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Seismic Analysis of Safety-Related Nuclear Structures (ASCE 4-16) offers a two-step nonlinear soil-structure interaction analysis procedure for seismically base-isolated structures based on the seismic isolation design response spectrum. The two steps are (I) development of seismic isolation design response spectrum at the foundation level of an isolated structure using frequency domain soil–structure interaction (SSI) analysis for an equivalent linear SSI system and (II) nonlinear time domain analysis of the isolated structure using foundation input motions, which is consistent with the seismic isolation design response spectrum. In step II, the rocking component of the structure shall be considered when its effects are significant. However, the ASCE 4-16 does not present how to consider the rocking input. In this study, we propose a method of taking account the rocking component of a base-isolated structure with rigid basemat. Specifically, this paper presents a method of developing rocking input motion that is fully coupled with horizontal input motion at the base of the isolated structure. The method was verified by comparing numerical results using the rocking input for a base-isolated nuclear power plant with rigid basemat on a compliant soil medium with those of a refined nonlinear response history analysis.
Eun-Haeng Lee; Du-Ri Jung; Inkyu Rhee; Jae-Min Kim. A nonlinear soil-structure interaction analysis technique based on seismic isolation design response spectrum for seismically isolated nuclear structures with rigid basemat. Nuclear Engineering and Design 2021, 381, 111334 .
AMA StyleEun-Haeng Lee, Du-Ri Jung, Inkyu Rhee, Jae-Min Kim. A nonlinear soil-structure interaction analysis technique based on seismic isolation design response spectrum for seismically isolated nuclear structures with rigid basemat. Nuclear Engineering and Design. 2021; 381 ():111334.
Chicago/Turabian StyleEun-Haeng Lee; Du-Ri Jung; Inkyu Rhee; Jae-Min Kim. 2021. "A nonlinear soil-structure interaction analysis technique based on seismic isolation design response spectrum for seismically isolated nuclear structures with rigid basemat." Nuclear Engineering and Design 381, no. : 111334.
It is essential to reduce structural damages caused by earthquakes in severe conditions, such as layered ground, especially when a soft soil layer is close to the surface. In this study, the kinematic and inertial interactions, two mechanisms of soil–foundation–structure interaction (SFSI), of different soil–foundation–structure systems (SFS) were investigated on uniform and layered grounds. Two layered soil profiles composed of a low stiffness layer laid over another were prepared in an equivalent shear beam container. Nine centrifuge experiments were carried out for three structures located on the surface of each ground and exposed to the Hachinohe earthquake while increasing the peak acceleration of the input motion. Numerical simulations were performed to simulate the centrifuge tests. It was found that roof motion (RM) of the tall structure increased in layered profile even though the free-field motion (FFM) decreased compared to homogeneous ground. The appearance of a soft layer beneath structures modifies the SFS system’s stiffness that causes kinematic and inertial interactions to alter to those on uniform soil profile.
Van-Linh Ngo; Changho Lee; Jae-Min Kim. Effects of Stratification on Soil–Foundation–Structure Interaction: Centrifugal Observation and Numerical Simulation. Applied Sciences 2021, 11, 623 .
AMA StyleVan-Linh Ngo, Changho Lee, Jae-Min Kim. Effects of Stratification on Soil–Foundation–Structure Interaction: Centrifugal Observation and Numerical Simulation. Applied Sciences. 2021; 11 (2):623.
Chicago/Turabian StyleVan-Linh Ngo; Changho Lee; Jae-Min Kim. 2021. "Effects of Stratification on Soil–Foundation–Structure Interaction: Centrifugal Observation and Numerical Simulation." Applied Sciences 11, no. 2: 623.
Inkyu Rhee; Jae-Min Kim. Ultrasonic Wave Propagation Analysis for Damage Detection in Heterogeneous Concrete Materials. Journal of the Computational Structural Engineering Institute of Korea 2020, 33, 225 -235.
AMA StyleInkyu Rhee, Jae-Min Kim. Ultrasonic Wave Propagation Analysis for Damage Detection in Heterogeneous Concrete Materials. Journal of the Computational Structural Engineering Institute of Korea. 2020; 33 (4):225-235.
Chicago/Turabian StyleInkyu Rhee; Jae-Min Kim. 2020. "Ultrasonic Wave Propagation Analysis for Damage Detection in Heterogeneous Concrete Materials." Journal of the Computational Structural Engineering Institute of Korea 33, no. 4: 225-235.
: In a megacity, structure response during an earthquake could be increased or decreased due to effects from neighboring structures, through structure-soil-structure interaction (SSSI). In the present study, a series of dynamic geotechnical centrifuge tests are carried out to investigate SSSI effects on responses of structure with various characteristics of mass, height, and natural frequency. Experimental observations are focused on the effects of the distance between two structures, type, and peak acceleration of input excitation. A period lengthening is observed in the soil-foundation-structure interaction (SFSI) effects of all structures. It is monitored that an increment in response of smaller structure and a decrement in response of larger structure, compared to isolated structure, due to SSSI effects. Unfavorable distance reveals that the most significant increment in response of S2 structure occurred at approximately one-fourth of wavelength transmitted from the vibrating adjacent structure. More severe SSSI effects are found under a lower input earthquake acceleration. It is found that both height and mass ratios, between two adjacent structures, are particular parameters on SSSI, resulting in increment or reduction of structure response.
Van-Linh Ngo; Jae-Min Kim; Soo-Hyuk Chang; Changho Lee. Effect of Height Ratio and Mass Ratio on Structure—Soil—Structure Interaction of Two Structures Using Centrifugal Experiment. Applied Sciences 2019, 9, 526 .
AMA StyleVan-Linh Ngo, Jae-Min Kim, Soo-Hyuk Chang, Changho Lee. Effect of Height Ratio and Mass Ratio on Structure—Soil—Structure Interaction of Two Structures Using Centrifugal Experiment. Applied Sciences. 2019; 9 (3):526.
Chicago/Turabian StyleVan-Linh Ngo; Jae-Min Kim; Soo-Hyuk Chang; Changho Lee. 2019. "Effect of Height Ratio and Mass Ratio on Structure—Soil—Structure Interaction of Two Structures Using Centrifugal Experiment." Applied Sciences 9, no. 3: 526.
The potential for monitoring the construction of post-tensioned concrete beams and detecting damage to the beams under loading conditions was investigated through an experimental program. First, embedded sensors were investigated that could measure pre-stress from the fabrication process to a failure condition. Four types of sensors were installed on a steel frame, and the applicability and the accuracy of these sensors were tested while pre-stress was applied to a tendon in the steel frame. As a result, a tri-sensor loading plate and a Fiber Bragg Grating (FBG) sensor were selected as possible candidates. With those sensors, two pre-stressed concrete flexural beams were fabricated and tested. The pre-stress of the tendons was monitored during the construction and loading processes. Through the test, it was proven that the variation in thepre-stress had been successfully monitored throughout the construction process. The losses of pre-stress that occurred during a jacking and storage process, even those which occurred inside the concrete, were measured successfully. The results of the loading test showed that tendon stress and strain within the pure span significantly increased, while the stress in areas near the anchors was almost constant. These results prove that FBG sensors installed in a middle section can be used to monitor the strain within, and the damage to pre-stressed concrete beams.
Kyung-Joon Shin; Seong-Cheol Lee; Yun Yong Kim; Jae-Min Kim; Seunghee Park; Hwanwoo Lee. Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors. Sensors 2017, 17, 1843 .
AMA StyleKyung-Joon Shin, Seong-Cheol Lee, Yun Yong Kim, Jae-Min Kim, Seunghee Park, Hwanwoo Lee. Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors. Sensors. 2017; 17 (8):1843.
Chicago/Turabian StyleKyung-Joon Shin; Seong-Cheol Lee; Yun Yong Kim; Jae-Min Kim; Seunghee Park; Hwanwoo Lee. 2017. "Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors." Sensors 17, no. 8: 1843.
FBG sensors offer many advantages, such as a lack of sensitivity to electromagnetic waves, small size, high durability, and high sensitivity. However, their maximum strain measurement range is lower than the yield strain range (about 1.0%) of steel strands when embedded in steel strands. This study proposes a new FBG sensing technique in which an FBG sensor is recoated with polyimide and protected by a polyimide tube in an effort to enhance the maximum strain measurement range of FBG sensors embedded in strands. The validation test results showed that the proposed FBG sensing technique has a maximum strain measurement range of 1.73% on average, which is 1.73 times higher than the yield strain of the strands. It was confirmed that recoating the FBG sensor with polyimide and protecting the FBG sensor using a polyimide tube could effectively enhance the maximum strain measurement range of FBG sensors embedded in strands.
Jae-Min Kim; Chul-Min Kim; Song-Yi Choi; Bang Yeon Lee. Enhanced Strain Measurement Range of an FBG Sensor Embedded in Seven-Wire Steel Strands. Sensors 2017, 17, 1654 .
AMA StyleJae-Min Kim, Chul-Min Kim, Song-Yi Choi, Bang Yeon Lee. Enhanced Strain Measurement Range of an FBG Sensor Embedded in Seven-Wire Steel Strands. Sensors. 2017; 17 (7):1654.
Chicago/Turabian StyleJae-Min Kim; Chul-Min Kim; Song-Yi Choi; Bang Yeon Lee. 2017. "Enhanced Strain Measurement Range of an FBG Sensor Embedded in Seven-Wire Steel Strands." Sensors 17, no. 7: 1654.