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Goit Chandra Shekhar
| Environmental Science and Civil Engineering Division | Assistant Professor |
| Department of Civil and Environmental Engineering |
Researcher information
■ Field Of Study- Social infrastructure (civil Engineering, architecture, disaster prevention), Structural and seismic engineering
- Apr. 2016 - Present, Saitama University, Graduate School of Science and Engineering, Japan
- Feb. 2015 - Mar. 2016, Saitama University, Graduate School of Science and Engineering, Japan
Performance information
■ Paper- Seismic performance of pile foundations reinforced with micropiles
Rahman M.; Iwamura S.; Goit CS; Saitoh M.
18th East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-18), Nov. 2024, [Reviewed]
English, International conference proceedings - Effects of Soil Nonlinearity on the Seismic Behavior of Pile Foundations Reinforced with Micropiles
Chandra Shekhar Goit; Shogo Honma; Masato Saitoh; Pujan Giri
International Journal of Geomechanics, Volume：24, Number：10, Oct. 2024, [Reviewed]
American Society of Civil Engineers (ASCE), English, Scientific journal
DOI：https://doi.org/10.1061/ijgnai.gmeng-9600
DOI ID：10.1061/ijgnai.gmeng-9600, ISSN：1532-3641, eISSN：1943-5622 - Experimental studies on the kinematic response of micropiles-retrofitted bridge foundations
Goit CS; Maruyama Y.; Saitoh M.; Ekubo S.
18th World Conference on Earthquake Engineering, Jun, 2024, Jun. 2024, [Reviewed]
English, International conference proceedings - Frequency- and intensity-dependent impedance functions of laterally loaded pile groups in cohesionless soil
Naba Raj Shrestha; Masato Saitoh; Chandra Shekhar Goit; Alok Kumer Saha; Ryoya Yokota
Soils and Foundations, Volume：63, Number：4, First page：101340, Last page：101340, Aug. 2023, [Reviewed]
Elsevier BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.sandf.2023.101340
DOI ID：10.1016/j.sandf.2023.101340, ISSN：0038-0806 - Vertical impedance functions of pile groups under low-to-high loading amplitudes: numerical simulations and experimental validation
Usama Zafar; Chandra Shekhar Goit; Masato Saitoh; Riku Fukuda
EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION, May 2023, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1007/s11803-023-2183-y
DOI ID：10.1007/s11803-023-2183-y, ISSN：1671-3664, eISSN：1993-503X, ORCID：137591569, Web of Science ID：WOS:000989841200005 - Experimental and numerical investigations on vertical dynamic pile-to-pile interactions considering soil and interface nonlinearities
Usama Zafar; Chandra S. Goit; Masato Saitoh
Bulletin of Earthquake Engineering, Volume：20, Number：7, First page：3117, Last page：3142, May 2022, [Reviewed]
Springer Science and Business Media {LLC}, English, Scientific journal
DOI：https://doi.org/10.1007/s10518-021-01186-x
DOI ID：10.1007/s10518-021-01186-x, ISSN：1570-761X, ORCID：137591564 - Influence of nonlinearities on the vertical kinematic interaction of piles
Zafar U.; Goit CS; Saitoh M.
Proceedings of the 7th World Congress on Civil, Structural, and Environmental Engineering, Apr. 2022, [Reviewed]
English, International conference proceedings
DOI：https://doi.org/10.11159/icsect22.173
DOI ID：10.11159/icsect22.173 - Numerical Modelling of the Rate-Dependent Characteristics of Laterally Loaded Single Pile in Dry Sand
A. K. Saha; M. Saitoh; N. R. Shrestha; C. S. Goit
Lecture Notes in Civil Engineering, First page：73, Last page：80, Oct. 2021, [Reviewed]
Springer Singapore, English, In book
DOI：https://doi.org/10.1007/978-981-16-5547-0_8
DOI ID：10.1007/978-981-16-5547-0_8, ISSN：2366-2557, eISSN：2366-2565 - Frequency- and intensity-dependent impedance functions of laterally loaded single piles in cohesionless soil
Naba Raj Shrestha; Masato Saitoh; Alok Kumer Saha; Chandra Shekhar Goit
Soils and Foundations, Volume：61, Number：1, First page：129, Last page：143, Feb. 2021, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.sandf.2020.11.004
DOI ID：10.1016/j.sandf.2020.11.004, ISSN：0038-0806, ORCID：137591558, Web of Science ID：WOS:000614212500009 - Time control and experimental verification of IoT based structural seismic monitoring
Dang J.; Zuo R.; Goit CS
17th World Conference on Earthquake Engineering, Volume：Paper no. C001738, 2021, [Reviewed]
English, International conference proceedings - Effect of the joint shear resistance on the dynamic responses of steel pipe sheet pile foundations
Ullah MS; Sasaki A.; Goit CS; Saitoh M.
17th World Conference on Earthquake Engineering, Volume：Paper no. 4c-0046, 2021, [Reviewed]
English, International conference proceedings - Experimental and Numerical Analysis on the Rate-Dependent Cyclic Lateral Load on a Single Pile in Sand
Naba Raj Shrestha; Masato Saitoh; Chandra hekhar Goit; Alok Kumer Saha
International Journal of Civil Infrastructure, 2021, [Reviewed]
Avestia Publishing, English, Scientific journal
DOI：https://doi.org/10.11159/ijci.2021.002
DOI ID：10.11159/ijci.2021.002, eISSN：2563-8084 - Rate-Dependent Cyclic Lateral Load Test on a Single Pile in Sand
Naba Raj Shrestha; Masato Saitoh; Alok Kumer Saha; Chandra Shekhar Goit
Proceedings of the 5th International Conference on Civil, Structural and Transportation Engineering, Nov. 2020, [Reviewed]
Avestia Publishing, English, International conference proceedings
DOI：https://doi.org/10.11159/iccste20.231
DOI ID：10.11159/iccste20.231, ISSN：2369-3002, SCOPUS ID：85097226165 - Inclined single piles under vertical loadings in cohesionless soil
Chandra Shekhar Goit; Masato Saitoh; Takumi Igarashi; Shun Sasaki
Acta Geotechnica, Volume：16, Number：4, First page：1231, Last page：1245, Sep. 2020, [Reviewed], [Lead]
English, Scientific journal
DOI：https://doi.org/10.1007/s11440-020-01074-9
DOI ID：10.1007/s11440-020-01074-9, ISSN：1861-1125, eISSN：1861-1133, ORCID：81544209, Web of Science ID：WOS:000572721300006 - Effective Foundation Input Motion for Soil-Steel Pipe Sheet Pile (SPSP) Foundation System
Md. Shajib Ullah; Keisuke Kajiwara; Chandra Shekhar Goit; Masato Saitoh
Mechanisms and Machine Science, First page：135, Last page：148, Nov. 2019, [Reviewed]
Springer International Publishing, English, In book
DOI：https://doi.org/10.1007/978-3-030-27053-7_14
DOI ID：10.1007/978-3-030-27053-7_14, ISSN：2211-0984, eISSN：2211-0992, ORCID：81544215 - On the Behaviour of Raked Piles
Goit CS
Proceedings of the 6th International Conference on Engineering, Energy and Environment, First page：249, Last page：254, Nov. 2019, [Reviewed]
English, International conference proceedings - Earthquake motion filtering effect by pile foundations considering nonlinearity of soil and piles
Yudai Hochi; Yoshitaka Murono; Masato Saitoh; Chandra Shekhar Goit
Soil Dynamics and Earthquake Engineering, Volume：125, First page：105748, Last page：105748, Oct. 2019, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.soildyn.2019.105748
DOI ID：10.1016/j.soildyn.2019.105748, ISSN：0267-7261, eISSN：1879-341X, ORCID：67386451, Web of Science ID：WOS:000483627900046 - Frequency and intensity dependent dynamic responses of soil-steel pipe sheet pile (SPSP) foundation-superstructure system
Md. Shajib Ullah; Keisuke Kajiwara; Chandra Shekhar Goit; Masato Saitoh
Soil Dynamics and Earthquake Engineering, Volume：125, First page：105730, Last page：105730, Oct. 2019, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.soildyn.2019.105730
DOI ID：10.1016/j.soildyn.2019.105730, ISSN：0267-7261, eISSN：1879-341X, ORCID：67386435, Web of Science ID：WOS:000483627900035 - Development and Experimental Verification of IoT Sensing Based Structural Health Monitoring System
Zuo R.; Dang J.; Goit CS
Proceedings of the 5th International Conference on Experimental Vibration Analysis for Civil Engineering Structures, Volume：8, First page：99, Last page：107, 2019, [Reviewed]
English, International conference proceedings - On the verification of superposition method of kinematic interaction and inertial interaction in dynamic response analysis of soil-pile-structure systems
Md. Shajib Ullah; Hiroki Yamamoto; Chandra Shekhar Goit; Masato Saitoh
Soil Dynamics and Earthquake Engineering, Volume：113, First page：522, Last page：533, Oct. 2018, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.soildyn.2018.06.023
DOI ID：10.1016/j.soildyn.2018.06.023, ISSN：0267-7261, eISSN：1879-341X, ORCID：58919101, Web of Science ID：WOS:000447086000042 - Single pile under vertical vibrations in cohesionless soil
C. S. Goit; M. Saitoh
Géotechnique, Volume：68, Number：10, First page：893, Last page：904, Oct. 2018, [Reviewed]
The vertical response of a fixed-head floating single pile embedded in sand is obtained experimentally under 1g conditions. Specifically, pile head stiffnesses and axial strains generated along the pile length for a range of static and dynamic pile head loadings are measured. To account for the effects of soil non-linearity on the static response of the pile, a range of low- to high-magnitude static displacements is considered. Likewise, for the dynamic response, varying amplitudes of vertical harmonic accelerations for a wide range of frequencies are considered. Results obtained from the experiments under both the static and dynamic loading conditions indicate that the pile head stiffness is dependent on the direction of pile head loading – that is, whether the pile is pushed or pulled. To gain further insight into such direction-dependent pile head stiffness, three-dimensional non-linear finite-element analyses are carried out. Numerical results show very good agreement with the experimentally measured pile head stiffnesses. Axial strains generated along the pile length due to head loadings, on the other hand, depend on the amplitude of both the static and the dynamic loadings.
Thomas Telford Ltd., English, Scientific journal
DOI：https://doi.org/10.1680/jgeot.17.p.020
DOI ID：10.1680/jgeot.17.p.020, ISSN：0016-8505, eISSN：1751-7656, ORCID：58919058 - Influence of pile radius on the pile head kinematic bending strains of end-bearing pile groups
Mostafa Faghihnia Torshizi; Masato Saitoh; Guillermo M. Álamo; Chandra Shekhar Goit; Luis A. Padrón
Soil Dynamics and Earthquake Engineering, Volume：105, First page：184, Last page：203, Feb. 2018, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.soildyn.2017.10.007
DOI ID：10.1016/j.soildyn.2017.10.007, ISSN：0267-7261, eISSN：1879-341X, ORCID：58919103, SCOPUS ID：85037538875, Web of Science ID：WOS:000423893000017 - Dynamic Pile-to-Pile Interaction Factors for Inclined Pile Groups
Goit CS; Saitoh M.
Proceedings of the 5th International Conference on Engineering, Energy and Environment, First page：165, Last page：170, Nov. 2017, [Reviewed]
English, International conference proceedings - Pile-to-pile kinematic interaction factors for vertically-incident shear waves
Álamo GM; Saitoh M.; Goit CS; Padrón LA; Aznárez JJ; Maeso O.
2nd Global Conference on Applied Computing in Science and Engineering, Jul. 2017
English, Symposium - Experimental approach on the pile-to-pile interaction factors and impedance functions of inclined piles
C. S. Goit; M. Saitoh
GEOTECHNIQUE, Volume：66, Number：11, First page：888, Last page：901, Nov. 2016, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1680/jgeot.15.P.192
DOI ID：10.1680/jgeot.15.P.192, ISSN：0016-8505, eISSN：1751-7656, ORCID：40209803, Web of Science ID：WOS:000385390600003 - Principle of superposition for assessing horizontal dynamic response of pile groups encompassing soil nonlinearity
Chandra Shekhar Goit; Masato Saitoh; George Mylonakis
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, Volume：82, First page：73, Last page：83, Mar. 2016, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.soildyn.2015.11.001
DOI ID：10.1016/j.soildyn.2015.11.001, ISSN：0267-7261, eISSN：1879-341X, ORCID：40209804, Web of Science ID：WOS:000371361300007 - Expanded superposition method for impedance functions of inclined-pile groups
M. Saitoh; L. A. Padron; J. J. Aznarez; O. Maeso; C. S. Goit
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, Volume：40, Number：2, First page：185, Last page：206, Feb. 2016, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1002/nag.2389
DOI ID：10.1002/nag.2389, ISSN：0363-9061, eISSN：1096-9853, ORCID：40209802, Web of Science ID：WOS:000368153800002 - Effects of soil nonlinearity on the lateral impedance functions of inclined single piles
Goit CS; Saitoh M.
17th JSCE International Summer Symposium, Sep. 2015
English, Symposium - Model Tests on Horizontal Impedance Functions of Fixed-Head Inclined Pile Groups under Soil Nonlinearity
Chandra Shekhar Goit; Masato Saitoh
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, Volume：140, Number：6, Jun. 2014, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1061/(ASCE)GT.1943-5606.0001127
DOI ID：10.1061/(ASCE)GT.1943-5606.0001127, ISSN：1090-0241, eISSN：1943-5606, ORCID：40209806, Web of Science ID：WOS:000336250200019 - 近傍地盤の局所非線形性を考慮した斜杭基礎の動的水平インピーダンス特性に関する実験的研究
齊藤正人; Goit CS
First page：3772, Last page：3777, 2014
Japanese, Symposium - NONLINEAR KINEMATIC INTERACTION RESPONSE OF BATTER PILE^|^mdash;CENTRIFUGE VIBRATION TESTS
Takashi TAZOH; Jiho JANG; Yoichi TAJI; Hiroyuki KIMATA; Yasunobu SAKAI; Masato SAITOH; Chandra GOIT
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering ^|^ Earthquake Engineering (SE/EE)), Volume：70, Number：1, First page：51, Last page：66, 2014, [Reviewed]
Japan Society of Civil Engineers, Japanese, Scientific journal
DOI：https://doi.org/10.2208/jscejseee.70.51
DOI ID：10.2208/jscejseee.70.51, ISSN：2185-4653, eISSN：2185-4653, ORCID：58919021 - Effects of soil nonlinearity on the active length of piles embedded in cohesionless soil: model studies
C. S. Goit; M. Saitoh; H. Oikawa; H. Kawakami
Acta Geotechnica, Volume：9, Number：3, First page：455, Last page：467, Jun. 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1007/s11440-013-0257-0
DOI ID：10.1007/s11440-013-0257-0, ISSN：1861-1125, eISSN：1861-1133, ORCID：40209805, Web of Science ID：WOS:000336262100008 - Applicability of principle of superposition in obtaining horizontal impedance functions of pile groups under soil nonlinearity
Chandra S. Goit; Masato Saitoh; George Mylonakis
ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Proceedings - An IACM Special Interest Conference, First page：1145, Last page：1151, Jun. 2013, [Reviewed]
National Technical University of Athens, English, International conference proceedings
SCOPUS ID：84898940390 - Model tests on horizontal pile-to-pile interaction incorporating local non-linearity and resonance effects
Chandra Shekhar Goit; Masato Saitoh; George Mylonakis; Hideji Kawakami; Hiroki Oikawa
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, Volume：48, First page：175, Last page：192, May 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.soildyn.2013.02.002
DOI ID：10.1016/j.soildyn.2013.02.002, ISSN：0267-7261, ORCID：40209808, Web of Science ID：WOS:000317877900014 - Model tests and numerical analyses on horizontal impedance functions of inclined single piles embedded in cohesionless soil
Chandra Shekhar Goit; Masato Saitoh
EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION, Volume：12, Number：1, First page：143, Last page：154, Mar. 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1007/s11803-013-0158-0
DOI ID：10.1007/s11803-013-0158-0, ISSN：1671-3664, ORCID：40209807, Web of Science ID：WOS:000316213800013 - Seismic Behavior of Batter-Pile Foundation: Centrifuge Tests and Analytical Study
Tazoh T.; Sato M.; Jang J.; Taji Y.; Kimata H.; Kobayashi N.; Saitoh M.; Goit CS; Gazetas G.
The 3rd International Symposium on Advances in Urban Safety, Nov. 2012
English, Symposium - Model tests on validation of principle of superposition in obtaining pile groups’ horizontal impedance functions under soil non-linearity
Goit CS; Saitoh M.; Mylonakis G.
Proceedings of the International Symposium on Earthquake Engineering, Japan Earthquake Engineering Association, Volume：1, First page：191, Last page：198, 2012
English, Symposium - Advanced numerical modelling in tunnel design – The example of a major project in the UK
Goit CS; Kovacs A.; Thomas A.
2nd International FLAC/DEM Symposium, 2011
English, Symposium - Experimental Studies on Non-Linear Response of Soil-Pile-Structure Systems Subjected to Strong Ground Motion
Goit CS; Saitoh M.; Kawakami H.; Nishiyma S.
14th World Conference on Earthquake Engineering, 2008, [Reviewed]
English, International conference proceedings
- Seismic performance of pile foundations reinforced with micropiles
Rahman M.; Iwamura S.; Goit CS; Saitoh M.
18th East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-18), Nov. 2024 - Experimental studies on the kinematic response of micropiles-retrofitted bridge foundations
Goit CS; Maruyama Y.; Saitoh M.; Ekubo S.
18th World Conference on Earthquake Engineering, Jul. 2024 - 構造物と周辺地盤の地震応答を利用した 群杭基礎の水平動的ばね特性の推定手法の一提案
齊藤 正人; 横田 怜哉; 岡本 宙; ゴイト チャンドラ
土木学会第77回年次学術講演会講演概要集, Sep. 2023 - 地震応答を利用した群杭基礎の大変形領域における水平動的ばね特性の評価
齊藤正人; 横田怜哉; 岡本宙; Goit Chandra Shekhar
77回年次学術講演会概要集, Sep. 2022 - Influence of nonlinearities on the vertical kinematic interaction of piles
Zafar U.; Goit CS; Saitoh M.
7th World Congress on Civil, Structural, and Environmental Engineering, Apr. 2022 - Numerical modelling of the rate-dependent characteristics of laterally loaded single piles in dry sand
Alok Kumer Saha; Masato Saitoh; Naba Raj Shrestha; Chandra S Goi
5th International Conference on Advances in Civil Engineering (ICACE-2020), Mar. 2021 - Rate-dependent cyclic lateral load test on a single pile in sand
Shrestha NR; Saitoh M.; Saha AK; Goit CS
5th International Conference on Civil, Structural and Transportation Engineering, Nov. 2020 - Effect of the joint shear resistance on the dynamic responses of steel pipe sheet pile foundations
Ullah MS; Sasaki A.; Goit CS; Saitoh M.
17th World Conference on Earthquake Engineering, 2020 - Time control and experimental verification of IoT based structural seismic monitoring
Dang J.; Zuo R.; Goit CS
17th World Conference on Earthquake Engineering, 2020 - On the Behaviour of Raked Piles
Goit CS
6th International Conference on Engineering, Energy and Environment, Nov. 2019 - Development and Experimental Verification of IoT Sensing based Structural Health Monitoring System
Zuo R.; Dang J.; Goit CS
8th International Conference on Experimental Vibration Analysis for Civil Engineering Structures, Sep. 2019 - Effective foundation input motion for soil-steel pipe sheet pile (SPSP) foundation system
Ullah MS; Kajiwara K.; Goit CS; Saitoh M.
International Conference on Computational & Experimental Engineering and Sciences, Mar. 2019 - Dynamic Pile-to-Pile Interaction Factors for Inclined Pile Groups
Goit CS; Saitoh M.
5th International Conference on Engineering, Energy and Environment, Nov. 2017 - Pile-to-pile kinematic interaction factors for vertically-incident shear waves
Álamo GM; Saitoh M.; Goit CS; Padrón LA; Aznárez JJ; Maeso O.
2nd Global Conference on Applied Computing in Science and Engineering, Jul. 2017 - Effects of Soil Nonlinearity on the Lateral Impedance Functions of Inclined Single Piles
Chandra Shakhar Goi; Masato Saitoh
第70回年次学術講演会講演概要集, Sep. 2015 - Seismic Behavior of Batter-Pile Foundation: Centrifuge Tests and Analytical Study
Tazoh, T.; Sato, M.; Jang, J.; Taji, Y.; Kimata, H.; Kobayashi, N.; Saitoh, M.; Goit, C.; Gazetas, G.
3rd International Symposium on Advances in Urban Safety, Nov. 2013 - Applicability of principle of superposition in obtaining horizontal impedance functions of pile groups under soil nonlinearity
Goit CS; Saitoh M.; Mylonakis G.
4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2013), Jun. 2013 - 地盤の非線形性を考慮した杭間相互作用係数と Superposition Method の適用性に関する実験的研究
齊藤正人; Chandra Goi; George Mylonakis
第68回土木学会全国大会概要集ＣＤ, Mar. 2013 - Model tests on validation of principle of superposition in obtaining pile groups’ horizontal impedance functions under soil non-linearity
Goit, C. S.; Saitoh, M.; Mylonakis, G.
International Symposium on Earthquake Engineering, Nov. 2012 - Advanced numerical modelling in tunnel design – The example of a major project in the UK
Goit CS; Kovacs A.; Thomas A.
2nd International FLAC/DEM Symposium, Feb. 2011 - 単杭基礎の水平動的ばねの大変形時における収束特性の実験的評価
齊藤正人; Shrestha Raj Naba; Saha Kumer Alok; Goit Shekhar Chandra
70 回年次学術講演会講演概要集, Oct. 2009 - Experimental Studies on Non-Linear Response of Soil-Pile-Structure Systems Subjected to Strong Ground Motion
Goit CS; Saitoh M.; Kawakami H.; Nishiyma S.
14th World Conference on Earthquake Engineering, Oct. 2008
■ Research projects
- Significance of nonlinear soil-structure interaction (SSI) on the seismic performance of micropiles-retrofitted pile foundations
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Apr. 2022 - Mar. 2025
Goit Chandra, Saitama University, Principal investigator
Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
Grant number：22K04280 - Highly accurate evaluation of dynamic response of foundations subjected to large earthquake ground motions based on small earthquake events
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Apr. 2021 - Mar. 2024
Masato Saitoh; Goit Chandra, Saitama University
Grant amount(Total)：17030000, Direct funding：13100000, Indirect funding：3930000
Grant number：21H01414 - Highly accurate computational method for dynamic response of structure systems supported by pile foundations allowing yielding behavior in capacity design
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Apr. 2018 - Mar. 2021
Saitoh Masato; Goit Chandra, Saitama University, Coinvestigator
Grant amount(Total)：13000000, Direct funding：10000000, Indirect funding：3000000
In recent years, there have been reported that several cases in which foundations were severely damaged during earthquake events. An increase in the amplitude of loading transmitting to soil-foundation systems is attributed to inelastic behavior of the system, thus leading to intricate combination of failure mechanisms and wave propagations. This research conducted experimental and numerical studies of single piles and pile groups for prevailing the relation between yielding procedures and frequency-dependent characteristics in the systems. This study proposed a new phenomenological model that can consider both the intensity and frequency dependencies of the systems. The model was verified by comparing the impedance functions and their convergence trends with the amplitude of loadings obtained from the experiments. This study finally proposed the applicability of the proposed model based on the yielding level.
Grant number：18H01517 - Impedance functions of an interlocking Steel Pipe Sheet Pile (SPSP) caisson foundation under nonlinear soil-structure interaction (SSI)
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), 01 Apr. 2017 - 31 Mar. 2019
Goit Chandra, Saitama University
Grant amount(Total)：4290000, Direct funding：3300000, Indirect funding：990000
Nonlinear dynamic response of a Steel Pipe Sheet Pile (SPSP) foundation is studied through model testing under 1g conditions, accounting for the effects of soil-structure interactions (SSI). A circular 1/16.5 model SPSP foundation comprising of 20 hollow circular aluminum pipes (outer diameter = 30 mm and wall thickness = 2 mm) with lengths of 960 mm, embedded in dry cohesionless soil, was considered. Specifically, the kinematic and inertial responses of the foundation were obtained in the form of kinematic interaction factors (KIF) and head level horizontal impedance functions (hIFs) under a low-to-high level of dynamic loading for a broad range of frequencies. Results obtained through this work show that both the KIF and hIFs (essential components for SSI calculations) are dependent on soil nonlinearity. In the light of such, it can be inferred that the general methodologies that assumes soil as an elastic or visco-elastic material may not be conservative for the analysis and design.
Grant number：17K14713 - 強震時における高層建物支持機構の解明と非線形メカニカルインターフェースの創成
24 Apr. 2015 - 31 Mar. 2016
Grant amount(Total)：1200000, Direct funding：1200000
Grant number：15F14367 - Experimental Evaluation of Pile-to-Pile Interaction and Impedance Functions with Local Nonlinearity in Soils
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 2011 - 2013
SAITOH Masato, Saitama University
Grant amount(Total)：5460000, Direct funding：4200000, Indirect funding：1260000
This study dealt with impedance functions (IFs) of pile groups subjected to strong vibrations due to earthquakes. IFs are defined as dynamic stiffness and damping representing dynamic characteristics at the interface between superstructure and soil-foundation systems. In general, impedance functions have been evaluated under linear-elastic conditions of soils. However, in accordance with the recent earthquake events, strong ground motions and resultant high amplitude of structural response may generate strong nonlinearity in soils near the piles. Therefore, this study conducted model tests on fixed-head floating piles embedded in cohesionless soil carried out under 1-g conditions, to investigate the effects of local soil nonlinearity on the impedance characteristics of pile groups. Results obtained from such tests indicate that soil nonlinearity markedly change impedance characteristics.
Grant number：23560562