Bulletin of Research Center for Computing and Multimedia Studies
Vol.30, 2016 ISSN 1882-7694
Discrete Limit Analysis for Framed Structures by using Hybrid-type Penalty Method
Kiyomichi Yamaguchi, Norio Takeuchi
Received: January 22, 2016 PDF Abstract
In this study, bar elements for the hybrid-type penalty method (HPM) are developed. In this method for calculating the displacement field, it is assumed that an independent linear displacement field for the axial direction and an independent third-order displacement field for the bending of each element are combined. This model has six degrees of freedom: strain, gradient of strain, and the rigid-body displacement of the center of gravity of the elements. The continuity conditions of displacement are incorporated by using a penalty function. The elastic solution obtained with this method is consistent with the exact solution. The incremental loading method is used in the proposed discrete limit analysis. Because this method generates each plastic hinge sequentially, the progress of destruction can be followed. Accurate collapse loads and modes were obtained using numerical analysis.
Structure of Charged Colloidal Dispersion by Molecular Dynamics
Received: March 8, 2016 PDF Abstract
The ordered structure of charged colloidal dispersion is studied by molecular dynamics simulation. Sogami-Ise potential is assumed as the effective interaction between the colloidal particles. The volume fraction is fixed as 0.01. The initial configuration of the basic cell is face centered cubic (FCC). The final configurations are liquid, FCC or void structure according to the charge density on the surface of the colloidal particle.
A continued report: Phase Equilibria of a Lennard-Jones System Obtained through Constant-Pressure Molecular Dynamics Simulations
Yuri Yamada, Yosuke Kataoka
Received: March 9, 2016 PDF Abstract
We had reported a scheme that obtains solid-liquid, liquid-gas, or solid-gas equilibria of a Lennard-Jones 12-6 system through constant-pressure molecular dynamics simulations (Kataoka and Yamada, 2014-2015). This article shows a continued report about more-improved details of the scheme: Primary, an initial configuration that contains both fcc crystal phase and the gas phase in an elongated rectangular unit cell is developed. The configuration can obtain solid-gas equilibrium rapidly at the low pressure. Secondary, a dependence on the crystal orientation for the solid-liquid or solid-gas equilibria is investigated. Although the solid-liquid equilibrium temperature slightly depends on the crystal orientation, the solid-gas equilibrium temperature is hardly so.
Dynamic Analysis of the Half Infinite Ground Model by CIP Method Two Dimensional In-Plane Wave Problems
Syuhei Matsushita, Keisuke Nakamura, Nagayuki Yoshida
Received: March 18, 2016 PDF Abstract
Nonlinear dynamic behavior for the ground has been studied actively. In the nonlinear problem, The
(FEM) is known as an effective and flexible method. However, this method cannot simulate the infinite ground model since it is the analysis for the finite region. Therefore, we need to make a virtual boundary on a proper position. We call it the non-reflective boundary processing. Generally, the viscous boundary is used for this processing. But, this method cannot realize the non-reflection on the virtual boundary perfectly. The CIP method is to calculate the advection equation with high precision. The CIP method is used in various fields, but almost not used in the problem of the ground. In this paper, we suggest a new boundary processing using the CIP method by ecomposing the equation of motion into the advection equation.
Dihedral-Angle Dependence of the Substituent Effects on the Gas-Phase Stabilities of Benzoate Anions
Kazuhide Nakata, Mizue Fujio
Received: March 22, 2016 PDF Abstract
Relative gas-phase stabilities of ring-substituted benzoate anions, of which the dihedral angle φ between the benzene ring and the COO– planes was fixed, were computationally determined utilizing isodesmic reactions. The energies of respective species involved in the reactions were calculated by B3LYP/6-311+G(2d,p) level of theory. The φ was varied from 0 ̊ to 90 ̊ by steps of 10 ̊. Obtained 10 kinds of substituent effects were analyzed by an extended Yukawa-Tsuno equation: –ΔEX =ρ(σ0 +r−ΔσR− +sΔσS). Resultant r– value increased from -0.03 (φ=0 ̊) to 0.38 (φ=90 ̊) with the increase of the φ. To reveal the mechanism of the through-resonance in benzoate anions, NBO analyses were performed. It has become apparent that the donation of electrons from the lone pairs on the O atoms to the benzene π-electron system is crucial to the through-resonance in twisted benzoate anions.
Earthquake Resistance Analysis of RC Structures by Reduced Layer Model -Osone Elementary School-
Yosuke Komeichi, Kizuku Kimura, Yuuto Kawai, Nagayuki Yoshida
Received: March 26, 2016 PDF Abstract
This study proposes a simple elasto-plastic analysis for the dynamic earthquake resistance diagnosis. The reduced layer model is very effective to get the total judgment quickly. The basic data for a building is obtained by microtremor observation together with its plan and measurement. The numerical results are certificated by the analysis based on the three dimensional frame model and the observation data