American Journal of Civil Engineering and Architecture
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  This is an Open Access Journal Open Access journal
     ISSN (Print) 2328-398X - ISSN (Online) 2328-3998
     Published by Science and Education Publishing Homepage  [19 journals]
  • A Comparison of AHP and PROMETHEE Family Decision Making Methods for
           Selection of Building Structural System

    • Authors: Vahid Balali; Banafsheh Zahraie, Abbas Roozbahani
      Pages: 149 - 159
      Abstract: Introduction of new structural systems into construction industry has created a competitive environment wherein selecting the most appropriate structural system has become increasingly difficult. Some structural systems have priority over others due to their unique features,as well as the special requirements of various construction projects. The structural system’s selection process is intended to show the trade-off among different alternatives when evaluated by technical and nontechnical professionals and maximize the agreement between all interested parties. This paper addresses how the best system can be selected using AHP and PROMETHEE family of multiple criteria decision-making techniques. These techniques have been utilized in this study for selecting the appropriate structural system among 3D Panel with light walls in building frames, LSF, ICF, Tunnel Formwork system, and Tronco in a low rise multi-housing project in Iran. A questionnaire has been designed to collect engineering judgments and experts’ opinions on various parameters such as weight of different criteria. The team of experts who has cooperated in this research includes engineers and managers of consultants, contractors, and owners who are involved in different low rise multi-housing projects in Iran. A comparison between the two techniques has been carried out based on the consistency of the results, the required amount of interactions with the decision-makers, and ease of understanding. For the case study of this research, 3D Panel with light walls in building frames has been selected as the most appropriate structural system. The PROMETHEE II has been selected as the preferred method for the appropriate structural system selection process since its results are consistent, easy to understand, and require less information from decision-makers compared to AHP.
      PubDate: 2014-09-08
      Issue No: Vol. 2, No. 5 (2014)
       
  • The Effect of sieved Coal Bottom Ash as a Sand Substitute on the
           Properties of Concrete with Percentage Variation in Cement

    • Authors: M. P. Kadam; Y. D. Patil
      Pages: 160 - 166
      Abstract: This paper presents the results of an experimental investigation on the effect of sieved coal bottom ash as a substitute for natural sand on the properties of concrete, when an extra 5%, 10%, 15%, 20%, 25% and 30% weight of cement was added. First, M-35 grade concrete was casted and tested; using a fixed percentage of 70% sieved coal bottom ash and 30% natural sand. The water cement ratio was maintained at 0.45. Then various tests including compressive strength, split tensile strength, flexural strength, density and water permeability were performed on the sieved coal bottom ash concrete. The results were compared with the control concrete and the percentage variations in strength were studied at 7, 28, 56 and 112 days. The results indicate a considerable increase in strength when 20% extra cement was added with the weight of cement.
      PubDate: 2014-09-11
      Issue No: Vol. 2, No. 5 (2014)
       
 
 
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