|主題||Strength and Structural Performance of Deteriorated Reinforced Concrete Bridges in Korea|
|筆頭著者||Keun-Joo BYUN （Yonsei University、Korea）|
|連名者1||Young-Jin KIM （Yonsei University、Korea）|
|連名者2||Kee-Sung LEE （Yonsei University、Korea）|
|連名者3||Sang-Min LEE （Yonsei University、Korea）|
A series of static and live load tests are performed on two deterio-rated RC bridges (slab and T-beam bridges :constructed in 1920 and 1949) in Korea to evaluate the degree of deterioration,the strengths of materials,the ultimate strength and load-carrying capacity of bridges,and structural performances such as the deformation and cracking behavior,the location of neutral axis and the transverse load distribution. And also,the evaluation technique which is capable of predicting the responses of existing RC bridges is proposed.
On the basis of the results obtained from the field testing of two deteriorated RC bridges,the conclusions are as follows:1)It is necessary to make an exact investigation on the presence of drawnings,the strength of materials,and the sectional area of reinforcing bars for the structural evaluation of existing RC bridges.2)According to field investigations the superstructures of these two bridges are highly deteriorated in appearance,but significant losses of strength and load-carrying capacities due to carbonations are not seen.3)The core strength of concrete is within the range of 58 % to 62 % of the nondestructive strength by the Schmidt hammer ,and the yield strength of reinforcing bars is within the range of 3200 to 3500 kg/cm2.4)The bridges are seen to behave like the uncracked section up to around the service load level,but its behavior is similar to the behavior of cracked section beyond the service load level.5)The load-carrying capacity of the existing RC bridges is shown to depend primarily on the amount of reinforcing bars.6)It is recommended that the load-carrying capacity of the RC bridges is derived from the ultimate strength theory.7)It is concluded that the slab and Tee-type bridges have enough load-carrying capacity. to carry the present Korean highway design load.