Effects of the geometrical parameters of the core on the mechanical behavior of sandwich honeycomb panel Settet T. Ahmed, Salah Aguib, Djedid Toufik, Chikh Noureddine and Chellil Ahmed
Abstract; Full Text (1909K) .	pages 473-488.	DOI: 10.12989/csm.2019.8.6.473

Abstract
The present work is the study of mechanical behavior due to variation of the geometrical parameters in the core of the sandwich honeycomb panel. This study has allowed us to increase or decrease the strains and stresses of the panel, in changing the angle of alveolus, as explained and described below. In taking into consideration the results obtained previously to improve the mechanical properties and increase the adhesion of different parts of the panel, without changing the adhesive, we have conceived two new models, in increasing the contact surfaces in boundary of each part of the panel and giving a conical hexagonal shape in his corp.

Key Words
honeycomb structure; finite element simulation; delamination; conical hexagonal shape

Address
Settet T. Ahmed, Salah Aguib, Djedid Toufik, Chikh Noureddine and Chellil Ahmed: Dynamic Motors and Vibroacoustic Laboratory, M\'Hamed Bougara University of Boumerdes, Algeria

Models for drinking water treatment processes Suvada Jusic, Zoran Milasinovic, Hata Milišić and Emina Hadzic
Abstract; Full Text (1559K) .	pages 489-500.	DOI: 10.12989/csm.2019.8.6.489

Abstract
With drinking water standards becoming more rigorous and increasing demands for additional water quantities, while water resources are becoming more polluted, mathematical models became an important tool to improve water treatment processes performance in the water supply system. Water treatment processes models reflect the knowledge of the processes and they are useful tools for water treatment process optimization, design, operator training for decision making and fundamental research. Unfortunately, in the current practice of drinking-water production and distribution, water treatment processes modeling is not successfully applied. This article presents a review of some existing water treatment processes simulators and the experience of their application and indicating the main weak points of each process. Also, new approaches in the modeling of water treatment are presented and recommendations are given for the work in the future.

Key Words
active control; dynamics; granular materials; water quality; water treatment; plant; process modeling

Address
Suvada Jusic, Zoran Milasinovic, Hata Milišić and Emina Hadzic: Department of Water Resources and Environmental Engineering, Faculty of Civil Engineering, The University of Sarajevo, 30 Patriotske lige, Sarajevo, Bosnia–Herzegovina

Axisymmetric deformation in transversely isotropic thermoelastic medium using new modified couple stress theory Parveen Lata and Harpreet Kaur
Abstract; Full Text (1286K) .	pages 501-522.	DOI: 10.12989/csm.2019.8.6.501

Abstract
The present study is concerned with the thermoelastic interactions in a two dimensional axisymmetric problem in transversely isotropic thermoelastic solid using new modified couple stress theory without energy dissipation and with two temperatures. The Laplace and Hankel transforms have been employed to find the general solution to the field equations. Concentrated normal force, normal force over the circular region, concentrated thermal source and thermal source over the circular region have been taken to illustrate the application of the approach. The components of displacements, stress, couple stress and conductive temperature distribution are obtained in the transformed domain. The resulting quantities are obtained in the physical domain by using numerical inversion technique. The effect of two temperature varying by taking different values for the two temperature on the components of normal stress, tangential stress, conductive temperature and couple stress are depicted graphically.

Key Words
transversely isotropic; thermoelastic; Laplace transform; Hankel transform; concentrated and distributed sources; new modified couple stress

Address
Parveen Lata and Harpreet Kaur: Department of Basic and Applied Sciences, Punjabi University, Patiala, Punjab, India

Spatial interpolation of SPT data and prediction of consolidation of clay by ANN method Hyeong-Joo Kim, Peter Rey T. Dinoy, Hee-Seong Choi, Kyoung-Bum Lee and Jose Leo C. Mission
Abstract; Full Text (1597K) .	pages 523-535.	DOI: 10.12989/csm.2019.8.6.523

Abstract
Artificial Intelligence (AI) is anticipated to be the future of technology. Hence, AI has been applied in various fields over the years and its applications are expected to grow in number with the passage of time. There has been a growing need for accurate, direct, and quick prediction of geotechnical and foundation engineering models especially since the success of each project relies on numerous amounts of data. In this study, two applications of AI in the field of geotechnical and foundation engineering are presented – spatial interpolation of standard penetration test (SPT) data and prediction of consolidation of clay. SPT and soil profile data may be predicted and estimated at any location and depth at a site that has no available borehole test data using artificial intelligence techniques such as artificial neural networks (ANN) based on available geospatial information from nearby boreholes. ANN can also be used to accelerate the calculation of various theoretical methods such as the one-dimensional consolidation theory of clay with high efficiency by using lesser computation resources. The results of the study showed that ANN can be a valuable, powerful, and practical tool in providing various information that is needed in geotechnical and foundation design.

Key Words
geotechnical and foundation design; artificial intelligence; artificial neural networks; SPT; soil profile data; consolidation

Address
Hyeong-Joo Kim: Department of Civil Engineering, Kunsan National University, Gunsan 51540, Republic of Korea

Peter Rey T. Dinoy, Hee-Seong Choi and Kyoung-Bum Lee: Department of Civil and Environmental Engineering,
Kunsan National University, Gunsan 51540, Republic of Korea

Jose Leo C. Mission: Horizon Survey Company (FZC), P6-31, SAIF Zone, Sharjah, United Arab Emirates

Geometrically exact initially curved Kirchhoff Ismar Imamovic, Adnan Ibrahimbegovic and Emina Hajdo
Abstract; Full Text (2166K) .	pages 537-553.	DOI: 10.12989/csm.2019.8.6.537

Abstract
In this paper we present geometrically exact Kirchhoff\'s initially curved planar beam model. The theoretical formulation of the proposed model is based upon Reissner\'s geometrically exact beam formulation presented in classical works as a starting point, but with imposed Kirchhoff\'s constraint in the rotated strain measure. Such constraint imposes that shear deformation becomes negligible, and as a result, curvature depends on the second derivative of displacements. The constitutive law is plasticity with linear hardening, defined separately for axial and bending response. We construct discrete approximation by using Hermite\'s polynomials, for both position vector and displacements, and present the finite element arrays and details of numerical implementation. Several numerical examples are presented in order to illustrate an excellent performance of the proposed beam model.

Key Words
Kirchhoff beam; rotated strain measure; Hermite\'s polynomials; elasto-plastic response

Address
Ismar Imamovic and Emina Hajdo: Faculty of Civil Engineering, University of Sarajevo, Sarajevo, Bosnia and Herzegovina

Adnan Ibrahimbegovic: University of Technology of Compiegne/Sorbonne University Alliance, Compiegne, France