مقالههای B. Ahmadi
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: هفتمین کنگره ملی مهندسی عمران، سال ۱۳۹۲
تعداد صفحات: ۱۲
Reinforced Corrosion of concrete structures is a major problem in many countries particularly in hot and severe environments. It is well–documented that the major cause of deterioration of coastal reinforced concrete structures is the chloride–induced corrosion. Therefore, durability based design of concrete structures in marine areas has gained great significance in recent decades. In spite of comprehensive researches on the corrosion of reinforced concrete, there are still various controversial concepts. Effect of environmental conditions on durability of concrete structures is one of the most important issues. Hence, regional investigations are necessary for durability–based design and evaluation of the models proposed for service–life prediction.The Persian Gulf is one of the most aggressive regions of the world because of elevated temperature and humidity as well as high content of chloride ions in seawater. There are several mathematical models available that predict chloride ingress into concrete. In this work, two probabilistic service–life prediction models proposed by fib and an industry consortium and two other service–life models proposed by local research centers are studied and compared using chloride profiles obtained from marine RC structures located in the Persian Gulf region.<\div>
۲SIMULTANEOUS ANALYSIS, DESIGN AND OPTIMIZATION OF WATER DISTRIBUTION SYSTEMS USING SUPERVISED CHARGED SYSTEM SEARCH
اطلاعات انتشار: International Journal of Optimization in Civil Engineering، سوم،شماره۱، ۲۰۱۳، سال ۰
تعداد صفحات: ۱۹
The present study encompasses a new method to simultaneous analysis, design and optimization of Water Distribution Systems (WDSs). In this method, analysis procedure is carried out using Charged System Search (CSS) optimization algorithm. Besides design and cost optimization of WDSs are performed simultaneous with analysis process using a new objective function in order to satisfying the analysis criteria, design constraints and cost optimization. Comparison of achieved results clearly signifies the efficiency of the present method in reducing the WDSs construction cost and computational time of the analysis. These comparisons are made for three benchmark practical examples of WDSs.
اطلاعات انتشار: International Journal of Optimization in Civil Engineering، چهارم،شماره۲، ۲۰۱۴، سال ۰
تعداد صفحات: ۲۱
This paper describes the application of the recently developed metaheuristic algorithm for simultaneous analysis, design and optimization of Water Distribution Systems (WDSs). In this method, analysis is carried out using Colliding Bodies Optimization algorithm (CBO). The CBO is a population–based search approach that imitates nature’s ongoing search for better solutions. Also, design and cost optimization of WDSs are performed simultaneous with analysis process using a new objective function in order to satisfying the analysis criteria, design constraints and cost optimization. A number of practical examples of WDSs are selected to demonstrate the efficiency of the presented algorithm. Comparison of obtained results clearly signifies the efficiency of the CBO method in reducing the WDSs construction cost and computational time of the analysis.
۴Simultaneous analysis, design and optimization of structures using the force method and supervised charged system search algorithm
اطلاعات انتشار: Scientia Iranica، بيستم،شماره۱، ۲۰۱۳، سال ۰
تعداد صفحات: ۱۲
In this paper, the Charged System Search (CSS) algorithm and the force method are used for the simultaneous analysis and design of structures. Supervisor agents are introduced for the optimization procedure to enhance the exploration ability of the CSS. The presented method is applied to the design and analysis of some planer and space structures. A new formulation is presented for the objective function, and the accuracy and efficiency of the presented approach is examined by comparing the resulting design parameters and structural weight with those of other methods from literature.
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