Behaviour of FRP Confined Concrete Cylinders: Experimental Investigation and Strength Model

The present paper is devoted to investigate the behaviour of FRP confined concrete cylinders subjected under axial compressive loading. A total of 54 FRP confined concrete cylinders with 2 types of FRP composite wrap, Carbone fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP), were tested under monotonic axial compression. The effects of several parameters such as unconfined concrete strength, type of FRP composite and number of FRP layers are investigated. Three different concrete mixes were examined, with a compressive strengths average of 26, 40 and 60MPa. The effective circumferential FRP failure strain and the effect of the effective lateral confining pressure were investigated. Peak axial compressive strength and corresponding strain of unconfined and FRP confined concrete cylinders were compared. The obtained results show that the CFRP reinforced cylinders provide a significant increase in ultimate compression stress compared to the GFRP reinforced ones. A new model is presented to predict the compressive axial strength and corresponding strain of FRP confined columns

De l’eau pour un développement durable : enjeux et stratégies

Le développement socio-économique d’un pays, d’une région, est un objectif principal de tout gouvernant; hélas, cela affecte inévitablement les ressources d’eau tant sur la qualité du fait de la pollution domestique et industrielle que sur la quantité puisque la consommation augmente de façon vertigineuse.Il est désormais largement admis que la mise en place d’un développement durable exige de mettre en équation des préoccupations sociales et économiques avec des préoccupations environnementales en tenant compte du facteur essentiel et limite, à savoir l’eau.L’Algérie est un des pays du Nord du bassin méditerranéen qui souffre de la pénurie d’eau. Les écoulements en eau y sont caractérisés par une irrégularité saisonnière et interannuelle importante et par une violence et une rapidité des crues. En effet, la connaissance des conditions climatiques joue un rôle important dans les études de planification économique; elle permet de mieux maîtriser les apports non contrôlés qui engendrent le bon fonctionnement du système de prévision et de gestion des ressources hydriques à court, moyen et long termes.Le développement durable consiste entre autres à mettre au point des systèmes d’information, de gestion des risques et de prévision des catastrophes naturelles et à mettre en place des systèmes de détection précoce et de contrôle, ainsi que des plans d’intervention en cas d’urgence dans les zones prédéterminées.Nous développerons dans cet article les points suivants :Une série de recommandations sont exposées pour résoudre le problème de crise de l’eau et pour un développement durable.The socio-economical development of a country or a region is the main objective of all managers; however, this affects inevitably the water resources in terms of quality related to domestic and industrial pollution, and also quantity due to increasing consumption use.Henceforth, a sustainable development requires taking into consideration the social and the economical as well as environmental factors.Algeria is one of the northern countries of the Mediterranean basin which suffers from water shortage. The river flows are characterized by important seasonal and inter-year irregularities, especially in flood periods. Indeed, the knowledge of the climatic conditions has an important role in the economical planning: it permits the best management of the uncontrolled flows for short, mean, and long term.The sustainable development requires taking a number of steps, among others, development of information system, management and prediction of the risks, forecasting natural disasters, implementation of systems of early detection, as well as plans of intervening in case of emergency. We develop in this article:A set of recommendations is given in order to solve the problem of crisis of the water and for sustainable development

Comparing nonlinear regression analysis and ‎artificial neural networks to predict geotechnical ‎parameters from standard penetration test

At the beginning the twenty-first century, a lot of high-level methods have become ‎available in geotechnical engineering in order to deal with the complexity and ‎heterogeneity encountered in soil, Statistical modeling (i.e. regression analysis method) ‎was used to estimate the relationships among two or more variables, however in the early ‎nineties an application of a new system emerged which gave excellent results in solving a ‎lot of problems by learning from the available data so-called ”artificial neural network”.‎ The aim of this study is to apply both methods, nonlinear regression analysis and ‎artificial neural networks in order to predict geotechnical parameters from standard ‎penetration test in all soil’s types; Comparison of the results using correlation’s ‎coefficient (R) and Root Mean Squared Error (RMSE) is done between both methods; ‎About 400 samples, over 65 boreholes in the Algiers area have been collected and were ‎used in this study, The results show the superiority of ANN‎ method in predicting data ‎that seems closer to experimental values compared to NRA method

Use of GIS systems to analyze soil compressibility, swelling and bearing capacity under superficial foundations in Algiers region, Algeria

Nowadays, information about geotechnical parameters and future stability of soil is highly demanded by geotechnical laboratories and companies. The use of geotechnical information systems integrated in a GIS offers a better manipulation of the geotechnical parameters of different sites for a general exploitation of storage, manipulation, management and analysis of geotechnical data. The aim of the current research is to present the results of studies developed to set up a geotechnical database for Algiers region using «Géo-Base» information system developed within the framework of this research and integrated in a GIS through a descriptive statistical analysis of mechanical and geophysical identification parameters of velocity measurements collected from 1200 survey profiles located on 80% of the surface of the region. The visualization of geotechnical maps of bearing, consolidation, settlement, swelling of soils at any depth of Algiers region are obtained by manipulating the system technology produced as part of this research. These results are very helpful to builders, planners, researchers and engineers in their future work; they will help them making better decisions and producing safer and more economical designs. Furthermore, this research allows establishing the first geotechnical map of Algiers region