THE COMPRESSION BEHAVIOUR OF CONCRETE FILLED STEEL TUBE COLUMNS: EXPERIMENTAL AND NUMERICAL INVESTIGATION
Published In: 3RD INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): A.S. SHAKIR , A.S. SHAKIR , S.W. JONES
Abstract: The use of Concrete Filled Steel Tube columns becomes increasingly popular in the structural engineering field due to the advantages such as high bearing capacity, ductility and economic efficiency. Many experimental and numerical studies have been undertaken to investigate the behaviour of normal aggregate concrete filled steel tube NACFST columns under quasi static loads. However, few research has been conducted to study the behaviour of the recycled aggregate concrete filled steel tube RACFST columns under compression loading particularly the eccentric loading. This paper reports the findings of the experimental and numerical study investigating the behaviour of the NACFST and RACFST columns subjected to axial concentric and eccentric loading. Eighteen structural circular hollow tubes with a length of 458 mm and an outer diameter (D) of 114.3 mm were tested; half of them were filled with recycled aggregate concrete while the others were filled with normal aggregate concrete. The stu
- Publication Date: 27-May-2015
- DOI: 10.15224/978-1-63248-062-0-66
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APPLICATION OF AHP FOR THE CRITERIA EVALUATION OF A PUBLIC PROCUREMENT IN COLOMBIA
Published In: 3RD INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): EUGENIO PELLICER , JOSE AGUSTIN VALLEJO BORDA , JOSE LUIS PONZ-TIENDA , LAURA ANDREA GUTIERREZ BUCHELI
Abstract: In order to conduct a verification of the methodologies used by the Ministry of Education of Colombia in the selection of contractors, a process of selection of bidders through Analytic Hierarchy Process (AHP) was replicated. From the theoretical development of AHP as a tool for decision making, this paper presents the application of the method in public procurement through a case study in which the similarities and differences were compared with the actual outcome of the process. Among the main characteristics generally found that the classification given by the traditional process has a level of identity of 67% compared to the result obtained by the application of AHP. In addition to this, we found that at the point of no coincidence between process and AHP, the contractor had lower levels of performance compared to other contractors. These results are the base to initiate a search for new methods and selection criteria of proponents focusing on getting the contractor that better mee
- Publication Date: 27-May-2015
- DOI: 10.15224/978-1-63248-062-0-67
- Views: 0
- Downloads: 0