CVClient

Naoya Shojo

  (荘所 直哉)

Profile Information

Affiliation
School of Human Science and Environment, University of Hyogo
Degree
博士(工学)(Mar, 2004, 広島大学)

J-GLOBAL ID
200901056210253061
researchmap Member ID
6000014457

Research Interests

 1

Papers

 20
  • Study on In-Plane Shear Performance of Shear Walls Using Aerated Cement Board
    (26), Mar, 2024  Peer-reviewed
  • Kimiko Miyoshi, Yoichi Hayasaki, Naoya Shojo, Yoshimitsu Ohashi
    SAHC 2023: Structural Analysis of Historical Constructions, 112-124, Sep, 2023  Peer-reviewed
  • MIYOSHI Kimiko, HAYASAKI Yoichi, SYOJO Naoya, OHASHI Yoshimitsu
    Journal of Structural and Construction Engineering (Transactions of AIJ), 84(761) 937-947, 2019  Peer-reviewed
    Wall clay test specimens using different mixing ratios and materials were fabricated using Kumamoto (Yatsushiro, Taragi, Aso, and Amakusa), Saitama, and Kyoto’s new soil and some reused soil. To understand the mechanical properties of the mud wall, a compression test and a double shear test were conducted. Then, multiple regression analysis was performed using this data to calculate the estimation formula of compressive strength (σmax) and shear strength (τmax). First, the compression test of a 150×150×60 mm block and the double shear test of a 60×60×180 mm block were conducted, and the following items were confirmed. In the new soil of Yatsushiro,  ・As the compression specimen size decreased in size to a 100×100×60 mm block, the σmax and its dispersion increased.  ・The σmax of the second coating soil was higher than that of the first coating soil, but τmax slightly varied. In addition, the second coating soil displayed brittle fracture behavior, but the first coating soil had a relatively higher degree of toughness.  ・The σmax of some reused soil was higher than that of new soil, but σmax and τmax did not increase even when these soils were mixed.  ・Even when the straw content was increased from 5% to 8%, σmax and τmax remained approximately unchanged.  ・In the matured period from 7 to 90 days, σmax and τmax increased by 1.2–1.3 times.  ・Even when the quantity of sand in the second coating soil increased, σmax, Young's modulus, and shear stiffness decreased.  ・When the specimens were classified into coarse-grained soil and fine grained soil, the σmax of the coarse-grained soil was higher than that of fine-grained soil. However, the τmaxmax of the coarse-grained soil and the reused soil were 0.6–0.7, that of the fine-grained soil was 0.8–1.0, and their strength ratios were classified into two groups.  ・The influence of soil appeared to be significant in the new Kyoto soil.  The following results were obtained using multiple regression analysis:  ・The σmax of the first and second coating soil had the highest correlation with the clay mass percentage and the water content of the mud plaster (correlation coefficient R = −0.9). τmax had the highest correlation with the plasticity index and the air-dried water content of the wall clay (R = −0.85).  ・It was possible to estimate σmax using the explanatory variables of (1) and (2), where (1) is the fine sand mass percentage and density and water content of mud plaster of first and second coating soil, and (2) is the coarse fraction mass percentage, plastic limit, and air-dried water content of first coating soil.  ・τmax could be estimated by explanatory variables of mud plaster density, fine sand mass percentage, plasticity index, and air-dried water content of first coating soil, but it could be also estimated by the average of σmax, which is classified as coarse-grained or fine-grained soil.  However, these multiple regression equations have a relatively low degree of general versatility because the specimen shape, the type of material, and mixing ratio are limited. In the future, we will further increase the soil type and derive a multiple regression equation of high general versatility.
  • K. Miyoshi, Y. Hayasaki, N. Shojo, Y. Ohashi
    World Conference on Timber Engineering 2018, (TRD-P-11), Aug, 2018  Peer-reviewed
  • World Conference on Timber Engineering 2018, (TRD-P-03), Aug, 2018  Peer-reviewed

Misc.

 68

Books and Other Publications

 2

Presentations

 63

Teaching Experience

 7

Professional Memberships

 2

Research Projects

 8