日本钢桥建筑的近期发展趋向-----道桥方向外文翻译.docVIP

Considerations on recent trends in, steel bridge construction in Japan Abstract In this paper, consideration is given on recent trends in, steel bridge construction in Japan. As far as recent trends are concerned, it is observed that the construction of long and big steel bridges has practically been completed. Consequently, the focus of recent main works is the maintenance of superannuated (averaged) bridges and the seismic retrofitting of existing bridges. The refreshment and regeneration of some superannuated bridges is also needed recently in order to mitigate the uncomfortable influence of these bridges on their surrounding environment. For this purpose, maintenance and retrofitting works should be economically reasonable jobs. The necessity and importance of these works should be understood by the nation through retrofitting existing bridges against disasters and mitigating the unfavorable influence of bridge structures on the bridge environment on the basis of the code of ethics for civil engineers promulgated by JSCE. Moreover, bridge engineers should seek better social status and the bridge engineering field should become attractive to young students who will bear the future of this field. 1.1 Construction trend In Japan, many bridges were intensively constructed in the 1960s–80s, during the period of high economic growth, with the number of bridges constructed per year decreasing recently to half of the overall peak. More specifically, the steel bridge industry reached the golden age in the latter half of the 1960s. However, the latest data indicates that the recent number of constructed steel bridges has declined to approximately 40% of its peak, though the number of constructed RC and PC bridges remains almost constant from the beginning of 1960 to date. After the construction of many bridges as one of the important infrastructures, bridges were constructed predominantly in places of direct need. Recently, it is observed that various kinds of damage h