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Civil Engineering Journal

cej
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Published by C.E.J Publishing Group

ISSN : 24763055 EISSN : 24763055 DOI : -

Core Subject : Engineering,

Civil Engineering, Building, Construction & Architecture

Civil Engineering Journal is a multidisciplinary, an open-access, internationally double-blind peer -reviewed journal concerned with all aspects of civil engineering, which include but are not necessarily restricted to: Building Materials and Structures, Coastal and Harbor Engineering, Constructions Technology, Constructions Management, Road and Bridge Engineering, Renovation of Buildings, Earthquake Engineering, Environmental Engineering, Geotechnical Engineering, Highway Engineering, Hydraulic and Hydraulic Structures, Structural Engineering, Surveying and Geo-Spatial Engineering, Transportation Engineering, Tunnel Engineering, Urban Engineering and Economy, Water Resources Engineering, Urban Drainage.

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Articles 1,848 Documents

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A Circular Framework for Evaluating Highway Construction Projects Success: AHP Approach Ahmed Yousry Akal; Ahmed Ebrahim Abu El-Maaty; Saad Abdel-Karim El-Hamrawy
Civil Engineering Journal Vol 2, No 7 (2016): July
Publisher : Salehan Institute of Higher Education

Success has always been the ultimate goal of every activity, and a construction project is no exception. There are few topics in the field of project management that are so frequently discussed and yet so rarely agreed upon as that the notion of project success criteria. Usually much of the national budget on infrastructure development is channelled to highway construction projects. However, no official studies have been presented before to evaluate the performance this industry in Egypt. Consequently, this reflects the importance of this study which aims at laying out a standard framework which identifies the criteria for measuring projects success. The identified criteria, in turn, can be used as a tool to help the stakeholders of the highway projects in Egypt in judging the project performance and success during the project's post-construction phase. Using a detailed literature review thirteen success measures are identified (four objectives and nine subjective). Furthermore, the analytic hierarchy process (AHP) is adopted to prioritize the identified measures based on accumulative knowledge of academic experts in highways construction industry through the application of questionnaire survey. The study establishes that project completed on time, project completed within budget, health, safety and number of accidents, profitability and quality in construction are the most significant measures used for assessing the highway projects performance and success.

Redefining Existing Concrete Compressive Strength Acceptance Standard in Iran Concrete Code (ABA), by Experimental Data Iman Mohammadi Bidsardareh; Mohammad Mohammadi
Civil Engineering Journal Vol 4, No 5 (2018): May
Publisher : Salehan Institute of Higher Education

In Iran Concrete Code (ABA), the criteria for calculation of standard deviation (s) are comprehensive and holistic. However, if it would be determined separately for each geographical area, significant changes could occur due to the use of concrete as one of the common materials. This paper analyses the criteria and redefines the acceptance standards for concrete compressive strength in ABA using experimental data available in Kohgiluyeh and Boyer-Ahmad and Fars provinces. The main hypothesis of the study is that using the statistical analysis of the test specimens for three categories C21, C30 and C35 in various projects located in Kohgiluyeh and Boyer-Ahmad and Fars provinces, extracting standard deviations, mean and the compressive strength of the specimens and their comparison with ABA proposed relationships and values, it is possible to propose new amendments for these areas in line with economic savings in national and international projects. In this study using the quantitative Strategy, library - Internet studies, field studies and in cooperation with the concrete labs, required information for 4878 concrete specimens was collected from the above-mentioned areas. By analysing the acceptance regulations for the specimens based on ABA and comparing the standard deviation of these data with the formulas of the regulations, significant results were obtained for the standard deviation factor correction and finally some formulas were suggested for the acceptance of the concrete specimens.

Numerical Investigation of Inverse Curvature Ogee Spillway Rasoul Daneshfaraz; Amir Ghaderi
Civil Engineering Journal Vol 3, No 11 (2017): November
Publisher : Salehan Institute of Higher Education

Design of water structures and their segments including spillways play an important role in water resources management and agricultural activities. In the the linear body part of an ogee spillway, for speeding up the flow rate, the flow should be transferred to the stilling basin by inverse curve so that the water energy can be reduced. This study aims to evaluate the effect of the inverse profile curvature on the pressure of spillway surface using Fluent software. For this purpose, five different curvatures of inverse profile were considered to be equal to no-curvature (zero), 1, 1.5, 2 and 2.5 of the spillway design head. The results indicated that by increasing the curvature radius, the maximum pressure dramatically reduced. And for this purpose, some relationships were given to predict the pressure reduction. Pressure increment in zero curvature is caused by sudden collision of flow lines and turbulence caused by it. By increase in inverse profile curvature, the turbulence is created in flow lines and the maximum pressure shows a lower value than before. In general, there was little change in the average absolute pressure.

Investigation of Ready Mixed Concrete Transportation Problem Using Linear Programming and Genetic Algorithm Gulcag Albayrak; Ugur Albayrak
Civil Engineering Journal Vol 2, No 10 (2016): October
Publisher : Salehan Institute of Higher Education

Ready-mixed concrete (RMC) is one of the most common building material for construction industry for nearly all developed and developing countries. Generally, because of the technical requirements, concrete must be mixed in a batch plant and transported to the construction site. There are two important factors affected the cost of RMC: raw material cost and transportation cost. Additionally, transportation cost is also included when determining the unit price of RMC. However, profitability affects adversely in the case of long distance between the plant and construction site. For these reason, distribution of RMC from supply to the demand points with minimum cost is aimed in this study. This work contributes to both modelling and dispatching of RMC as an optimization problem by applying linear and heuristic methods. For this purpose, as an example, an urban area which divided into 7 districts and contained 4 concrete batch plants is discussed. Linear programming and genetic algorithm were applied to solve this problem and compared each other under the same conditions. The result shows linear programming is more efficient for this application because of the limited constraints and variables.

An Innovative Method for Estimating the Spatial Distribution of Parking Demand in Different Areas Nafiseh Hosseini; Ali Khoshgard
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Parking facilities in the urban road network are of the most essential parts of the transportation and traffic system. Considering that many users are not interested in parking in or near the destination zone, or in some cases it is not basically possible to park in this area, the parking demand in each area is not merely associated with the actual land use of that area and is sometimes affected by the land use of the surrounding area. Therefore, estimating the spatial distribution of parking demand is essential to accurately determine the real parking demand, especially in non-marginal urban areas. In conventional methods of estimating the parking demand in each area, it is assumed that the parking areas are located in the same area or distributed uniformly in the surrounding areas, without considering the desirability of the surrounding areas, which has sometimes led to unrealistic estimations. Accordingly, new methods, capable of estimating the real parking demand in each area, are needed. In present study, an innovative method is proposed to predict the spatial distribution of parking demand and then it is applied to the central area of Tehran.

Calculation of the Spatial Flooding Intensity with Unit Flood Response Method in the Tangrah Watershed, Iran Masoumeh Gharib; Baharak Motamedvaziri; Bagher Ghermezcheshmeh; Hasan Ahmadi
Civil Engineering Journal Vol 3, No 12 (2017): December
Publisher : Salehan Institute of Higher Education

Increased flooding in recent years indicates that most parts of the country are subjected to periodic and destructive flood attacks. Therefore, the identification of high-risk areas with potential runoff production within a watershed area is one of the most important measures in flood control and reduction of the damage caused by it. In this study, the quasi-distributional ModClark method was employed to simulate the hydrograph of flooding, and the unit flood response method was applied to determine the intensity of flooding of different areas of the Tangrah watershed, Iran. For this purpose, the ModClark model was first calibrated and verified. Thereafter, the design of rainfall with 50 and 100-year return periods ( ) was extracted at the Tangrah station and the design flood was calculated with the above-mentioned return periods. By combining the curve number layers, slope, precipitation, and flow distance, homogeneous units were obtained in terms of the flood. The effect of each homogeneous unit on the total watershed output was obtained by the removal of each unit and implementation of the rainfall-runoff model. According to the 100-year return runoff production potential, homogeneous units of 116 with a fi (0.54 m3/ s. km2) were identified as the most effective cell in the Tangrah watershed area, which could be explained by the soil type, vegetation, and other physical factors of these units.

BIM for Facility Management: Challenges and Research Gaps S. Neda Naghshbandi
Civil Engineering Journal Vol 2, No 12 (2016): December
Publisher : Salehan Institute of Higher Education

This writing presents research gaps in the area of Building Information Modelling (BIM) in Facility Management (FM) industry, and identifies practical challenges that facility management professionals are facing in utilizing BIM. Although this issue, BIM for Facility Management, has gained attention both in literature and practice, and it is highly demanded in FM industry, still it is far away from effective implementation. It is not clear for facility manager whether BIM is helpful to accelerate the process or it is a cost effective solution, and what skills are required for them. The key for effective BIM implementation in FM industry is to enhance collaboration among different parties in project lifecycle. However, still there is a doubt about the importance of FM in Construction industry. In other words, construction does not understand FM. Furthermore, there are issues over interoperability and data exchange. Thus, to assist BIM implementation, it is required to prove the correctness of benefits, uses, and challenges identified in the literature. This paper uses an intensive literature review and highlights the potential research issues in terms of BIM for FM to assist effective implementation of BIM in facility management phase of projects.

Determination of Resistance to Creep Permanent Deformation of Hot Mix Asphalts Prepared with Various Additives Erkut Yalçın; Muhammed Ertuğrul Çeloğlu; Mehmet Yılmaz; Baha Vural Kök; Taner Alataş
Civil Engineering Journal Vol 4, No 7 (2018): July
Publisher : Salehan Institute of Higher Education

In this study, the resistance of hot mix asphalts containing different additives to the creep permanent deformation was investigated by the dynamic creep test. Four different additives were used in the study. Styrene-butadiene-styrene (SBS), American Gilsonite (AG), and Iranian Gilsonite (IG) were used for modifying the bitumen. Additionally, the same mixtures were prepared by using 2% hydrated lime as filler. The samples were subjected to dynamic creep test at 50°C under 500 kPa stress level. As a result of the tests performed, it has been determined that all of the additives used in the study improve the resistance to the creep permanent deformation. It has also been determined that the use of bitumen additives is more effective than the use of lime. Furthermore, it has been determined that the most effective additive is IG while the least effective additive is SBS, and hydrated lime use is more effective compared to the mixtures prepared with a neat binder.

Stability Analysis and Support Design of Imam Reza Tunnel in Ardabil Sarcham Road by Numerical Methods Alireza Afradi; Siamak Rezazadeh
Civil Engineering Journal Vol 4, No 1 (2018): January
Publisher : Salehan Institute of Higher Education

Geological structures and performance of the geodynamic processes can affect engineering projects on their own. Hence, the stability analysis and designing methods for foreseeing the retaining and support system for tunnels are diverse and came from different points of view. So this study seeks to present stability analysis of Imam Reza tunnel in Ardabil Sarcham Road with a special focus on the impact of future earthquakes on its stability using numerical methods. In this study, first designing and operating the initial structure with the height of 5.5 m and a semi-circular cross section. Secondly, drilling with the height of 3m and the width of 7.34 m and with a rectangle cross section. For stabilization, Rock Mass Rating (RMR) geomechanical classification systems and methods used. At the stabilization level, the materials were examined in laboratory, regarding the properties of sides and roof of the tunnel and pressure on them. The results of physical and mechanical experiments shown that the compressive strength ranged from 400 kg/cm2 to 500 kg/cm2 on average. The elastic modulus is between 12 and 13 GPa for the rocks. The Cohesion (C) ranged from 4-5MPa to 5 MPa and the Angle of Internal Friction (φ) is between 60ᵒ and 50ᵒ.

Effects of Soil Modulus and Flexural Rigidity on Structural Analysis of Water Intake Basins Hassan Akbari
Civil Engineering Journal Vol 3, No 3 (2017): March
Publisher : Salehan Institute of Higher Education

A water intake basin is a buried box that functions as a water reservoir near shorelines. Number of these structures has been increased in the recent years and for a safe design, it is necessary to know their behaviour under applied loads. In addition to common dead, live and seismic loads, the bottom of such a basin is usually located below sea water level and endures uplift pressure as well as reaction of supporting soils. Uncertainty of these special loads complicates the structural response of this buried basin to the applied loads. Therefore, the unreliability in the soil parameter and in the rigidity of the basin structure is studied in this research by calculating the generated internal bending moments. Different loads and load combinations have been taken into account and finite element analysis is carried out for modelling nonlinear behaviour of different types of supporting soils. It is concluded that the geometry and flexural stiffness of the basin affects the analysis more than the soil parameters because the contribution of the soil modulus in the total stiffness of the system is negligible than the structural rigidity of the basin structure. In addition, inner walls and geometry of the basin should be modelled in detail to obtain acceptable results.

Page 32 of 185 | Total Record : 1848

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