جستجوی مقالات مرتبط با کلیدواژه « پروژه های عمرانی » در نشریات گروه « عمران »

The COVID-19 pandemic has caused numerous damages and challenges in the construction industry, in addition to taking a significant number of human lives and imposing heavy costs in the healthcare sector. These damages and challenges have undoubtedly resulted in extensive economic and social consequences for countries worldwide. Therefore, examining these challenges and providing appropriate solutions during times of crisis and widespread virus transmission is of utmost importance. In this research, a list of damages and challenges associated with COVID-19's spread on active construction projects was first compiled through library studies. Then, using a Likert-scale questionnaire, the opinions of project management experts in Kerman city were collected and analyzed in the SPSS software. The triangular fuzzy number comparison matrix was completed and the prioritization of indicators and sub-indicators was performed using the Super Decision software. Finally, the decision matrix was formed based on the multi-criteria TOPSIS fuzzy method using the criteria of "impact level," "importance degree," and "preventability of damage." The identified damages were ranked using the relevant questionnaire, and ultimately, risk management solutions were provided through appropriate responses. Based on the research findings, damages related to "financial challenges," "health challenges," "work and organizational challenges," and "time and scheduling challenges" had the most significant impact on active construction projects, respectively.

Every year, a significant portion of the country's credits and financial resources are allocated to investment in civil and infrastructural projects. Risk management can prevent cost escalation and assist in completing projects within the designated time and budget. This study aims to identify factors contributing to the lack of implementation of risk management in small-scale civil projects in the city of Abadan. The research utilizes a descriptive method for data collection and employs exploratory factor analysis and TOPSIS analytical methods to identify and prioritize the factors. The results indicate that the influential factors in the lack of implementing risk management include four main elements (technical risk barriers, project management and leadership obstacles, construction risk barriers, financial risk barriers), among which the option of insufficient knowledge of the contractor has priority over other options.

This article provides a comprehensive review of project planning and elucidates its pivotal role in ensuring success in the complex landscape of civil engineering projects. From various perspectives, the emphasis is placed on the sequential progress of projects, precise planning, resource coordination, meticulous control, and the adoption of innovative planning methods as essential components. The consequences of neglecting these fundamental stages, with a focus on cost, time, and project quality factors, are examined. Consequently, the synthesis of these perspectives underscores the linchpin role of planning in construction projects. Sequential progress, coupled with strategic planning and precise control, emerges as a foundational principle. Decision-making based on data and the utilization of mature models enhance project management efficiency. Serving as a comprehensive guide, this article underscores the significance of planning stages as the axis of success in civil engineering projects. With a comprehensive approach, recognition of interdisciplinary nature, and laying the groundwork for informed and strategic decision-making in the dynamic landscape, the article supports the outlook of effective project management in civil engineering.

The delay in the implementation of urban train projects causes significant costs such as "opportunity cost", "depreciation of the construction period" and "end of contract guarantee period and equipment warranty before the start of operation". The main goal of this research is to investigate the factors affecting the increase in the cost and time of construction of an urban train line in Tabriz. For this purpose, a non-random statistical sample of 24 experts was selected. Data collection was done through conducting interviews and distributing questionnaires among them. After checking the validity and reliability of the research, Shannon's entropy method was used to analyze the research findings. The results of the research show that the costs of implementing the project of one urban train line in Tabriz have increased by 435% (in constant price) compared to the initial estimate, and the duration of the project has reached more than 21 years instead of 7 years. In other words, the real cost of each kilometer of a Tabriz city train line was 14270 billion Rials at the price of 1400. Also, the results of the research indicate that the most important factors affecting the increase in the time and cost of the implementation of the Tabriz urban train line project are: the lack of realistic forecasting of costs at the beginning of the project, the failure to pay credits on time, the delay in providing land from the municipality, problems caused by the performance of the employer and consultants and contractors and equipment suppliers, differences in the urban management complex and problems caused by sanctions.

In many organizations, the selection of the project portfolio and activities related to the management of selected projects during their life cycle is one of the most important activities of the organization. Due to the financial and physical constraints of the projects, there are always many projects waiting to be implemented. Therefore, the selection of projects should be such that a project portfolio is selected and formed in an optimal time horizon for proper management. Regarding the position and nature of public-private partnership agreements in Iran, ten projects with public-private partnership agreements have been selected by given the objective function to maximize the net present value of the projects by simultaneously considering two factors of reinvestment strategy and time value of capital. Input data were entered into Excel software using formulas related to public-private partnership contract to specify economic parameters, complete the data and also prepare them. Then, the model is coded in Lingo software and executed to find the research results. This model has an objective function that shows the maximum net present value of projects selected as a case study of portfolio management based on specific start times. The results of this study are obtained in two cases, according to the amount of the objective function in the case with considering the reinvestment strategy and the time value of capital with the optimal time horizon obtained in this research for eleven years, compared to the value of the objective function with the same conditions, for the assumed 20-year time horizon, 257.59 billion rials have been saved in construction costs and also one year has been reduced from the completion of the construction of the project portfolio.

Reduction in project implementations is one of the most important challenges in construction management. In our country, after the revolution, there has been a significant leap forward in the construction of national civilization projects. However, despite the increase in the number of projects being implemented or commissioned, the problem facing these types of projects is the lack of start-ups and their operation on time according to the schedule. These delays also increase the cost of construction and reduce their quality. Comprehensive Quality Management (TQM) is the process by which management, with the participation of employees, customers and creditors, continuously improves quality. In other words, the final product in any industry must be tailored to the standards required by that industry to bring customer satisfaction. The construction industry is not an exception to this rule, and even the high cost of construction in this industry makes it necessary to ensure the control of the final product more than other industries. On the other hand, one of the goals and perspectives of TQM is to satisfy the customer completely with the least cost and attention to the optimal point of life cycle costs. In some cases, it increases so much that it takes the plan out of the being economic. In this article, while defining the basic topics of management, it deals with the role and position of time management, in the occurrence of delays and providing appropriate solutions to solve them. The aim of this study was to investigate the effect of quality management on optimal changes in construction costs for the construction projects.

Value engineering is one of the most important and effective items in the field of cost and time optimization in construction projects and industries such as oil and gas. As in developing countries such as Iran, which also face limited equipment and resources, this issue and cost and time management have become essential. It is worth noting that in some projects, due to obstacles, value engineering is not done. In some projects, despite doing so, issues such as cost increases are encountered at the time of implementation, part of which is due to improper implementation of value engineering. In line with the above, in this study, using semi-structured interviews, value engineering factors in the field of benefits, obstacles, solutions, and promotion have been identified. The obtained reliability and Cronbach's alpha have been calculated equal to 0.834. The Kolmogorov-Smirnov test was also used to normalize the data, and the Friedman test was used to rank the data. The results obtained in the field of value engineering benefits, elimination of unnecessary functions and upgrading of construction projects, and improvement of executive plans have the highest score. In the field of value engineering obstacles, resistance to change due to its risks and lack of awareness of brokers and culture, the most important factors and in the field of effective solutions to upgrading value engineering, the level of management support for value engineering proposals and performance and the use of specialized consultants, have the highest score and impact from the statistical community and a case study in engineering and development gas company of Iran in order to identification and classification of existing benefits and obstacles of implementation of value engineering upgrades in civil projects.

Purpose of this study is Assessment and review of time - lag factors in a Bridge. The execution of development projects such as bridges, due to the importance and critical role of the structure in the system of transport and traffic control, aims at achieving the goals of development plans and its impact on the development and evolution of human activities, distribution of services and reducing traffic volume, as compared to other development projects. It is essential to study the factors of time delay in the construction process, and thus making significant savings in the construction and implementation of other similar development projects, thus making significant savings on the financial and temporal dimensions. In this study, after accurate identification and introduction of case study , three main indices of project delay , each consisting of several sub - branches , are prepared in the majority of questionnaires and are weighted by a number of experts , indicators and sub - indices of project delay. In this way, the most important parameters which have the maximum contribution to the delay in the project implementation process are introduced. In the following, using the classification and gathering points and the results of the questionnaire, the most important factors for delay in the project will be identified and introduced. It should be noted that the responses obtained from the questionnaire in this study will be AHP method. According to the results of the present study, one of the most important factors affecting the time delay regarding the bridge has been classified into three main indicators related to financial factors, regulatory factors and executive management factors. Therefore, the most important sub - indicator of the delay was due to the three indicators of financial , monitoring and implementation, respectively, lack of price list nonuse of new engineering contracts such as BOO , BOT , EPC  and lack of Article 53 of the General Terms of treaty.

 One of the most important challenges for municipalities is to provide the financial resources needed to carry out the development projects required by cities. But for various reasons, projects are not implemented on an acceptable schedule and speed. One of the most important reasons is the lack of funding. The purpose of this study is to investigate the methods of financing new projects in Yazd Municipality. The data collection tool in this research is a library and a questionnaire. The statistical population of this research is Yazd Municipality employees related to the financial sector to 50 people in 2021 that the sample size using Cochran's formula was 44 people. Delphi method was used to analyze the information. The results indicate that the factors of capital participation, profit sharing, artisan, credit lines, etc. in order to reduce project operating costs are the most important methods of financing municipalities. Also, the dependence of Yazd Municipality budget on unsustainable revenue sources is one of the most important obstacles to provide new methods of financing projects.

In this study, the amount of pollution and impact of construction machinery was studied on air pollution in the project of construction of Shiraz Urban Train Station. Air pollution parameters were collected and extracted from the EPA station which is near the project implementation site, including PM10, PM2.5 , So2 , No2 , O3 , CO. Some pieces of information were collected from the Urban Train Organization. the type and number of machines involved in the project and their hours of operation from. the data collected from the Meteorological Office, the weather and the amount of dust were determined . Workshop equipment and fuel consumption were calculated based on daily workshop activities of each machine and amount of contamination was determined based on amount of fuel consumed. As well as analysis, review and percentage of air pollutants caused by construction project activity were specified. In compared to average of the pollutants, each of the pollutants caused by workshop activity with average pollutants measured by measurement station, the percentage of pollution caused by workshop activity is CO=46/56%, O3=46/48%, NO249/53%, SO2=60/68%, PM10=39/22, PM2.5=56/08. There was a direct relationship between the pollutants measured by the measuring station activity level of workshop, with highest activity index in the months when workshop showed highest number of pollutants, and at same time, air pollution monitoring station had higher numbers of pollutants in these months. it shows. Devices that have a higher workshop activity index have higher fuel consumption and a higher share of air pollution.

One of the most important manifestations of sustainable development in any country is the country's productivity of sustainable sources of income. In fact, sustainable income is the basis for sustainable urban development. In the current century municipal financing is one of the most important issues in urban management, and in our country there has always been a discussion and a place for the challenge. Accordingly, in this paper, the aim of presenting an optimal model for sustainable municipal income for construction projects is based on the use of decision-making methods and calculation of the parameters of effective parameters in the assessment of sustainable earnings in the municipality of Karaj city. In this regard, Delphi method was used to validate the validity of the questionnaire using SPSS software. Therefore, the criterion of Evaluation, judgment by a group of experts and based on completing the questionnaire and conducting interviews with accurate experts in providing financial resources and urban management. The ranking of effective measures in assessing income municipalities using the Hierarchical AHP technique was done in Super Decision software and language quantitative meter using the method the average FOWA weighted weight has been paid to prioritize earnings resources. Based on the findings of the research in the city of Karaj, among the sources of income studied by the FOWA method, it can be seen that the transitional tax option from the government to the municipality using the AHP method with a coefficient of 0/150 and in Riskiness with a coefficient of 0/166 and risk aversion with a coefficient of 0/144 with 9 indicators of the highest priority in the assessment of the supply of municipal resources for the sustainable growth of development projects.

Infrastructure and development projects in any country constitute the infrastructure and development of that country. In the implementation of these projects, financing is an important and primary concern due to the lack of infrastructure and infrastructure in the country on the one hand and the lack of capital resources on the other hand, capital has an undeniable role in this. Financing projects is one of the most common investment methods in any country. Undoubtedly, how and how to finance the projects for each level of existing institutions depends on the nature of the project. Paying attention to financing has a high share in solving the problems of financing and launching projects. Therefore, the purpose of this study is to rank the methods of financing from external sources in construction projects. The present study is applied in terms of purpose and descriptive-survey in terms of the nature of the method. In order to collect data, a questionnaire based on multi-criteria decision making method (network analysis method) was used, which was completed by five senior financial engineering experts with at least 10 years of experience in financing projects of construction companies in the west of Tehran. The collected data were analyzed by Super Decisions software. The results of financing ranking showed that international loans with a relative weight of 0.314 ranked first, BOT contracts with a relative weight of 0.21 and finance with a relative weight of 0.171 took second and third place. Findings of the study show that in general, the criterion of higher rate of return with a relative weight of 0.64 than the criteria of lower risk with a relative weight of 0.26 and a ceiling of more funds with a relative weight of 0.1 is of higher importance in financing from external sources in the project. Have civil engineering and should be given more attention.

The purpose of this study is to investigate the relationship between time management and project management among civil managers in Bushehr province. This study is a descriptive study. The statistical population of this study includes all civil managers of Bushehr province, among which 40 people were randomly selected. Data collection tools are time management questionnaire (Karami) and project management questionnaire (Enrico). Data analysis was performed using SPSS software using Pearson correlation coefficient. Findings showed that there is no relationship between work scheduling, work prioritization, delegation and telephone conversation with project time and there is a relationship between the components of meeting management, client reception and personal affairs with project time management.

Project management is an organized system and resource management so that the project is completed with a specific vision, specific quality, specific time and specific cost. Project management is the process by which a project must achieve the desired result in the easiest and most cost-effective way during its life cycle. Measuring the performance of the project team and determining the progress of the project and comparing it with the initial plan has always been and will be the concern of project managers and it can be said that project performance control with value management is the most efficient and common way to control project performance It started in the middle of the twentieth century and gradually spread. The purpose of this study is to investigate new approaches in the field of value management gained by reviewing the literature in this field. In most recent researches on the subject of value management, it has been pointed out that it is insufficient to achieve the goals of project managers. Therefore, in recent years, many researchers have tried to improve the method of managing the value gained by combining it with other methods. In construction project management, the management of acquired value is considered as a suitable tool and therefore has been implemented in various construction industries. Acquired value management is based on the belief that it increases the value of the project. Given the dynamic environment in which construction companies must operate, especially in turbulent environments that are a direct result of the recent global recession, it is important to address the executive potential of value management in the construction industry. The difference between traditional value management forecasting approaches and new value management approaches in project management can be a way out of problems and shortcomings in this area.

Compensation for the professional activities of engineers in today's industrial life will be possible only in the shadow of this branch of law. One of the most important problems of the country in the field of construction is the lack of a comprehensive and clear definition of the supervising engineer of the building. Even people working in this field do not really know this position well and with a superficial view, the only main task of these engineers is to adapt the plan to the construction of the building. Given this importance in this article, we intend to analyze the legal aspects of the responsibility of the building supervising engineer.

Nowadays, due to increasing construction in the country, especially in metropolises and problems arising during the implementation of construction projects, there is a need for coordination between the architect in design, the structural engineer in the design of the structure and the installation engineer in the design of the installation phases and Collaboration with these engineers in different phases is increasingly felt. In many parts of the world, all phases of architecture, structures, and installations continue to work as part of a design team and along with the implementation phase, to address deficiencies, while there is less coordination in our country. And once the drawings of each phase have been finalized, the relevant phase engineer imagines his work to be completed and no longer assumes responsibility for his design work at runtime. In the meantime, the Supervisor Engineer and the Project Development Team, due to the lack of access to the Design Engineers, have a taste for the problems that may arise, sometimes causing greater engineering and safety damage. This study attempts to show some of the discrepancies between the phases and the discrepancies between engineers at the time of project implementation and some performance issues.

Construction companies are different from most other companies and face many unique challenges and problems that companies in other industries do not face. Yerevan Airport, which was privatized in 2001 through a 30-year Build-Operation-Transfer agreement (BOT), is owned by Armenia International Airports Company. The Corporacion America Group of Companies, listed on the New York Stock Exchange as a public company, manages Armenia International Airports. As a subset of this group, all the functions of the Armenian airports affect the overall performance of the group.

Today, planning and the art of management play a vital role in development projects as one of the components The main steps in the progress of projects are initial planning, then organizing and coordinating resources, and so on Proper guidance and precise control. Failure to pay attention to this important role can play a destructive role, as well Which was observed to be the most influential factor, cost and increase time and finally quality which is less influential In the pillars of the project. So in the process of planning projects carefully, success in decision making It comes with a strategy. Since a successful manager is one of the elements of his existence, management, then the effect Planning and control can revolutionize the project, followed by the further flourishing of development projects Have a country.

In construction projects, especially large projects, machinery has a significant share. GPS TRACKER is a very valuable tool for construction companies to help them control expensive machinery, from mobile towers and cranes to excavation equipment and heavy trucks. Tracking large assets such as expensive construction machinery at any time and place is essential for large projects and helps a lot in managing machinery.

Human resource efficiency is an important concern of modern organizations; because it is considered as the most basic stimulus to achieve desired results and promote competition. Improving the efficiency of human resources in any organization requires investment, or in other words, the ways to use various types of capital to increase efficiency, and recognizing any type of capital in order to improve the efficiency of human resources is necessary. Therefore, the present study aimed at presenting the causal model of human capital efficiency in civil projects based on social capital and knowledge sharing. The applied objective of the present study and the data collection procedure is descriptive and correlational. The participants of the present study included the 300 hundred employees of Shiraz Municipality's Deputy for Civil Engineering. Sampling method in groups and sample volume through Cochran formula 168 was identified. A standard questionnaire was used for data collection procedure and measuring the research variables. The content validity of the measuring instrument was confirmed and its reliability was confirmed by Cronbach's alpha coefficient. Lisrel software was used to analyze the data. The results of path analysis showed that the dimensions of social capital have a significant effect on the efficiency of human capital in civil projects .the results also showed that knowledge sharing played a significant role in social capital and efficiency of human capital in civil projects.