Browsing by Author "TAFIDA, Abba Kabir"
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Item OVERALL COST OPTIMIZATION OF A CONCRETE BRIDGE USING SIMULATED ANNEALING ALGORITHM(2014-10-07) TAFIDA, Abba Kabir; AKIŞ, Tolga; DENGİZ, OrhanCost of construction is one of the critical success factors for construction project, which have gone up to a level that there is need to reduce its effect in construction projects. Overall construction cost minimization helps to reduce the high cost of construction in concrete bridge constructions. In order to minimize the construction cost, there is need to develop a decision support tool that is capable of selecting appropriate span length, number of spans, girder type, number of girders, pier sizes, number of piers, footing sizes and estimate their total cost including all other bridge elements. The purpose of this study is to determine the overall optimum cost of bridge, optimum span length, optimum number of span and a prototype bridge cost optimization decision support system, which is applicable to bridge construction projects. The proposed overall cost optimization decision support system can analyze different span lengths and different precast I-girder type alternatives in order to realize optimum cost of the bridge construction project. A cost optimization process model has been developed and coded in MATLAB computer program to perform the design and estimate the overall optimum cost of the bridge. The considered bridge superstructure is supported by precast I-girders resting on pier cap and the substructure is constituted by multicolumn piers and rectangular spread footings. Standard AASHTO precast I-girder types are used in this study and the piers and footings are designed by using allowable stress design method. Minimum depth of super structure, I-girder type, maximum span length, spacing and overhang width constraints are considered. A simulated annealing algorithm is used for the optimum design of the bridge and overall construction cost is taken as the optimality criteria.