2024-03-29T09:28:59Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02005271
2022-10-31T02:36:05Z
1642837622505:1642837855274:1642837857300
1642838403551:1642838406845
老朽RC橋(炭焼橋)の桁疲労試験について
On the Beam Fatigue Test of a Deteriorated Reinforced Concrete Bridge
大城, 武
浜田, 純夫
成底, 弘敏
有住, 康則
Oshiro, Takeshi
Hamada, Sumio
Narisoko, Hirotoshi
Arizumi, Yasunori
Fatigue Strength
Deteriorated RC Bridge
Crack Width
Deflection
Strain
Most of RC bridges in Okinawa Prefecture have been constructed near the shore and deterioration of concrete due to rust of reinforcing bars becomes serious. Several investigations such as surface observations, truck loading tests and bending failure tests of main beams have been performed. These are mainly for static and fatigue behavior of a beam becomes important for the consideration of durability. Generally, fatigue strength of materials such as concrete and reinforcing bars is the major factor in determination of strength of a beam and fatigue behavior of the beam has not been seriously studied. However, it is considered as important since significant deterioration has been observed recently. Two beams tested here were cut of a deteriorated bridge and the appearance showed spalls of concrete on surface. Apparent losses in cross section of bars and bond stress were observed. This paper presents the results of fatigue test subjected to repeated loads where increasing rates of deflection, strain of bars and crack width and effectiveness of bond stress were carefully investigated. The immediate conclusions are as follows: (1) The significant reduction of bending rigidity and increase of crack width were not observed after repeated load, but residual deflection, strain and crack width were not negligible. (2) Sudden failure of test beams occured due to brittle failure of a reinforcing bar, which could be explained as the overstressing of a particular bar as result of loss in bond stress at neighboring bars.
紀要論文
http://purl.org/coar/resource_type/c_6501
琉球大学工学部
1981-09
VoR
http://hdl.handle.net/20.500.12000/14688
0389-102X
AN0025048X
琉球大学工学部紀要
22
74
57
jpn
open access