Papers - Nagai Hiroshi

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  1. Influence of helical wings on pull-out resistance of piles in sand

    Hiroshi Nagai, Atsunori Ikeda, Yuta Sato，Geotechnical and Geological Engineering，vol.43，(6)，(p.1 ～ 15)，Article Number:259，2025.08

  2. Simplified calculation on horizontal dynamic impedance of piled raft foundation on layered soil

    Hiroshi Nagai, Tomoki Takai, Yurina Yasuda，Geotechnical and Geological Engineering，vol.42，(8)，(p.7835 ～ 7846)，2024.11

  3. Pile shaft resistance partially overlapping with backfilled soils of various properties

    Hiroshi Nagai, Yoshiki Kashitani, Kenta Nakamura，International Journal of GEOMATE，vol.27，(123)，(p.92 ～ 99)，2024.11

  4. Effects of variation in soil parameters on resistance factors of bearing capacity of piles

    鈴木 比呂子，安 浩輝，鈴木 康嗣，永井 宏，AIJ Jornal of technology and design，vol.30，(76)，(p.1223 ～ 1228)，2024.10

  5. Influence of backfilled sand dimensions and location on shaft resistance of piles

    Kenta Nakamura, Hiroshi Nagai，International Journal of GEOMATE，vol.Vol. 25，(110)，(p.197 ～ 204)，2023.10

  6. DEFORMATION CHARACTERISTICS OF CONCRETE-FILLED DOUBLE STEEL PIPE PILE SUBJECTED TO HORIZONTAL LOAD AND ITS CALCULATION METHOD

    永井　宏，池田篤則，Journal of Structural Engineering B，vol.Vol.69B，(p.326 ～ 335)，2023.04

  7. SHAFT RESISTANCE MECHANISM FOR PILES CLOSE TO BACKFILLED SAND AND ITS EVALUATION

    Hiroshi Nagai，Kenta Nakamura，International Journal of GEOMATE，vol.Vol. 23，(98)，(p.84 ～ 91)，2022.10

  8. SHAFT RESISTANCE OF PILES CLOSE TO BACKFILLED SAND COLUMNS

    Hiroshi Nagai，International Journal of GEOMATE，vol.Vol. 21，(84)，(p.121 ～ 128)，2021.08

  9. EVALUATION OF DYNAMIC INTERACTION FACTOR OF RECTANGULAR PILED RAFT FOUNDATION FOR HORIZONTAL AND ROTATIONAL MOTION

    Hiroshi Nagai，International Journal of GEOMATE，vol.Vol. 20，(77)，(p.107 ～ 115)，2021.01

  10. DYNAMIC INTERACTION FACTOR OF PILED RAFT FOUNDATION SUBJECTED TO VERTICAL LOADING

    Hiroshi Nagai，International Journal of GEOMATE，vol.Vol.18，(69)，(p.168 ～ 175)，2020.05

  11. AXIAL COMPRESSION DEFORMATION OF CONCRETE-FILLED DOUBLE STEEL PIPE PILE AND ITS CALCULATION METHOD

    永井宏，池田篤則，佐藤雄太，山口湧也，足立啓輔，Journal of Structural Engineering B，vol.Vol.66B，(p.245 ～ 252)，2020.03

  12. Simplified method of estimating the dynamic impedance of a piled raft foundation subjected to inertial loading due to an earthquake

    Hiroshi Nagai，Computers and Geotechnics，vol.Vol.105，(p.69 ～ 78)，2019.01

  13. Influence of installation method on performance of screwed pile and evaluation of pulling resistance

    Hiroshi Nagai，Tsutomu Tsuchiya，Masao Shimada，Soils and Foundations，vol.Vol.58，(2)，(p.355 ～ 369)，2018.04

  14. STATISTICAL STUDY ON LOAD-SETTLEMENT CHARACTERISTICS TOE OF SCREW PILES

    土屋　勉，永井　宏，下奈津実，AIJ Jornal of technology and design，vol.第22，(第52)，(p.915 ～ 918)，2016.10

  15. Lateral resistancecharacteristics of screwed pile with soil improvement raround pile head

    永井　宏，土屋　勉，池田篤則，佐藤雄太，島田正夫，Japanese Geotechnical Journal，vol.Vol.11，(No.2)，(p.127 ～ 137)，2016.06

  16. AN ANALYTICAL STUDY ON FOUNDATION INPUT MOTION OF NEW PILE FOUNDATION WITH OLD PILES LEFT UNDERGROUND

    永井　宏，土屋　勉，葛西　勇紀，Journal of Structural Engineering，vol.Vol.62B，(p.395 ～ 404)，2016.03

  17. Model tests of pulling resistance of helical screw piles - The effect of embedment of a helical screw pile into a bearing layer -

    中沢楓太，土屋 勉，永井 宏，島田正夫，岡 聖也，Journal of Structural and construction Engineering，vol.第80，(第714)，(p.1279 ～ 1286)，2015.08

  18. SEISMIC RESPONSE ANALYSIS OF PILED RAFT FOUNDATION CONSIDERING STRUCTURE-FOUNDATION-SOIL INTERACTION Part 2 Influence of natural period of super-structure and subsurface structure

    永井　宏，土屋　勉，阿部一茂，Journal of Structural Engineering，vol.Vol.61B，(p.481 ～ 488)，2015.03

  19. AN EQUIBALENT PIER METHOD FOR VERTICAL STIFFNESS OF PILE GROUPS

    土屋　勉，永井　宏，北原進之介，AIJ Jornal of technology and design，vol.第20，(第46)，(p.929 ～ 932)，2014.10

  20. A SIMPLE APPROACH FOR ESTIMATING STIFFNESS AND PILE HEAD LOAD OF PILED RAFT SUBJECTED TO VERTICAL AND HORIZONTAL LOAD

    土屋　勉，永井　宏，兼平哲郎，北原進之介，Journal of Structural Engineering，vol.Vol.60B，(p.107 ～ 114)，2014.03

  21. SEISMIC RESPONSE ANALYSIS OF PILED RAFT FOUNDATION CONSIDERING STRUCTURE-FOUNDATION-SOIL INTERACTION-Consideration on building response and pile stress-

    永井　宏，土屋　勉，阿部一茂，Journal of Structural Engineering，vol.Vol.59B，(p.277 ～ 282)，2013.03

  22. A new formula for the toe resistance of a helical screw pile considering the defferent load sharing bearing mechanism at the cloased end and the helix

    池田篤則，土屋　勉，永井　宏，AIJ Jornal of technology and design，vol.第18，(第40)，(p.877 ～ 882)，2012.10

  23. Study on simple apploach for behavior of piled raft foundation -Vertical stiffness and pile head load-

    土屋　勉，長尾俊昌，永井　宏，AIJ Jornal of technology and design，vol.第77，(第679)，(p.1421 ～ 1427)，2012.09

  24. IN-SITU VERTICAL LOADING TESTS OF PILED RAFT FOUNDATION ON HIGHLY ORGANIC SOFT GROUND

    土屋　勉，青木　涼，永井　宏，AIJ Jornal of technology and design，vol.第17，(第36)，(p.483 ～ 486)，2011.06

  25. An analytical study of piled raft and pile groups subjected to lateral displacement of soils

    土屋　勉，永井　宏，中澤公博，Journal of Structural Engineering，vol.Vol.55B，(p.631 ～ 637)，2009.03

  26. AN ANALYTICAL STUDY ON NONLINEAR BEHAVIOR OF PILED RAFT FOUNDATION SUBJECTED TO HORIZONTAL LOAD

    永井　宏，土屋　勉，Journal of Structural Engineering，vol.Vol.52B，(p.1 ～ 8)，2006.03

  27. A NONLINEAR HYBRID ANALYSIS FOR PILE GROUPS SUBJECTED TO GROUND SUBSIDENCE

    土屋　勉，永井　宏，惣蔵潤一，Journal of Structural Engineering，vol.Vol.52B，(p.9 ～ 14)，2006.03

  28. A plactical approach for sttlement of building suported by piled-raft

    土屋　勉，池田隼人，永井　宏，AIJ Jornal of technology and design，(第22)，(p.167 ～ 170)，2005.12

  29. NONLINEAR ANALYTICAL MODEL FOR PILED RAFT FOUNDATION SUBJECTED TO HORIZONTAL LOAD AND APPLICATION OF IN-SITU LATERAL LOADING TESTS

    永井　宏，土屋　勉，Journal of Structural and construction Engineering，(第589)，(p.113 ～ 119)，2005.03

  30. IN-SITU LATERAL LOADING TESTS OF PILED RAFT FOUNDATION FOCUSED ON CONNECTING CONDITION AT PILE HEAD

    永井　宏，土屋　勉，Journal of Structural and construction Engineering，(第579)，(p.47 ～ 53)，2004.05

  31. AN ANALYTICAL STUDY ON BEHAVIOR OF PILED RAFT SUBJECTED TO SEISMIC LOAD

    土屋　勉，永井　宏，池田篤則，Journal of Structural Engineering，vol.Vol.48B，(p.343 ～ 350)，2002.03

  32. AN ANALYTICAL STUDY ON STRESS AND DISPLACEMENT OF PILED RAFT SUBJECTED TO VERTICAL LOAD

    土屋　勉，永井　宏，Journal of Structural Engineering，vol.Vol.47B，(p.375 ～ 380)，2001.03

  33. An analytical study on vertical loaded pile groups

    土屋　勉，永井　宏，大築和夫，情報・システム・利用・技術シンポジウム論文集，vol.Vol.22，(p.43 ～ 48)，1999.12

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