柱，但全桥分析是一项不可逾越的任务。因此，首先建立端横梁模型。由于端横梁非常容易受到腐蚀，腐蚀对端横梁的承载能力的影响进行了调查，显示腐蚀可以大大恶化的承载能力。为了预防，检查是必不可少的，但在许多桥梁，这是不容易的，因为端横梁是如此接近护栏。在本研究中，一个检查孔的设置被认为是解决这个问题。为此，检查孔的承载能力的影响进行了研究。研究发现，不仅尺寸和形状，而且位置的承载能力的影响。加固方法，然后调查，并揭示其有效性。

The objective is to improve the inspectability of an end cross girder of a steel bridge. The finite element method is the mainstay, but the analysis of the whole bridge is an insurmountable task. The end cross girder model is therefore constructed first. Since the end cross girder is very susceptible to corrosion, the influence of corrosion on the load-carrying capacity of the end cross girder is investigated, showing that the corrosion can deteriorate the load-carrying capacity considerably. For the prevention, inspection is essential, but in many bridges it is not easy as the end cross girder is so close to a parapet. In the present study, the setup of an inspection hole is considered to solve the problem. To this end, the influence of an inspection hole on the load-carrying capacity is studied. It is found that not only the size and the shape but also the location influences load-carrying capacity. Reinforcement methods are then investigated and their effectiveness is revealed.