外文翻譯---日本鋼橋建筑的近期發(fā)展趨向-建筑結(jié)構(gòu)-文庫(kù)吧資料
2025-05-22 09:29本頁(yè)面
【正文】 ar the future of this field. 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 have occurred to many bridges mainly constructed in the 1960s. Especially following the investigation of damage to steel structures due to the Hyogoken Nambu Earthquake which occurred in 1995, importance has been attached to seismic design for the construction of new bridges and to seismic retrofitting for existing steel bridges, aiming to utilize the ductility of steel bridge members and structures. Many repair and seismic retrofitting works of bridge structures damaged as a result of the earthquake have been carried out and these works are due to finish in the near future. Damaged parts in steel bridges were mainly classified into piers, bearings and restraining parts protecting bridges from falling down. Recently, the seismic retrofitting works of longspan steel bridges has started. For example, the seismic retrofitting work of the Minato Bridge in Osaka, a big cantilever truss bridge with a main span of 510 m is now under way, with an estimated budget of 6000 million Japanese Yen and a works duration of 5 years. The Maitani Bridge located in Nara Prefecture, a decktype steel girder bridge with the span length of 112 m is also undergoing seismic retrofitting. Nowadays, many existing steel bridges exhibit some form of deterioration, such as the corrosion of steel members, fatigue cracks in RC slabs, steel decks and steel members due to the passage of many overweight vehicles, much heavier than those specified in the Japanese Specifications for Highway Bridges (JSHB), and so on. As a result, many bridges require substantial strengthening and repair works. Instead of the construction of large and longspan bridges, the retrofitting, strengthening, repair and maintenance of existing steel bridges already constructed will take an increasingly important part of the future steel bridge market in Japan. In Japan, many bridges have been constructed to establish an efficient highway work since World War II. Attention has been, however, paid mainly to the construction of safe and standard bridges with, as far as possible, uniform quality with regard to design loads. Until recently, governments could not afford to consider the harmony between the bridges and their surrounding environment. For example, it is very difficult to have a clear and unobstructed view of the beautiful and historically important Osaka Castle due to the highrise buildings and elevated highway bridges. This is an example of the undesirable influence of elevated bridges on their surrounding environment. . Recent main works （ 1） Constr
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