This page has only limited features, please log in for full access.

Unclaimed
Heon-Joon Park
Department of Civil Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 28 June 2021 in Applied Sciences
Reads 0
Downloads 0

For tunneling in urban areas, understanding the interaction and behavior of tunnels and the foundation of adjacent structures is very important, and various studies have been conducted. Superstructures in urban areas are designed and constructed with piled rafts, which are more effective than the conventional piled foundation. However, the settlement of a piled raft induced by tunneling mostly focuses on raft settlement. In this study, therefore, raft and pile settlements were obtained through 3D numerical analysis, and the change rate of settlement along the pile length was calculated by linear assumption. Machine learning was utilized to develop prediction models for raft and pile settlement and change rate of settlement along the pile length due to tunneling. In addition, raft settlement in the laboratory model test was used for the verification of the prediction model of raft settlement, derived through machine learning. As a result, the change rate of settlement along the pile length was between 0.64 and −0.71. In addition, among features, horizontal offset pile tunnel had the greatest influence, and pile diameter and number had relatively little influence.

ACS Style

Dong-Wook Oh; Suk-Min Kong; Yong-Joo Lee; Heon-Joon Park. Prediction of Change Rate of Settlement for Piled Raft Due to Adjacent Tunneling Using Machine Learning. Applied Sciences 2021, 11, 6009 .

AMA Style

Dong-Wook Oh, Suk-Min Kong, Yong-Joo Lee, Heon-Joon Park. Prediction of Change Rate of Settlement for Piled Raft Due to Adjacent Tunneling Using Machine Learning. Applied Sciences. 2021; 11 (13):6009.

Chicago/Turabian Style

Dong-Wook Oh; Suk-Min Kong; Yong-Joo Lee; Heon-Joon Park. 2021. "Prediction of Change Rate of Settlement for Piled Raft Due to Adjacent Tunneling Using Machine Learning." Applied Sciences 11, no. 13: 6009.

Journal article
Published: 22 May 2021 in Applied Ocean Research
Reads 0
Downloads 0

As the importance of safe and economical foundation design of offshore wind turbines has increased, suction bucket foundations have become increasingly common. A tripod suction bucket foundation consists of three individual buckets arranged in a triangular shape. The cyclic behaviour and soil-foundation-structure interaction of single suction bucket foundations has been a subject of active research. However, it is difficult to predict the behaviour of tripod bucket foundation because it is structurally complex and requires consideration of cyclic load effects. This study focuses on the behaviour of tripod suction foundations under cyclic loading. The rotational stiffness of the tripod foundation is estimated by combining equations depending on compression, pullout, and rotational stiffness of the single suction bucket with a series of centrifuge model test results. By presenting the theoretical stiffness values, it is verified that the rotational stiffness can be estimated only based on the cross-section of the foundation and the shear modulus of the soil. In addition, it is possible to predict the long-term rotational stiffness of the tripod by applying the vertical stiffness obtained from the cyclic loading test of the single bucket to the simplified method.

ACS Style

Yeong-Hoon Jeong; Jae-Hyun Kim; Kil-Wan Ko; Heon-Joon Park. Simplified estimation of rotational stiffness of tripod foundation for offshore wind turbine under cyclic loadings. Applied Ocean Research 2021, 112, 102697 .

AMA Style

Yeong-Hoon Jeong, Jae-Hyun Kim, Kil-Wan Ko, Heon-Joon Park. Simplified estimation of rotational stiffness of tripod foundation for offshore wind turbine under cyclic loadings. Applied Ocean Research. 2021; 112 ():102697.

Chicago/Turabian Style

Yeong-Hoon Jeong; Jae-Hyun Kim; Kil-Wan Ko; Heon-Joon Park. 2021. "Simplified estimation of rotational stiffness of tripod foundation for offshore wind turbine under cyclic loadings." Applied Ocean Research 112, no. : 102697.

Research paper
Published: 20 February 2020 in Acta Geotechnica
Reads 0
Downloads 0

A disconnected piled raft (DPR) foundation has been introduced as an effective pile design to reduce the vertical loading experienced by the pile. The characterization of DPRs has focused on the load transfer mechanism, foundation and soil settlement, bearing capacity, load distribution, and bending moment of the piles. DPR piles can act to increase the bearing capacity of the ground, and DPRs can reduce settlement while securing the bearing capacity. In this study, centrifuge model tests are performed to simulate the static behavior of DPRs under actual stress conditions. The behaviors of the DPR foundation for axial load, axial load distribution among the piles, and bending moment are compared to those of the connected piled raft foundation to understand the complex behaviors of DPRs. The centrifuge test results show that DPRs help reduce the pile axial load and bending moment during vertical loading. In addition, DPRs show smaller vertical settlement than shallow foundations. Therefore, we confirm that DPRs can be applied in foundation design as settlement reducers.

ACS Style

Heon-Joon Park; Kil-Wan Ko; Young-Hun Song; Myung-Jun Song; Seokwoo Jin; Jeong-Gon Ha; Dong-Soo Kim. Centrifuge modeling of disconnected piled raft using vertical pushover tests. Acta Geotechnica 2020, 15, 2637 -2648.

AMA Style

Heon-Joon Park, Kil-Wan Ko, Young-Hun Song, Myung-Jun Song, Seokwoo Jin, Jeong-Gon Ha, Dong-Soo Kim. Centrifuge modeling of disconnected piled raft using vertical pushover tests. Acta Geotechnica. 2020; 15 (9):2637-2648.

Chicago/Turabian Style

Heon-Joon Park; Kil-Wan Ko; Young-Hun Song; Myung-Jun Song; Seokwoo Jin; Jeong-Gon Ha; Dong-Soo Kim. 2020. "Centrifuge modeling of disconnected piled raft using vertical pushover tests." Acta Geotechnica 15, no. 9: 2637-2648.

Journal article
Published: 01 December 2019 in Canadian Geotechnical Journal
Reads 0
Downloads 0

When connected piles are used as settlement reducers, the proportion of vertical load carried by the pile may come close to the allowable load of the pile. To reduce not only the vertical load, but also the lateral load and bending moment to which the pile is subjected, the disconnected piled raft (DPR) has been introduced as an effective design for the role of the settlement reducers. Although several DPRs have been constructed, most of the research efforts on DPRs are limited to the structural behavior such as the evaluation of the seismic acceleration of the structure on the DPR; thus, there is a need to evaluate the dynamic performance of DPRs focusing on geotechnical problems. In this study, the seismic behavior of DPRs is investigated using dynamic centrifuge tests and compared with the results obtained from connected piled rafts (CPRs). The bending moment of piles of different materials, namely aluminum and steel, is evaluated. Results show that there is a reduction in the amplitude of acceleration of the foundation horizontal motion for the DPR compared to the CPR. The edge pile of a DPR attracts the smaller dynamic bending moment of the pile compared to that of a CPR. The dynamic bending moment of piles is predominantly governed by the soil behavior rather than the pile material. Finally, the seismic behavior of DPR was evaluated comprehensively through centrifuge tests.

ACS Style

Kil-Wan Ko; Heon-Joon Park; Jeong-Gon Ha; Seokwoo Jin; Young-Hun Song; Myung-Jun Song; Dong-Soo Kim. Evaluation of dynamic bending moment of disconnected piled raft via centrifuge tests. Canadian Geotechnical Journal 2019, 56, 1917 -1928.

AMA Style

Kil-Wan Ko, Heon-Joon Park, Jeong-Gon Ha, Seokwoo Jin, Young-Hun Song, Myung-Jun Song, Dong-Soo Kim. Evaluation of dynamic bending moment of disconnected piled raft via centrifuge tests. Canadian Geotechnical Journal. 2019; 56 (12):1917-1928.

Chicago/Turabian Style

Kil-Wan Ko; Heon-Joon Park; Jeong-Gon Ha; Seokwoo Jin; Young-Hun Song; Myung-Jun Song; Dong-Soo Kim. 2019. "Evaluation of dynamic bending moment of disconnected piled raft via centrifuge tests." Canadian Geotechnical Journal 56, no. 12: 1917-1928.

Journal article
Published: 06 November 2019 in Engineering Geology
Reads 0
Downloads 0

We develop an automated procedure to estimate time-averaged shear wave velocities in the upper 30 m of soil deposits (VS30) rapidly and objectively based on initial P-wave seismogram amplitudes in the radial and vertical directions. We apply this procedure to 630 Kiban-Kyoshin network stations in Japan utilizing 9207 records. It is clear that the estimates are in good agreement with real-world measurements. Filtering records based on signal-to-noise ratio (SNR) thresholds slightly improves VS30 estimation, but a decrease in the number of records results in an inability to estimate VS30 at certain sites. We propose bias correction models based on SNRs and take-off angles to facilitate VS30 estimation at numerous sites while maintaining suitable prediction performance. We observe that the performance of the proposed method is similar to that of methods utilizing different types of proxies for various regions. We successfully apply the proposed method to 989 Kyoshin network stations utilizing 18,454 records and create a VS30 map for the entire area of Japan.

ACS Style

Sinhang Kang; Byungmin Kim; Heon-Joon Park; Junyoung Lee. Automated procedure for estimating VS30 utilizing P-wave seismograms and its application to Japan. Engineering Geology 2019, 264, 105388 .

AMA Style

Sinhang Kang, Byungmin Kim, Heon-Joon Park, Junyoung Lee. Automated procedure for estimating VS30 utilizing P-wave seismograms and its application to Japan. Engineering Geology. 2019; 264 ():105388.

Chicago/Turabian Style

Sinhang Kang; Byungmin Kim; Heon-Joon Park; Junyoung Lee. 2019. "Automated procedure for estimating VS30 utilizing P-wave seismograms and its application to Japan." Engineering Geology 264, no. : 105388.

Articles
Published: 18 September 2019 in International Journal of Architectural Heritage
Reads 0
Downloads 0

In this study, the seismic performance of a three-story masonry stone pagoda is examined using the three-dimensional finite element modeling of ANSYS simulation software and dynamic centrifuge test. Seokgatap pagoda is chosen as a representative Korean stone pagoda in Silla dynasty for the study. The numerical modeling of it is constructed with the same specification and conditions of the real structure and dynamic centrifuge test. In the analysis, the ground motion record from the Ofunato earthquake is input to the modeling, with various peak acceleration levels from 0.06 g to 0.45 g, and results are obtained at different heights of the pagoda structure from 0.2 m to 5.44 m. The analytical results of mode shapes, time domain signal, frequency response, peak ground acceleration, as well as amplification ratio, are estimated to assess seismic behavior, and these are verified with the results of the dynamic centrifuge test.

ACS Style

Khoa V. A. Pham; Sung-Gul Hong; Sung-Min Lee; Heon-Joon Park; Kihak Lee. Assessment of Seismic Performance of Three-Story Masonry Stone Pagoda by Dynamic Centrifuge Test and Simulation Analysis. International Journal of Architectural Heritage 2019, 1 -14.

AMA Style

Khoa V. A. Pham, Sung-Gul Hong, Sung-Min Lee, Heon-Joon Park, Kihak Lee. Assessment of Seismic Performance of Three-Story Masonry Stone Pagoda by Dynamic Centrifuge Test and Simulation Analysis. International Journal of Architectural Heritage. 2019; ():1-14.

Chicago/Turabian Style

Khoa V. A. Pham; Sung-Gul Hong; Sung-Min Lee; Heon-Joon Park; Kihak Lee. 2019. "Assessment of Seismic Performance of Three-Story Masonry Stone Pagoda by Dynamic Centrifuge Test and Simulation Analysis." International Journal of Architectural Heritage , no. : 1-14.

Geotechnical engineering
Published: 03 September 2019 in KSCE Journal of Civil Engineering
Reads 0
Downloads 0

Permanent displacement of slopes is key data for designing the slope in performance-based seismic design. To estimate the permanent displacement of a slope, empirical as well as numerical methods should be adopted. However, the results of these methods are highly dependent on both stationary and nonstationary ground-motion characteristics. This paper aims to find the most influential nonstationary characteristics of earthquakes on the permanent displacement of slopes. Two different numerical methods, Newmark’s sliding-block and response-history analysis, are used for a total of 47 real earthquake records. The records are classified into three groups based on their event characteristics. They are spectrally matched before analysis to the target spectrum to eliminate the effect of stationary characteristics. The amount of permanent displacement obtained from the analyses is different for varying input motions. The intensity-based parameters, destructiveness potential factor, Arias intensity, and characteristic intensity play an important role on the permanent displacement of the slope. The results of this study are expected to yield judgment criteria for designers to select appropriate ground motion to evaluate the permanent displacement of slopes under seismic loading.

ACS Style

Jinsun Lee; Qihang Liu; Heon-Joon Park. Effect of Earthquake Motion on The Permanent Displacement of Embankment Slopes. KSCE Journal of Civil Engineering 2019, 23, 4174 -4189.

AMA Style

Jinsun Lee, Qihang Liu, Heon-Joon Park. Effect of Earthquake Motion on The Permanent Displacement of Embankment Slopes. KSCE Journal of Civil Engineering. 2019; 23 (10):4174-4189.

Chicago/Turabian Style

Jinsun Lee; Qihang Liu; Heon-Joon Park. 2019. "Effect of Earthquake Motion on The Permanent Displacement of Embankment Slopes." KSCE Journal of Civil Engineering 23, no. 10: 4174-4189.

Journal article
Published: 01 August 2019 in Journal of Geotechnical and Geoenvironmental Engineering
Reads 0
Downloads 0

Rocking foundations have emerged as an attractive design to reduce the seismic loads of structures during strong earthquakes. However, they cannot be applied in the field directly because of the permanent deformation caused by their rocking behavior. To reduce the permanent deformation induced by a rocking foundation, installation of an unconnected pile below the foundation has been suggested as an improved design. The region of significant plastic strains beneath the foundation caused by the rocking behavior is located at a shallow depth; thus, the length of the unconnected pile is reduced relative to the case of connected piles. In this study, to determine the optimized design for a rocking foundation, horizontal slow cyclic tests and dynamic centrifuge shake-table tests were performed for various types of foundation models incorporating short piles. The foundation–structure system was designed to exhibit rocking-dominant behavior. Based on the results of the horizontal slow cyclic tests and dynamic centrifuge tests, the rocking behaviors of the tested models were compared. A setup featuring unconnected short piles with a soil layer is proposed as an optimized rocking foundation design, focusing on the reduction of the permanent deformation of soil.

ACS Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. Centrifuge Modeling of Improved Design for Rocking Foundation Using Short Piles. Journal of Geotechnical and Geoenvironmental Engineering 2019, 145, 04019031 .

AMA Style

Kil-Wan Ko, Jeong-Gon Ha, Heon-Joon Park, Dong-Soo Kim. Centrifuge Modeling of Improved Design for Rocking Foundation Using Short Piles. Journal of Geotechnical and Geoenvironmental Engineering. 2019; 145 (8):04019031.

Chicago/Turabian Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. 2019. "Centrifuge Modeling of Improved Design for Rocking Foundation Using Short Piles." Journal of Geotechnical and Geoenvironmental Engineering 145, no. 8: 04019031.

Journal article
Published: 15 May 2019 in Soil Dynamics and Earthquake Engineering
Reads 0
Downloads 0

Conventional simplified analysis methods for seismic design of gravity-type quay wall are based on providing capacity to resist a design seismic force, but they do not provide information on the performance of a structure when the limit of the force-balance is exceeded. In order to overcome the limitation of conventional seismic design methods, a performance-based seismic coefficient (khk) concept which can verify the performance of port structures exceeding the limit of force-balance was proposed in the technical standards and commentaries for port and harbour facilities in Japan, published in 2007. The khk concept considers the deformation of the quay wall, the wall height, the effect of frequency characteristics and duration of the ground motions, and the natural period of the ground. This paper proposes a performance verification method for the gravity-type quay wall during earthquakes through dynamic centrifuge model tests. The centrifuge tests were used in the present study to validate the proposed khk concept for evaluating the seismic performance of the quay wall under various conditions. The reliability of the khk concept was evaluated for different wall heights, earthquake motions and the thickness of subsoil, which are the primary variables in the khk equation. In addition, some improvements that should be considered in the future revision of the khk equation are discussed in this research.

ACS Style

Moon Gyo Lee; Jeong-Gon Ha; Satish Manandhar; Heon-Joon Park; Dong-Soo Kim. Evaluation of performance-based seismic coefficient for gravity-type quay wall via centrifuge tests. Soil Dynamics and Earthquake Engineering 2019, 123, 292 -303.

AMA Style

Moon Gyo Lee, Jeong-Gon Ha, Satish Manandhar, Heon-Joon Park, Dong-Soo Kim. Evaluation of performance-based seismic coefficient for gravity-type quay wall via centrifuge tests. Soil Dynamics and Earthquake Engineering. 2019; 123 ():292-303.

Chicago/Turabian Style

Moon Gyo Lee; Jeong-Gon Ha; Satish Manandhar; Heon-Joon Park; Dong-Soo Kim. 2019. "Evaluation of performance-based seismic coefficient for gravity-type quay wall via centrifuge tests." Soil Dynamics and Earthquake Engineering 123, no. : 292-303.

Journal article
Published: 14 March 2019 in Sustainability
Reads 0
Downloads 0

The Gyeongju Historic Areas, which include the millennium-old capital of the Silla Kingdom, are located in the region most frequently affected by seismic events in the Korean peninsula. Despite the numerous earthquakes documented, most of the stone architectural heritage has retained their original forms. This study systematically reviews and categorises studies dealing with the seismic risk assessment of the architectural heritage of the historic areas. It applies research methodologies, such as the evaluation of the engineering characteristics of subsoil in architectural heritage sites, site-specific analysis of the ground motions in response to earthquake scenarios, geographic information system (GIS)-based seismic microzonation according to the geotechnical engineering parameters, reliability assessment of dynamic centrifuge model testing for stone masonry structures and evaluation of seismic behaviour of architectural heritage. The M 5.8 earthquake that hit Gyeongju on September 12, 2016 is analysed from an engineering point of view and the resulting damage to the stone architectural heritage is reported. The study focuses on Cheomseongdae, an astronomical observatory in Gyeongju, whose structural engineering received considerable attention since its seismic resistance was reported after the last earthquake. Dynamic centrifuge model tests applying the Gyeongju Earthquake motions are performed to prove that it is not a coincidence that Cheomseongdae, a masonry structure composed of nearly 400 stone members, survived numerous seismic events for over 1300 years. The structural characteristics of Cheomseongdae, such as the well-compacted filler materials in its lower part, rough inside wall in contrast to the smooth exterior, intersecting stone beams and interlocking headstones are proven to contribute to its overall seismic performance, demonstrating outstanding seismic design technology.

ACS Style

Heon-Joon Park; Jeong-Gon Ha; Se-Hyun Kim; Sang-Sun Jo. Seismic Performance of Ancient Masonry Structures in Korea Rediscovered in 2016 M 5.8 Gyeongju Earthquake. Sustainability 2019, 11, 1565 .

AMA Style

Heon-Joon Park, Jeong-Gon Ha, Se-Hyun Kim, Sang-Sun Jo. Seismic Performance of Ancient Masonry Structures in Korea Rediscovered in 2016 M 5.8 Gyeongju Earthquake. Sustainability. 2019; 11 (6):1565.

Chicago/Turabian Style

Heon-Joon Park; Jeong-Gon Ha; Se-Hyun Kim; Sang-Sun Jo. 2019. "Seismic Performance of Ancient Masonry Structures in Korea Rediscovered in 2016 M 5.8 Gyeongju Earthquake." Sustainability 11, no. 6: 1565.

Journal article
Published: 31 December 2018 in Journal of the Geological Society of Korea
Reads 0
Downloads 0
ACS Style

Sung-Bok Lee; Heon-Joon Park. A benchmark experiment for analogue modeling of extensional basin formation and evaluation of applicability of centrifuge test. Journal of the Geological Society of Korea 2018, 54, 605 -614.

AMA Style

Sung-Bok Lee, Heon-Joon Park. A benchmark experiment for analogue modeling of extensional basin formation and evaluation of applicability of centrifuge test. Journal of the Geological Society of Korea. 2018; 54 (6):605-614.

Chicago/Turabian Style

Sung-Bok Lee; Heon-Joon Park. 2018. "A benchmark experiment for analogue modeling of extensional basin formation and evaluation of applicability of centrifuge test." Journal of the Geological Society of Korea 54, no. 6: 605-614.

Original research
Published: 18 December 2018 in Bulletin of Earthquake Engineering
Reads 0
Downloads 0

An unconnected pile foundation allows separation between the lower pile and the pile cap, and it has been proposed as an effective foundation type for reducing the seismic load during strong earthquakes. However, previous quantitative evaluations of unconnected piles with various foundation types and earthquake intensities are inadequate. In this study, the influence of base shaking level and the material of the interposed layer between pile and pile cap on the seismic behaviour of unconnected piles were evaluated using a centrifuge model test to reproduce the field stress conditions. A dynamic centrifuge model test was completed on an experimental model consisting of dry sandy soil, a foundation and a single degree-of-freedom structure. The acceleration of the structure and the settlement of the foundation system were measured during base shaking. For the unconnected pile system, the structural seismic load reduction effect due to rocking behaviour was confirmed, and the unconnected pile foundation with the interposed layer with large stiffness had less vertical settlement than the conventional shallow foundation. Finally, the rotational stiffness and damping ratio for the foundation system used in the centrifuge model tests were derived and discussed.

ACS Style

Jeong-Gon Ha; Kil-Wan Ko; Seong-Bae Jo; Heon-Joon Park; Dong-Soo Kim. Investigation of seismic performances of unconnected pile foundations using dynamic centrifuge tests. Bulletin of Earthquake Engineering 2018, 17, 2433 -2458.

AMA Style

Jeong-Gon Ha, Kil-Wan Ko, Seong-Bae Jo, Heon-Joon Park, Dong-Soo Kim. Investigation of seismic performances of unconnected pile foundations using dynamic centrifuge tests. Bulletin of Earthquake Engineering. 2018; 17 (5):2433-2458.

Chicago/Turabian Style

Jeong-Gon Ha; Kil-Wan Ko; Seong-Bae Jo; Heon-Joon Park; Dong-Soo Kim. 2018. "Investigation of seismic performances of unconnected pile foundations using dynamic centrifuge tests." Bulletin of Earthquake Engineering 17, no. 5: 2433-2458.

Research article
Published: 23 October 2018 in Wind Energy
Reads 0
Downloads 0

Offshore wind energy has been growing up as a promising renewable energy source. Recently, tripod suction bucket foundation is rapidly expanding as a foundation system supporting the offshore wind turbine. In offshore environment, wind turbine foundation structures should be designed considering cyclic loading which can lead to permanent deformation of structure, tilting problem, and overall degradation of soil stiffness. However, it is technically difficult to predict the cyclic behavior of the tripod accurately because the cyclic behaviors of the tripod bucket can be inferred from vertical pullout and compression behaviors of each single bucket elements. In this paper, a series of model tests was performed by applying cyclic vertical compression and extension loadings to a single bucket element that is one element of the tripod foundation. Loading directions, level, and rate were controlled for investigating of cyclic behavior of tripod foundation. On the basis of testing results, the permanent deformation and cyclic stiffness response of tripod suction caisson were discussed. Based on the test results, it was confirmed that the cyclic behavior of the single bucket is affected by the load level and rate. In addition, the behavior showed quite different trends with the loading directions: compression, pullout, and two‐way.

ACS Style

Yeong-Hoon Jeong; Jae-Hyun Kim; Heon-Joon Park; Dong-Soo Kim. Cyclic behavior of unit bucket for tripod foundation system supporting offshore wind turbine via model tests. Wind Energy 2018, 22, 257 -268.

AMA Style

Yeong-Hoon Jeong, Jae-Hyun Kim, Heon-Joon Park, Dong-Soo Kim. Cyclic behavior of unit bucket for tripod foundation system supporting offshore wind turbine via model tests. Wind Energy. 2018; 22 (2):257-268.

Chicago/Turabian Style

Yeong-Hoon Jeong; Jae-Hyun Kim; Heon-Joon Park; Dong-Soo Kim. 2018. "Cyclic behavior of unit bucket for tripod foundation system supporting offshore wind turbine via model tests." Wind Energy 22, no. 2: 257-268.

Journal article
Published: 01 September 2018 in Géotechnique Letters
Reads 0
Downloads 0

The installation of mobile jack-up platforms on a sloped seabed creates hazardous conditions on the spudcans and legs by inducing detrimental moment and horizontal loads that normally do not occur on a flat seabed. Despite these risks, only a limited number of studies on the effect of a sloped seabed have been reported. In this paper, a series of experiments were performed to investigate the effect of a sloped seabed on the spudcan behaviour on sand using a centrifuge. The scaled spudcan was installed on saturated silty sand at different slope angles (0, 5 and 10°) and the combined vertical, horizontal and moment loads were recorded during installation. The results clearly showed that the horizontal and moment loads increased with slope angles. In addition, the penetration behaviour of the spudcan installed on the sloped seabed was different from that on a flat seabed especially until the full width of the spudcan becomes embedded. However, horizontal and moment loads were attenuated once the full diameter was deeply embedded in the soil.

ACS Style

J.-H. Kim; Y.-H. Jeong; H.-J. Park; D.-S. Kim; S.-J. Kim; S. W. Lee; M. Chung; J. Choi; J.-T. Han. Investigation of spudcan–soil interaction in a sloped seabed using centrifuge model tests. Géotechnique Letters 2018, 8, 208 -213.

AMA Style

J.-H. Kim, Y.-H. Jeong, H.-J. Park, D.-S. Kim, S.-J. Kim, S. W. Lee, M. Chung, J. Choi, J.-T. Han. Investigation of spudcan–soil interaction in a sloped seabed using centrifuge model tests. Géotechnique Letters. 2018; 8 (3):208-213.

Chicago/Turabian Style

J.-H. Kim; Y.-H. Jeong; H.-J. Park; D.-S. Kim; S.-J. Kim; S. W. Lee; M. Chung; J. Choi; J.-T. Han. 2018. "Investigation of spudcan–soil interaction in a sloped seabed using centrifuge model tests." Géotechnique Letters 8, no. 3: 208-213.

Journal article
Published: 01 July 2018 in Journal of Geotechnical and Geoenvironmental Engineering
Reads 0
Downloads 0

Geotechnical engineering preparation is essential for successful lunar exploration due to the distinct differences in the environment between the Earth and the Moon. In particular, the bearing capacity of the lunar surface is an important index related to the landing of lunar probes. This study suggests two experimental methods using a centrifuge and lunar simulant for simulating the reduced-gravity environment of the Moon and investigates the influence of low gravity on the bearing capacity of shallow footings. First, the effects of footing size and gravity on the bearing capacity are investigated through a series of loading tests performed under various conditions of footing size and centrifugal acceleration. Then a predictive equation for the bearing capacity of shallow footings on the lunar surface is suggested. Finally, centrifuge model tests for directly simulating lunar prototype footings are performed for comparison with the suggested bearing capacity equations of shallow footings on the lunar surface, and the reliability of simulating the gravity of the Moon is verified.

ACS Style

Hey-Rim Lee; Heon-Joon Park; Dong-Soo Kim. Bearing Capacity of Shallow Footings in Simulated Lunar Environments Using Centrifuge Tests. Journal of Geotechnical and Geoenvironmental Engineering 2018, 144, 04018042 .

AMA Style

Hey-Rim Lee, Heon-Joon Park, Dong-Soo Kim. Bearing Capacity of Shallow Footings in Simulated Lunar Environments Using Centrifuge Tests. Journal of Geotechnical and Geoenvironmental Engineering. 2018; 144 (7):04018042.

Chicago/Turabian Style

Hey-Rim Lee; Heon-Joon Park; Dong-Soo Kim. 2018. "Bearing Capacity of Shallow Footings in Simulated Lunar Environments Using Centrifuge Tests." Journal of Geotechnical and Geoenvironmental Engineering 144, no. 7: 04018042.

Original research
Published: 21 June 2018 in Bulletin of Earthquake Engineering
Reads 0
Downloads 0

Designs allowing the rocking behavior of the foundation during earthquake have been introduced to reduce the seismic load on the superstructure and the ductility demand on the structural column. In addition, several studies have been conducted on rocking foundation based on the slow cyclic and dynamic tests by assuming the structure as a rigid oscillator. However, when structural bending is included, the rocking behaviors of the foundation for the slow cyclic and dynamic tests are different. Therefore, a clear description of each method and how each behavior is different should be investigated by considering structural bending motion. To fill the gap between cyclic and dynamic rocking behaviors, embedded foundation models with various slenderness ratios of the systems were investigated using horizontal slow cyclic tests and dynamic tests in a centrifuge. Test results show that the rocking foundation was affected by structural bending. The overturning moment in the dynamic test determined by the conventional method was different compared with results obtained from the slow cyclic test due to the structural bending motion. Finally, the overturning moment was re-evaluated by considering structural net displacement, and the re-evaluated dynamic overturning moment matched the results from the slow cyclic tests.

ACS Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. Comparison between cyclic and dynamic rocking behavior for embedded shallow foundation using centrifuge tests. Bulletin of Earthquake Engineering 2018, 16, 5171 -5193.

AMA Style

Kil-Wan Ko, Jeong-Gon Ha, Heon-Joon Park, Dong-Soo Kim. Comparison between cyclic and dynamic rocking behavior for embedded shallow foundation using centrifuge tests. Bulletin of Earthquake Engineering. 2018; 16 (11):5171-5193.

Chicago/Turabian Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. 2018. "Comparison between cyclic and dynamic rocking behavior for embedded shallow foundation using centrifuge tests." Bulletin of Earthquake Engineering 16, no. 11: 5171-5193.

Conference paper
Published: 07 June 2018 in Geotechnical Earthquake Engineering and Soil Dynamics V
Reads 0
Downloads 0

The pseudo-static approach has been conventionally applied for the design of gravity type quay walls. In this method, the seismic coefficient (kh), expressed in terms of acceleration due to gravity, is used to convert the real dynamic behavior to an equivalent pseudo-static inertial force for seismic analysis and design. Therefore, the calculation of an appropriate kh considering frequency characteristics of input earthquake is critical for representing the real dynamic behavior. However, the definitions of kh, which is used for simplified analysis in Korea, focus only on convenience, and the frequency characteristics of input earthquake are not reflected in the kh definitions. This paper evaluates the influences of the frequency characteristics of input earthquake on kh by initially reviewing the kh definitions in the existing codes of Japan for port structures and then by performing two dynamic centrifuge tests on caisson gravity quay walls of different earthquake input motions (Ofunato, Hachinohe). A review of the existing codes and guidelines has shown that the kh values are estimated differently according to the frequency characteristics of input earthquake. On the other hand, based on the centrifuge tests, it was found that the permanent displacements of wall are larger when long-period-dominant earthquake is applied.

ACS Style

Moon-Gyo Lee; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. Evaluation of the Influence of Frequency Characteristics of Input Earthquake on Seismic Coefficient for Gravity Quay Wall via Dynamic Centrifuge Tests. Geotechnical Earthquake Engineering and Soil Dynamics V 2018, 1 .

AMA Style

Moon-Gyo Lee, Jeong-Gon Ha, Heon-Joon Park, Dong-Soo Kim. Evaluation of the Influence of Frequency Characteristics of Input Earthquake on Seismic Coefficient for Gravity Quay Wall via Dynamic Centrifuge Tests. Geotechnical Earthquake Engineering and Soil Dynamics V. 2018; ():1.

Chicago/Turabian Style

Moon-Gyo Lee; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. 2018. "Evaluation of the Influence of Frequency Characteristics of Input Earthquake on Seismic Coefficient for Gravity Quay Wall via Dynamic Centrifuge Tests." Geotechnical Earthquake Engineering and Soil Dynamics V , no. : 1.

Conference paper
Published: 07 June 2018 in Geotechnical Earthquake Engineering and Soil Dynamics V
Reads 0
Downloads 0

Rocking behavior of shallow foundations for bridge piers has emerged as an effective method to reduce the seismic load on the superstructure. The design philosophy that uses the rocking behavior of shallow foundation during an earthquake is called “rocking foundation”. Previous studies on rocking foundation have focused on the verification of rocking effect to reduce the seismic load. Nevertheless, the rocking foundation is not used in practice due to the lack of understanding on the mechanism of rocking behavior. In this study, slow cyclic tests were performed using a geotechnical centrifuge with different slenderness ratios of structures to investigate the rocking mechanism of shallow foundation. From the variations of the pressure below the shallow foundation, “soil rounding” phenomenon was observed. In addition, the soil rounding effect, the key mechanism of rocking foundation, was described in two parts. Before yielding, a relation between overturning moment in the shallow foundation and the cyclic load direction was observed. The overturning moment converged to the ultimate moment capacity of shallow foundation after yielding. Therefore, the rocking mechanism of the shallow foundation was investigated using the soil rounding phenomena.

ACS Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. Investigation of Rocking Mechanism of Shallow Foundation via Centrifuge Tests. Geotechnical Earthquake Engineering and Soil Dynamics V 2018, 1 .

AMA Style

Kil-Wan Ko, Jeong-Gon Ha, Heon-Joon Park, Dong-Soo Kim. Investigation of Rocking Mechanism of Shallow Foundation via Centrifuge Tests. Geotechnical Earthquake Engineering and Soil Dynamics V. 2018; ():1.

Chicago/Turabian Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. 2018. "Investigation of Rocking Mechanism of Shallow Foundation via Centrifuge Tests." Geotechnical Earthquake Engineering and Soil Dynamics V , no. : 1.

Journal article
Published: 01 March 2018 in Journal of Geotechnical and Geoenvironmental Engineering
Reads 0
Downloads 0

The rocking behavior of a shallow foundation of a bridge pier has emerged as an effective mechanism for reducing the seismic load on the superstructure during a strong earthquake. However, a lack of understanding regarding the rocking behavior of shallow foundations has hindered the application of the rocking foundation design philosophy to construction. In this study, the soil-rounding effect on embedded foundations was evaluated to increase understanding of the rocking mechanism. A centrifuge apparatus was used to conduct horizontal slow cyclic tests on an embedded shallow foundation model for three different slenderness ratios (i.e., structure height divided by foundation length) at a centrifugal acceleration of 20 g. The soil-rounding phenomenon was examined according to variations in the soil pressure under the foundation during cyclic loading, and the shape of the rounded soil surface was evaluated as a function of the slenderness ratio. The ultimate moment capacity of the shallow foundation was observed to increase with the side soil pressure; this was verified by comparing the side soil earth pressure with the overturning moment. The rocking mechanism of the embedded shallow foundation was evaluated by focusing on soil rounding.

ACS Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. Soil-Rounding Effect on Embedded Rocking Foundation via Horizontal Slow Cyclic Tests. Journal of Geotechnical and Geoenvironmental Engineering 2018, 144, 04018004 .

AMA Style

Kil-Wan Ko, Jeong-Gon Ha, Heon-Joon Park, Dong-Soo Kim. Soil-Rounding Effect on Embedded Rocking Foundation via Horizontal Slow Cyclic Tests. Journal of Geotechnical and Geoenvironmental Engineering. 2018; 144 (3):04018004.

Chicago/Turabian Style

Kil-Wan Ko; Jeong-Gon Ha; Heon-Joon Park; Dong-Soo Kim. 2018. "Soil-Rounding Effect on Embedded Rocking Foundation via Horizontal Slow Cyclic Tests." Journal of Geotechnical and Geoenvironmental Engineering 144, no. 3: 04018004.

Journal article
Published: 02 January 2018 in Journal of the Earthquake Engineering Society of Korea
Reads 0
Downloads 0
ACS Style

Moon Gyo Lee; Jeong Gon Ha; Heon Joon Park; Dong Soo Kim. A Discussion on the Seismic Coefficient for Gravity Quay Wall Considering Frequency Characteristics of Input Earthquake. Journal of the Earthquake Engineering Society of Korea 2018, 22, 15 -22.

AMA Style

Moon Gyo Lee, Jeong Gon Ha, Heon Joon Park, Dong Soo Kim. A Discussion on the Seismic Coefficient for Gravity Quay Wall Considering Frequency Characteristics of Input Earthquake. Journal of the Earthquake Engineering Society of Korea. 2018; 22 (1):15-22.

Chicago/Turabian Style

Moon Gyo Lee; Jeong Gon Ha; Heon Joon Park; Dong Soo Kim. 2018. "A Discussion on the Seismic Coefficient for Gravity Quay Wall Considering Frequency Characteristics of Input Earthquake." Journal of the Earthquake Engineering Society of Korea 22, no. 1: 15-22.