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No.14 (1977/09) >

 
Title :沖縄県の老朽RC橋の曲げ破壊試験について
Title alternative :Bending Test of Deteriorated R.C. Bridge
Authors :大城, 武
浜田, 純夫
上間, 源蔵
上山, 秋雄
Authors alternative :Oshiro, Takeshi
Hamada, Sumio
Uema, Gengo
Ueyama, Akio
Issue Date :30-Sep-1977
Abstract :Deterioration of reinforced concrete bridges in use has become significant recently, and it is required to have full investigations on durability and serviceability of those bridges. Especially, these problems are urgent in Okinawa Prefecture, since most bridges are constructed along coastal area and reinforced bars are easily rusted under the influence of salt water. Therefore, the apparances show the worst condition, where cracks and spalls are observed due to expansion of reinforcing bars. Durability of those bridges has been estimated by external appearance only since there exist not enough materials. However, these estimations lack completely rational bases and it has been reguired to conduct some experimental analysis based on durability and material strength. New reserch program on durability of old reinforced concrete bridges is planned to investigate the problems mentioned above at Civil Engineering Reserch Center, Ministry of Construction, G.O.J. and this experimental reserch belongs to a part of the program. Yaka bridge was selected for this program, which was constructed on Rout 329 by U.S. Army in 1952. The apperance shows the typical mode of deterioration of R.C. bridges where rust on reinforcing bars results in cracks on covering concrete. Two main beams were cut out of the bridge during the reconstruction. Static bending test was performed on the test beams. The purpose of this test is to investigate general behavior during the bending test up to failure, and deflections and stresses are measured to compare with conventional reinforced concrete theory. It is concluded that the test beams behave elastically up to the design load and that the ultimate strength obtained from the test consist with the conventional theory, though one expected much reduction in capability from the appearance. There exist a few of this kind of tests and the results of this test will be useful for further investigation of deteriorated R.C. bridges.
Type Local :紀要論文
ISSN :0387-429X
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/26917
Citation :琉球大学理工学部紀要. 工学篇 = Bulletin of Science & Engineering Division, University of the Ryukyus. Engineering no.14 p.125 -137
Appears in Collections:No.14 (1977/09)

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