Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))
Online ISSN : 2185-4661
ISSN-L : 2185-4661
Volume 70 , Issue 1
Showing 1-2 articles out of 2 articles from the selected issue
Paper (In Japanese)
  • Takao YAMANISHI
    2014 Volume 70 Issue 1 Pages 1-9
    Published: 2014
    Released: February 20, 2014
    JOURNALS FREE ACCESS
     In recent years, many pile driving analysis methods are proposed and it is applied to the analysis of actual pile driving. However, there are few papers written in detail about the separation section event (ram, anvil, adapter, pile) which occurs on an actual pile driving, and impulse force influenced by the separation section event.
     In this paper, the above-mentioned subjects proposes that it is theoretically solvable by using an advection equation. An advection equation is drawn in the process in which the general solution (d'Alembert's solution) of a one-dimensional wave equation is solved. And, how to apply an advection equation to the pile driving analysis simulation was also described. Moreover, the validity of this simulation was confirmed by comparing with two or more examples.
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  • Ryosuke KASAI, Junji KATO, Kazuyuki NAKAHATA, Takashi KYOYA, Atsushi O ...
    2014 Volume 70 Issue 1 Pages 10-21
    Published: 2014
    Released: June 20, 2014
    JOURNALS FREE ACCESS
     The present study proposes an estimation curve of crack-depth for the surface of a homogeneous body in terms of numerical simulations based on the impact elastic wave method, specifically the elastodynamic finite integration technique. A rectangular solid specimen with a specified opened crack is modeled for the numerical simulation. Giving Ricker wavelet to the specimen model, we observed the attenuation of wave passing through a prescribed surface crack on the specimen.
     It was concluded from the numerical investigation that the magnitude of attenuation strongly depends on the ratio of wavelength to crack-depth, but hardly on materials used. According to these outputs, the present study formulated the estimation curve of crack-depth and proposed an entire procedure to evaluate crack-depth on the surface of homogeneous body in practical use.
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