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Dr. Myungjae Lee
Korea Railroad Research Institute

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Research Keywords & Expertise

0 Centrifuge
0 Civil Engineering
0 monopile
0 pile foundation
0 pile behavior

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Journal article
Published: 26 September 2020 in Applied Sciences
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In this study, for the establishment of a safety evaluation method, non-destructive tests were performed by developing a full-scale model pier and simulating scour on the ground adjacent to a field pier. The surcharge load (0–250 kN) was applied to the full-scale model pier to analyze the load’s effect on the stability. For analyzing the pier’s behavior according to the impact direction, an impact was applied in the bridge axis direction, pier length direction, and pier’s outside direction. The impact height corresponded to the top of the pier. A 1-m deep scour was simulated along one side of the ground, which was adjacent to the pier foundation. The acceleration was measured using accelerometers when an impact was applied. The natural frequency, according to the impact direction and surcharge load, was calculated using a fast Fourier transform (FFT). In addition, the first mode (vibratory), second mode (vibratory), and third modes (torsion) were analyzed according to the pier behavior using the phase difference, and the effect of the scour occurrence on the natural frequency was analyzed. The first mode was most affected by the surcharge load and scour. The stability of the pier can be determined using the second mode, and the direction of the scour can be determined using the third mode.

ACS Style

Myungjae Lee; Mintaek Yoo; Hyun-Seok Jung; Ki Hyun Kim; Il-Wha Lee. Study on Dynamic Behavior of Bridge Pier by Impact Load Test Considering Scour. Applied Sciences 2020, 10, 6741 .

AMA Style

Myungjae Lee, Mintaek Yoo, Hyun-Seok Jung, Ki Hyun Kim, Il-Wha Lee. Study on Dynamic Behavior of Bridge Pier by Impact Load Test Considering Scour. Applied Sciences. 2020; 10 (19):6741.

Chicago/Turabian Style

Myungjae Lee; Mintaek Yoo; Hyun-Seok Jung; Ki Hyun Kim; Il-Wha Lee. 2020. "Study on Dynamic Behavior of Bridge Pier by Impact Load Test Considering Scour." Applied Sciences 10, no. 19: 6741.

Journal article
Published: 19 April 2019 in Applied Sciences
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In this study, centrifuge model tests were used to examine the lateral behavior of amonopile embedded in dry sand through cyclic lateral loading tests. The soil specimens used in thetests were dry Jumunjin sand with a relative density of 80% and a friction angle of 38°. A staticloading test was performed once, and cyclic loading tests were performed four times using fourmagnitudes of cyclic load (30%, 50%, 80%, and 120% of static lateral capacity). The experimentalcyclic p‐y curve was obtained through the tests, and the maximum soil resistance points that werefound for each load were used to find the cyclic p‐y backbone curve for each depth. The twovariables which are needed to define the cyclic p‐y backbone curve, i.e., the initial modulus ofsubgrade reaction (kini) and ultimate soil resistance (pu), were suggested as functions of the soil’sphysical properties and the pile. The cyclic p‐y curve of the first cycle and the 100th cycle wereformulated to present the upper limit and lower limit. The suggested cyclic p‐y curve had anoverestimated soil resistance compared with the existing API (1987) method, but the initial modulusof subgrade reaction was underestimated.

ACS Style

Lee; Kyung-Tae Bae; Mintaek Yoo; Bae; Yoo; Myungjae Lee; Il-Wha Lee. Cyclic p-y Curves of Monopiles in Dense Dry Sand Using Centrifuge Model Tests. Applied Sciences 2019, 9, 1641 .

AMA Style

Lee, Kyung-Tae Bae, Mintaek Yoo, Bae, Yoo, Myungjae Lee, Il-Wha Lee. Cyclic p-y Curves of Monopiles in Dense Dry Sand Using Centrifuge Model Tests. Applied Sciences. 2019; 9 (8):1641.

Chicago/Turabian Style

Lee; Kyung-Tae Bae; Mintaek Yoo; Bae; Yoo; Myungjae Lee; Il-Wha Lee. 2019. "Cyclic p-y Curves of Monopiles in Dense Dry Sand Using Centrifuge Model Tests." Applied Sciences 9, no. 8: 1641.