جستجوی مقالات مرتبط با کلیدواژه "مهندسی ارزش" در نشریات گروه "عمران"

Today, the use of pits in construction projects is increasing due to the maximum use of land and also the high price of land. The use of methods to maintain stability, security, time and cost has always been a concern of employers and those involved in excavation projects. Value engineering is a way to achieve the optimal state in carrying out construction projects, which is effective in reducing project time by eliminating additional costs as well as ineffective activities without affecting the process and operation of the project. Due to the importance of two issues in this research, an attempt has been made to investigate the factors affecting excavation projects by adopting a value engineering approach. In this research, the staticity of the pits based on truss, concrete pile, nailing and anchor methods as well as the use of soil rupture wedge as an innovative method for stabilizing shallow, semi-deep and deep pits have been investigated. The results are evaluated in terms of cost, time, pit security and occupied space and are evaluated and weighted using Analytic Hierarchy Process (AHP). The results show that the use of wedge rupture method in shallow excavations can be a good option in terms of value engineering. Also, using concrete pile method for semi-deep pits and using anchorage method for deep pits according to the results are considered suitable options.

Purpose and subject: Concrete is one of the most widely materials used in construction projects, whose technology is very broad and includes various specialties. On the other hand, the importance of construction projects in various areas of the national economy and industry of the country is undeniable, and since these types of projects are inherently risky, in the present research, the risks of not using advanced concrete in these projects are investigated and value engineering is used to reduce their effects. For this purpose, in the framework of the proposed method, first, the risks caused by not using advanced concrete in construction projects were extracted according to the opinion of experts and specialists in this field and confirmed using statistical methods. Then the relevant risks were prioritized and ranked using value engineering. The results showed that the three risks that have the highest priority are: customer dissatisfaction, reduced price and lack of resistance to earthquakes. At the end, suggestions were made to reduce these risks.

Value Engineering (VE) enables project managers to discover the size and location of problems in a project and to mitigate any potential backwardness. The current research aimed to find major impressive criteria and to measure their impact level on promoting the value of large-scale/mega projects using VE concepts. The hindrance and obstacles available in the application of VE in construction engineering were considered to ensure the accuracy. The main research objective was to forecast the effect of quality, cost, and time factors on the project value using an adaptive neuro fuzzy inference system (ANFIS) model. To create the ANFIS model, the required data were collected through a five-point scale Likert questionnaire, by which the expert opinions were obtained, and pairwise comparisons of the items were accomplished. The model was created using MATLAB. The statistical population was adopted from the experts and managers working in a large-scale project who were familiar with the concepts and details of VE and project management. According to the literature, more than 50 VE criteria were found, which were then reduced to 25 criteria based on experts’ opinions. These final criteria were categorized into three groups: cost, time, and quality. Afterwards, the data collected via the questionnaires were analyzed by the ANFIS model. Before completing the calculations, validity and reliability of the analytical model were investigated to ensure that the results are both valid and reliable enough for further use. The results showed that the criterion entitled ‘proper programming …’ had the highest impact on promoting the projects value, while the criterion entitled ‘prevention of work and responsibility interference …’ had the least influence. Both of the mentioned criteria were situated in the group of cost, indicating the higher importance of this group than that of the other groups.

One of the limitations of mechanized tunnel excavation compared to traditional excavation methods is the creation of tight curve. In addition, excavation problems and limitations are doubled if small radius curves are combined with surface and subsurface obstacles. Typically, there are options available to designers to deal with these obstacles, such as rerouting, proposing remodeling and improvement, and protection plans in the pre-construction phase. According to the initial design of the plan and profile in the western tunnel of the Mashhad urban railway line 3 project, some part of the implementation of the route has faced important challenges, including the synchronization of the 300-meter curve with passing high-rise residential and commercial structures in the region. After studies and investigations, the implementation of the curve with an unusual radius of 270 meters was put on the agenda. Necessary actions have been taken to prevent excavation problems in the tight curve. Some of these actions include the implementation of protection plans for the southern buildings of Ferdowsi Avenue and the Ziba Sazeh building, replacement of brushes and cutting tools, determining the correct position of the key in the ring, special arrangement of inverts and conveyor design that resulted in high quality excavation in the curve. In terms of value engineering, the selection and implementation of a curve with a radius of 270 meters, is equivalent to 20 billion rials in savings.

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.

Value engineering is a creative approach to optimizing life cycle costs, saving time, increasing profits, improving quality, and optimizing the use of resources. This management approach in Iran also has numerous project backgrounds, and many of the country's executive agencies use it in projects. Implementing a value engineering approach in hydraulic structures enables systematic behavior to balance project costs and performance, relying on teamwork and creativity to eliminate unnecessary costs and increase efficiency. And take more effective steps to make projects more efficient. Implementation of this method has yielded tangible results worldwide and even in Iran, from which the Maroun Regulatory Dam, the Ramshir Dam Control Channel, the Kuhrang Dam diversion tunnel, and more can be mentioned. Reservoir dams are major national and multipurpose projects that aim to conserve water for drinking, agriculture, industry, power generation, flood control, tourism, cultural and recreational activities. The major problem most large projects face is the lack of value engineering. The purpose of this research is to apply value engineering in the implementation of Kowsar Gachsaran reservoir dam located in Kohgiluyeh and Boyer Ahmad province. In this research, value engineering methodology was used by "Analytical Hierarchy Process" method. The results showed that the cost of implementation of dam body with value engineering application decreased by 8.47%, equivalent to 5.8 billion Tomans; about 20.25% decrease in execution time and 9.25% increase in performance quality.

Due to the rapid changes in the environment and business, only organizations in this environment will survive that are active and able to respond quickly to environmental requirements. Therefore, it is very important to pay attention to value engineering programs and plans in organizations and construction projects in order to improve and improve the quality level and improve products and services. Using value engineering in executive projects can become a tool for managing and controlling costs, given the complexity of the work, especially in large-scale development projects. Valuable engineering can improve and enhance the quality of new processes at any stage of an implementation project. Given that the Stone Creativity Phase is the cornerstone of value engineering projects, any improvement and reduction in cost and value created by system reform is due to the production of valuable ideas in the Value Engineering Creativity Phase. . In this research, while reviewing articles, books and valid standards through library studies, presenting and analyzing the current situation of value engineering in various construction projects, examining the obstacles facing the application of this methodology and implementing strategies to eliminate this damage. And the correct use and outcome of value engineering have been proposed.

Systematic decision making by managers is carried out by conventional methods including input, processing and output methods, although there are no planned inputs for executing value engineering and sustained research in manager decision making. Compliance, quality, reliability, and performance enhancement are all managed by the project manager without compromising on its future needs. It reviews managers' decisions as well as disruptions Engineering covers value and its relationship to management and the project.

Value engineering is an organized effort to analyze the performance of systems, equipment, services, and institutions in order to achieve real performance with the lowest cost of project lifetime, which is consistent with the quality and safety of the project. Value engineering is one of the improvement and problem-solving techniques that has been proven to be effective over more than half a century in various industrial, service, construction, and manufacturing sectors. Expansion of the application of value engineering in the design and implementation of construction projects indicates the ability of this approach to reduce the cost of increasing and improving the quality of the project and creating added value that can play a significant role in the successful implementation of development projects that the budget and cost section plays And leads to an effective upgrade of quality and lower costs. In this paper, we have investigated the value engineering approach in designing and implementing construction projects. The results obtained from the assumptions of the research indicate that 5 assumptions have been confirmed. Also, the reliability of statistical tests was determined by designing the neural network

The increasing speed of changes in technologies and markets and in customers nature and on the other hand the intensifying competition between organizations, has led companies to intensively seek new competitive advantages to excel among competitors and do better in meeting the needs and demands of customers. Hence, it is crucial to have a new solution which is to move towards the creation of organizations that can be fast and flexible in responding to changes in unstable and unpredictable environments. therefore It is imperative for companies to either directly or indirectly,deal with the changes that can threaten their ability to survive Agile management and value engineering are creating new paradigms for managing highly competitive organizations and firms . In this article, authors are seeking to improve the competitiveness of Iranian contractor companies by utilizing value engineering and agile approaches, first, by performing library studies, competitiveness indicators and factors that have effects on them were identified and have been presented. with the results from conducting interviews with Experts ,we screened these indicators and found their effective factors and then with the help of a questionnaire these indicators were ranked. Then, the components affecting the organization's agility were identified and finally,by conducting value engineering in projects, improvements that affect the competitive advantages of companies were identified and a conceptual model of the combination of the three themes was presented. In this model, we reached the answers to the research's questions.(hypothesis)

A large portion of the budget of many countries in the world is spent on the transportation projects. Often these projects are capital-intensive in the all of transportation systems, and for this reason, any savings -even small saving- in these projects, could lead to considerable economic benefits. The value engineering is one of the powerful management and cost saving techniques that is capable of significant decreasing in construction cost and time, as well as increasing project performance and value.
In many cases, due to budget limitation, concurrent implementation of multiple projects in the transportation sector is not possible and it is essential that the approved projects prioritized and implemented based on specified criteria. The value engineering focuses on the criteria which could lead to the significant decreasing in the project implementation cost and time, and elimination of unnecessary activities. This research is based on railway transportation expert comments for developing eleven appropriate criteria using value engineering concept for evaluation and prioritizing five projects of the new rail lines construction by applying an ANP model. Based on the results, implementing the “bam-jiroft” project has the highest implementation priority and also the “implementation cost” criterion has the greatest weight compared to other used criteria. In addition based on the results of this study, a framework is proposed for review in the budget allocation management according to the weight of each project which it can be used to reform the current system of budget allocation. In the following, in order to analyze the results, the obtained results of the ANP are confirmed by using four other decision-making models. Also the sensitivity analysis results show that the proposed prioritization model has the highest sensitivity to the “reducing the number of road accidents” criterion and the lowest sensitivity to the “operating cost” criterion.

Value engineering has been used for more than 50 year as a successful technique in the upstream authorities and documents of Iran. Although it has been used in the role of an effective method to improve the constructive projects and plans, value engineering has not reached its real position yet. This can be attributed to many reasons such as optimistic view of managers towards the results of a project, improper understanding of the technique, and insufficient culture and motivation among project components as well.
This study aims to codify motivation authorities of the value engineering in addition to evaluate necessities of motivating the value engineering parameters in Construction and Development of Transportation Infrastructure Company (CDTICO) as one of the most important firms with many huge projects in Iran. Thereby, value engineering can enable the company and many other governmental organizations to utilize this advantageous technique more than any time before. This research has been conducted by using advices from value engineering experts through interviews and questionnaires since they were sufficiently familiar with CDTICO.

One of the biggest items in decision-making is selecting the best choices considering all their aspects. In the meantime, employing an instrument that can guide the choice in a structuralized way is very useful. In this research, value engineering along with hierarchical analytic processing method as instruments to select the best choice for the type of dam and the spillway are utilized. To do this, three categories of operational cost, time and performance as the main indicators of decision-making have been considered. The results revealed that the best choice is the roller compacted concrete dam with free spillway.

Bus rapid transit system is a creative and functional system than the traditional bus system and by using value engineering the value index and efficienay of this system can be improved. Line 1 of Mashhad BRT system was examined by using the three steps of value engineering (included pre-study, workshop and after study). Then 78 Ideas were selected in 14 packages. Finally, results were formed by combination of selected ideas (7 of them is technical view and 3 of them is economical view). The economical results improve the value indexes and effect on the quality.

As it mentioned in the literature the key factors in construction projects success are cost, quality and time. The construction supply chain management (which manage both suppliers and subcontractors relationship with the general contractor) is one of the most essential approaches in improvement of these factors in the construction industry. Thus, the construction companies are inevitable to improve their supply chain management. In this research, firstly, the authors represent the conceptual coordination between value engineering and construction supply chain management. Next, the results of their simultaneous implementation in the project management are specified. At last, the steps of executing value engineering in the construction corporations’ organization are represented.