Iris Publishers Civil Engineering Open Access Journals

Iris Publishers - O pen Access Journal of Civil Engineering Prediction of Lateral Confinement Stress for Concrete Filled Steel Tube Column Structural columns that are made up of two or more different materials are known as composite columns. Studying composite structures is beneficial since it is a new and modern way to build structures and benefit from materials in a different way. Concrete- filled steel tubular structures makes the composite column a very stiff, more ductile, cost effective (as compared to reinforced concrete structures) and consequently a structurally efficient member in building and bridge constructions. In this study a numerical simulation of a circular composite column was conducted. In order to achieve the study objectives, Finite Element Method (FEM) based software (ABAQUS) was used due to many advantages including saving time of the calculation and providing a simulation of the behavior of the member. A load-deflection curve of a circular composite col...

Iris Publishers - Peer Review Open Access Journal of Civil Engineering Prediction of Compaction Parameters of Soil using Support Vector Regression Compaction parameters determination in the laboratory require considerable time and effort that can be saved by using empirical correlations at the early stages. This paper introduces some efforts to predict the compaction properties of soils using the index test results. Apart from the experimental result, the result from other literature have also been considered in the analysis here. Different statistical investigation such as histogram, ACF, PACF, kernel function, correlogram and cross correlogram are used to find the relationship of liquid limit, plastic limit and plasticity index with optimum moisture content and maximum dry density. Regression analyses are done with support vector machine algorithm. The best R squared value found from the predicted equation is 0.86 for optimum moisture content and 0.91 for maximum dry density...

Iris Publishers - Scholarly Open Access Journal of Civil Engineering Arable Land and Climate https://thewaternetwork.com/_/sustainable-agriculture/article-FfV/new-app-to-assess-agricultural-soil-and-improveits- quality-x5x4qMoKZeUB0j_qvtTInA  : The findings of the study indicate that bare soils, where no vegetation is allowed, except for crops, they are more prone to erosion by air and water, compaction and gradual deterioration. Such areas in the world are now about 11% of all land. Bare soils change the quality of water at the moments of its movement in the soil and after evaporation in the atmosphere. On such land, the natural function of water changes. Water changes its properties. Throughout the season, exposed soil, exposed to open solar heating, evaporates the moisture much faster. Evaporative intensification occurs after each natural and artificial irrigation. The path of its transformations is shortened, the variety of transformations disappears. The natural microf...

Iris Publishers - Open Access Journal of Civil Engineering The Cause of Formation and Characteristics of Algal Blooms in Channel-Type Reservoirs Algal blooms (ABs) in channel-type reservoirs present an increasing problem for ecosystem functioning and human health. This paper presents long-term data of the main eutrophic factors for a tributary of channel-type reservoirs (the Three Gorges Reservoir (TGR), China). The results indicate that all surface water was neutral and alkaline, had high nitrogen and phosphorus concentrations (0.59-27.74 mg/L and 0.005-3.444 mg/L respectively) and suitable air temperatures and water temperatures (19.5 - 40.0℃ and 8.0 - 31.0℃), which these factors can very easily induce ABs in the tributaries of channel-type reservoirs. An increasing number of ABs have been observed in the tributaries of backwater area, which have had several unique characteristics, such as the spatial “migration” of dominant algal species to other areas, the delay of the firs...