حسنعلی مسلمان یزدی

Nowadays, engineering solutions, that guarantee the safety of residents and at the same time pay attention to economic concerns, are proposed in structural engineering.structural Researchers have investigated connections with smaller cross-section in metal structures, demonstrating satisfactory performance in steel bending frames under various cyclic loads. A significant shortcoming of previous research has been the insufficient focus on cost-effectiveness. In addition, many studies have predominantly concentrated on specific types of connections or relied heavily on trial-and-error methods instead of optimizing the dimensions of these connections. This study presents the analysis and optimization of various joint types. Specifically, Reduced Beam Section (RBS) joints were modeled using ABAQUS software through dynamic analysis and numerical methods. The outputs from these analyses were then processed using a genetic algorithm (GA) in MATLAB. The optimal data generated by the GA served as suitable input for neural network modeling, facilitating design refinements. Utilizing two neural networks, the optimal length and cross-section of RBS connections were determined, resulting in more accurate design outcomes, enhanced design efficiency, reduced project execution time, and ultimately, cost savings.

The most important indicator of a project’s success is not only it should be cost-effective, but also it should be ended on the predicted time. In some projects like constructing subways, dams and so on, delay in construction causes big problems in financial, social or political levels in the countries. To reduce or eliminate delays in construction projects, time optimization should be planned. The main goal of this project is to study the time delay in construction of Karaj subway. In this regard the reasons are recognized and evaluated. In the first step, by reviewing project documents and designing a questionnaire which was completed by a set of experts, factors of delay in constructing Karaj subway were recognized. In the next step, by using multi-criteria decision-making methods, these factors were phased out, weighted and prioritized. At the end, by using Fuzzy logic and to estimate the delay of projects, a method was provided that according to it the project manager can use experts’ ideas and recognizes how much this project has progress and do necessary actions to have a more rapid exploitation.

Human beings have been always facing natural disasters such as floods, storms, earthquakes, etc. from the beginning and have tried to manage and control these disasters. Problems caused by earthquake and other natural disasters for lifeline structures may result to the lack of potable water. Therefore, use of emergency water supplies is inevitable and vital after these disasters and water is the most basic needs for people in such a critical situation.
Maintaining safe water after damages to lifeline structures is a top priority of water and wastewater companies. Regarding the recent researches, one of the methods for water supply in emergency situation is the use of fixed tanks in volumes from 20 to 100 cubic meters that have been installed in suitable points of the city. Choosing the most suitable layout for the location of the tanks is very important because of their cost and required time for construction and installation.
In this study, the library method is applied to collect information about the research topic. Then, by conducting interviews, a questionnaire is designed to get the experts’ idea about the location of the emergency tanks. Consequently, the most important criteria and factor regarding each criterion are determined. Finally, the weight of importance factor of each criterion is calculated by Analytical Hierarchy Process (AHP), which is a multi-criteria decision-making method.
Findings: Five main criteria are chosen for locating the emergency tanks, which are as follows (according to their weights): Closeness to centers with higher degree of importance, Closeness to more crowded centers, Preservation of hydraulic conditions of water distribution networks, reachability, and acquisition cost of location.
In order to find a proper location for tank installation, various locations such as parks, mosques, and schools, can be compared with considering the obtained criteria and their weights, to prioritize the locations and find the best option by using the AHP method. Closeness to centers with high degrees of importance is most prior criterion while the acquisition cost is the least priority.