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Civil Engineering Journal

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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 21 Documents

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Search results for , issue "Vol 4, No 6 (2018): June" : 21 Documents clear

Evaluating and Ranking of Travel Mode in Metropolitan; A Transportation Economic Approach Shafiei, Saeid; Vaelizadeh, Raeoof; Bertrand, Frederic; Ansari, Manouchehr
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Nowadays metropolitans' planners faced with a significant growth of private cars and consequently, creation a lot of environmental costs. To tackle the problem, the planners should find the best suitable way with due to the stakeholdersâ€™ views and other affected criteria to encourage the passengers for using the public transportation instead of their own cars. This paper has been performed to identifying and verifying main criteria affecting travel mode selection; getting different point of views; identifying the most effective travel mode from stakeholders' point of view and finally evaluating and ranking of travel modes in in Tehran metropolis. This study is a quantitative research based on survey and two structured questionnaires for passengers, experts and managers. In order to have an accurate data analysis, AHP as an MCDM models has been used to evaluate and ranking of travel modes. By identifying main criteria (variables) affecting travel mode selection, also collecting and analyzing stakeholdersâ€™ different points of views, the weight of each related criterion has been identified and determined and consequently the priority of effective travel mode in Tehran metropolis has been achieved. Finally, the managerial report has been prepared.

Public Evaluation of Speed Humps Performance and Effectiveness Sayed Shwaly; Amal AL-Ayaat; Mohamed Hamed Zakaria
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

In Egypt, it is believed that speed humps are the cheapest and best solutions to reduce vehicles speed and thus reduce the number of potential accidents. Due to the lack of specifications in Egypt that govern the installation of speed humps, they were spread randomly and with different dimensions without adequate studies. Consequently, this practice can cause adverse effects on the road users and the surrounding environment. For this purpose, a questionnaire was designed to discuss the different effects of using speed humps in Kafr El-Sheikh city as a typical model in the Egyptian cities. To verify that the questionnaire is appropriate for the intended task, it was evaluated by 30 respondents aged 18 years and over. After the trial process, the required corrections were made to the proposed form of the questionnaire. Then, final questionnaires were distributed and 1000 responses were collected from all road users, whether they were pedestrians, drivers, owners of vehicles or vehicle repairmen by using face-to-face interviews. The responses were analysed using SPSS program. The results reflected that the installation of speed humps contributed greatly to reduce vehicles speed, the flow of traffic and accidents rate. On the other hand, the results proved that humps also contribute significantly to the environmental pollution, damage to the pavement and vehicles especially when they are poorly designed and located. The majority of respondents attributed the random spread of the speed humps to the weakness of the authorities in law enforcement and the prevention of the installation of new humps without authorization. Finally, with the widespread use of speed humps and with the exception of the positive impact on traffic safety, it also has negative impacts on both the economy and the environment. Finally, the use of speed humps can cause many harmful effects to the neighbourhood, if there no strict control on its installation process. Unless specifications and some standards should be strictly followed, other means of traffic calming measures should be considered.

An Algorithm for Determining Optimum Link Traffic Volume Counts for Estimation of Origin-Destination Matrix Mehdi Mahmudabadi; Golam Ali Behzadi
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Travel demand information is one of the most important inputs in transportation planning. Today, the access to origin-destination (OD) matrix using traffic volume count information has caught the researchers’ attention because these methods can estimate OD matrices based on the flow volume in the links of network with a high accuracy at a much lower cost over a short time. In such algorithms, the number and location of links are one of the main parameters for traffic volume count; hence a better OD matrix can be achieved by choosing the optimum links. In this paper, an algorithm is presented to determine the number and location of optimum links for traffic volume count. The method specifies the minimum links to cover the maximum elements of OD matrix. This algorithm is especially useful for the estimation of ODM through gradient method, because only the O-D pairs covered by link traffic counts are adjusted and estimated in the gradient method. The algorithm is then scripted via EMME/2 and FoxPro and implemented for a large-scale real network (Mashhad). The results show that about 95% of the ODM can be covered and then adjusted by counting only 8% of the links in the network of Mashhad.

Effects of Aspect Ratio and Plate Thickness on the Behavior of Unstiffened Steel-Plate Shear Walls with Pinned and Rigid Connections Rahim Abdi; Nader Abdoli Yazdi
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Unstiffened steel plate shear walls (SPSWs) have been in use mostly in recent years. In this numerical study, the buckling behavior of a single-storey single-bay unstiffened SPSW with two pinned and rigid beam-column connections under lateral loading is investigated. The SPSW had different wall aspect ratios (L/h=1, 1.5, 2, 2.5, and 3) and infill plate thicknesses (tw= 3, 5, and 7 mm). Their effect on the buckling behavior of SPSW was examined using buckling analysis in ABAQUS software. Results indicated that with the increase of infill plate thickness, the lateral resistance of unstiffened SPSW system increases, but by increasing wall aspect ratio, its resistance decreases. In both connection designs, the model with L/h=1 (square-shaped model) showed better ductility and higher stiffness and strength in all three thicknesses. Maximum shear stress responses of SPSW models showed that in pinned design with L/h=1, the most change in shear stress values was 8% when infill plate thickness reached from 5 to 7 mm; while for rigid connection, it was reported as 7% when it increased from 3 to 5 mm. This indicates that in rigid connection, increasing the infill plate thickness has less effect on the increase of lateral resistance. By examining the performance of rigid and pinned beam-to-column connections with different wall aspect ratio and infill plate thickness, it was found out that maximum shear stress in rigid connection increased by 11% compared to pin connection. It was concluded that an optimum unstiffened SPSW model had a wall aspect ratio of 1 and infill plate thickness of 7 mm.

A Game Theory Approach for Conjunctive Use Optimization Model Based on Virtual Water Concept Sedghamiz, Abbas; Heidarpour, Manouchehr; Nikoo, Mohammad Reza; Eslamian, Saeed
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

In this study to allocate the agricultural and environmental water, considering virtual water concept, a multi-objective optimization model based on NSGA-II is developed. The objectives consist of equity maximization, agricultural benefit maximization for each region, maximization of green water utilization and finally minimization of environmental shortage. Then a cooperative game (Grand Coalition) model is presented by forming all possible coalitions. By the game model including Nucleolus, Proportional Nucleolus, Normal Nucleolus and Shapley methods, the benefit is reallocated based on all Pareto optimal solutions obtained from multi-objective optimization model. Then using two famous fallback bargaining methods, Unanimity and q-Approval, preferable alternative (solution) for each of the cooperative games is determined. Finally, based on the obtained benefit for each selected alternatives, the two most beneficial alternatives are chosen. The proposed methodology applied for water allocation of Minoo-Dasht, Azad-Shahr and Gonbad-Kavoos cities in Golestan province, Iran for a 3-year period as a case study. Also, eight crops including Wheat, Alfalfa, Barley, Bean, Rice, Corn, Soya, and Cotton are selected based on local expertsâ recommendations. The modelsâ results indicated no significant difference between the grand coalition model and the multi-objective optimization model in terms of the average cultivation area (a relative change of 2.1%), while lower agricultural water allocation occurred for the grand coalition model (about 10.35 percent average) compared with the multi-objective optimization model. It is also observed that more agricultural benefit gained by the grand coalition model (32 percent average). Finally, it is found that Wheat and Corn hold the most rates of import and export, respectively, and Rice was the crop which has the least shortage of production to supply food demand.

A Numerical Investigation on Behavior of Column Base Plates with Different Configurations Shafieifar, Mohamadreza; Khonsari, Vahid
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Base plates are one of the most important types of connections in structures. Due to complicated steel-concrete interaction, simple assumptions of the stress distributions are usually employed for designing the connection. Simple assumptions of compressive stress distribution in concrete may accelerate the design procedure, but they may lead to overdesign results. In this study, six different types of base plates with different configuration were studied numerically using a commercial Finite Element (FE) software and the numerical model was calibrated with an experimental test. The models were subjected to a constant axial load and then a monotonic moment loading was applied. To investigate the effects of the axial load, several axial load level were considered for each configuration. As a result, moment-rotation curves of these base plates, including their rotational stiffness, in the absence and presence of the axial loads, were compared. Moreover, the stress distribution in the concrete was studied in the FE models. For all cases, the stress distribution in the concrete was semi-triangular with the maximum stress between the column flange and the edge of the plate. Based on numerical results, some concepts of simplified assumptions were proposed to find the stress distribution of the base plates. These assumptions are more realistic than current assumptions in structural specifications.

Effects of Near Fault and Far Fault Ground Motions on Nonlinear Dynamic Response and Seismic Improvement of Bridges Hajali, Mohammad; Jalali, Abdolrahim; Maleki, Ahmad
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

In this study, the dynamic response of bridges to earthquakes near and far from the fault has been investigated. With respect to available data and showing the effects of key factors and variables, we have examined the bridgeâs performance. Modeling a two-span concrete bridge in CSI Bridge software and ability of this bridge under strong ground motion to near and far from fault has been investigated. Nonlinear dynamic analysis of time history includes seven records of past earthquakes on models and it was observed that the amount of displacement in the near faults is much greater than the distances far from faults. Bridges designed by seismic separators provide an acceptable response to a far from fault. This means that in bridges using seismic separators, compared to bridges without seismic separators, Acceleration rate on deck, base shearingÂ and the relative displacement of the deck are decrease. This issue is not seen in the response of the bridges to the near faults. By investigating earthquakes near faults, it was observed that near-fault earthquakes exhibit more displacements than faults that are far from faults. These conditions can make seismic separators critical, so to prevent this conditions FDGM should be used to correct the response of these bridges. Based on these results, it can be said that the displacement near faults with forward directivity ground motion is greater than far from faults. So that by reducing the distance from the faults, the maximum value of the shearing and displacement of the deck will be greater.

Rural Tourism Entrepreneurship Survey with Emphasis on Eco-museum Concept Mojgan Ghorbanzadeh
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Unemployment and scarcity of job opportunities count as major problems suffered in villages, especially by the youth. To this end, rural entrepreneurship, particularly in tourism and ecotourism sector, may contribute to the growth of rural economy through strategic and forward-looking planning along with other factors. Innovation and creativity are turning into one of the essential ingredients of continued development. Rural museums, such as “Eco-museum”, are one of the measures taken with regard to protecting various material and spiritual phenomena resulting from traditional habitats. “Eco-museums” can be deemed as a project to support sustainability, and a significant factor for development of entrepreneurship and businesses, especially small- and medium-sized businesses. Espidan, a village in North Khorasan province of Iran, can exert such an effect and play such a role as an eco-museum. Through library resources and field studies, the present study attempts to examine the potentials of Espidan for strengthening its rural tourist properties and fulfilment of ecotouristic objectives in line with three main criteria: public contribution, exclusive eco-museum activities, and creating social, cultural and natural conditions (the determining the vital conditions for a place to evolve into an eco-museum). A study and evaluation of the recommended criteria in Espidan indicates that the village demonstrates considerable potentials for evolving into an eco-museum. As effective steps towards achieving continued development, practical solutions have been proposed for fulfilment of eco-museum objectives as such an evolution into an eco-museum can result in rural entrepreneurship.

Design and Performance of a Single Axis Shake Table and a Laminar Soil Container Alaie, Reza; Jamshidi Chenari, Reza
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Correct evaluation of shear modulus and damping characteristics in soils under dynamic loading is one of the most important topics in geotechnical engineering. Shaking tables are used for physical modelling in earthquake geotechnical engineering and is key to the fundamental understanding and practical application of soil behaviour. The shaking table test is realistic and clear when the response of geotechnical problems such as liquefaction, post-earthquake settlement, foundation response and soil-structure interaction and lateral earth pressure problems, during an earthquake is discussed. This paper describes various components of the uniaxial shaking table at university of Guilan, Iran. Also, the construction of the laminar shear box is described. A laminar shear box is a flexible container that can be placed on a shaking table to simulate vertical shear-wave propagation during earthquakes through a soil layer of finite thickness. Typical model tests on sandy soil conducted on the shaking table and the results obtained are also presented. Appropriate evaluation of shear modulus and damping characteristics of soils subjected to dynamic loading is key to accurate seismic response analysis and soil modelling programs. The estimated modulus reduction and damping ratio were compared to with Seed and Idrissâs benchmark curves.

Reduced Beam Section (RBS) Moment Connections-Analytical Investigation Using Finite Element Method Sofias, Christos; Tzourmakliotou, Dimitra
Civil Engineering Journal Vol 4, No 6 (2018): June
Publisher : Salehan Institute of Higher Education

Reduced Beam Section (RBS) moment resisting connections are among the most economical and practical rigid steel connections developed in the aftermath of the 1994 Northridge and the 1995 Kobe earthquakes. Although the RBS connection effectiveness was widely investigated using US design and construction practices, only limited data exist from European research. Recommendations of RBS applications in steel frames were prescribed in EC8, Part3. However the reliability of these recommendations is under consideration due to above mentioned poor existing data. This paper examines numerous different contours of radius cut-out (Group A) and provides recommendations for the design and detailing of radius cut Reduced Beam Section (RBS) moment connections.Â Furthermore, it examines and compares different beam cross sections of European steel profiles (Group B) while the sizing of the RBS cut is kept at a constant ratio. Analytical approach was conducted investigating the adopted by EC8, Part 3 key parameters for the design. The main objective of the applied RBS geometry is to protect the connection and its components (endplate, column flange, bolts, welds) from either plastification or failure. Although the computational cost for optimization with ABAQUS is very large, the results of this study ensures on one hand that the performances of the structural parts can be effectively improved by shape optimization and an the other hand that adjustment in the geometry of the radius cut is needed for safe application to European profiles.

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