Papers - Nagai Hiroshi

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