【導讀】根據最新的橋梁結構形式，本文旨在介紹如何建設美好的剛結構橋梁。需要查點和利用橋梁周圍的再生環(huán)境。減輕和消除橋梁的不利因素及危害。好的社會地位，并成為承擔和建設這一領域的支柱和未來。明石海峽大橋跨度為1991米，它是世界上最長的吊橋。而最長的斜拉橋電。纜多多羅，主跨長度為890米，是跨海連接本州和四國島的航線之一。是，相對于發(fā)達的日本在建設橋梁方面，需要更多的技術和基礎設施。沒有被視為一個重要的工業(yè)部門，仍然是一個挑戰(zhàn)。雖然，RC和PC橋梁建造項目幾乎保持不變，但是鋼。橋梁建設已下降到40%。礎設施已經產生了多種病害。大橋抗震改造工程目前正在進行中，總預算為6000萬日元，工期為5年。橋梁的加固、維修和維護，將成為日本未來的鋼橋市場中重要的組成部分。通過自習分析當前發(fā)展趨勢，日本鋼結構橋梁應該有條不紊的向前發(fā)展。華，尤其是地震多發(fā)國家。更重要的是，我們能夠吸進和留住世界各地最優(yōu)秀的員工和學生”，日本

　　

【正文】 attract young people, in order to bee successful students and bridge engineers who will develop and support the industry in the future. (6) Bridge engineers should make the code of ethics for civil engineers promulgated by JSCE public and adhere to it, in order that the current bridge engineering industry may achieve the targets mentioned above and obtain better status in Japanese society. (7) It is necessary for bridge engineers to develop technologies applicable to not only bridges but also structures in other industries, because they can win jobs from other industries by using the technologies developed in such a way. (8) The safety of bridges, in particular against natural disaster, is still the most important central task, although the improvement and refreshment of existing bridges 11 taking account of the bridge environment is important. (9) Preservation of old bridges is also very important, so that current and future generations may understand the history and importance of bridges. . Refreshment of bridge environment To establish a desirable bridge environment, it is also important to mitigate the unfortable influence of the bridges on their surrounding environment. The most important factor in order to realize a desirable bridge environment is effective munication among the people concerning the bridge environment, such as bridge engineers, researchers, users and other relevant people to the bridge and the conservation of the natural environment, and habitants and workers near the bridges. The design, construction, and maintenance of almost all the bridges has so far been carried out considering mainly their safety, with less emphasis on munication among people until recently. In the near future, in order to create a desirable bridge environment and/or change the current bridge environment to a desirable one, it is considered that a new organization is necessary. This should offer a framework which promotes munication among the people, and hence enables stakeholders to find out valuable and useful strategies and to investigate and develop core technologies necessary to solve many issues related to the bridge environment. For this purpose, the author and his group are investigating the brief organization of a centre on bridge safety and environment. This centre is a place to municate, to exchange information and to collaborate among the people concerned with the bridge environment in order to realize a desirable bridge environment. The key features of the centre are as follows: (1) The centre should be independent from all the organizations concerned with the bridge and the bridge environment. (2) The policy of the centre is not against the code of ethics for civil engineers promulgated by JSCE. (3) In particular, regional characteristics should be emphasized, because of tight munication, quick correspondence etc. The centre should be established in each domestic region, for example, in our case, the centre should be established in Osaka. (4) Domestic and international collaboration with other similar centres is considered to be one of the important objectives of the centre. (5) It is also important to develop new research fields, which are concerned with the core technologies to solve the various kinds of issues on bridges and their bridge environment. . Importance of bridge safety The safety of bridges, in particular against natural disaster, is still important for bridge engineers, although the improvement and refreshment of existing bridges considering the bridge environment is equally important. Because bridges are one of the important elements of infrastructure supporting our everyday social activity, the collapse of bridges due to strong seismic action, floods and so on has the potential to stop our social activity pletely and for a long time. For instance, the collapse and serious damage to many elevated bridges in the Kobe Line of Hanshin Express Highway due to the HyogoKen Nambu Earthquake stopped the Kobe Line and caused heavy traffic 12 jams for about one year. The bridge industry is responsible for the safety of the bridges. 4. Concluding remarks In this paper, consideration is given to the bright future in steel bridge construction in Japan through the investigation of recent trends. The state of the art in bridge construction during the developing and fairly developed eras, and the issues related to a bright future in steel bridge construction in Japan could be useful to various other countries, including in particular earthquake prone countries finding themselves at different stages of bridge infrastructure development.