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Showing 2 results for Risk Assessment
Dr Mohammad Javad Bashirpour, Dr Hakimeh Morabbi Heravi,
Volume 12, Issue 2 (11-2021)
Abstract
Establishing safety at work is one of the essential and necessary conditions for starting, performing, ending and exploiting work. Due to the importance of this issue, in the present study, the evaluation and management of safety risks in the construction industry in the direction of human health using multi-criteria decision-making techniques have been done. In the framework of the proposed method, safety risks in construction projects were first extracted according to the study of previous researches and opinion polls of experts and experts, who are divided into four general categories including machinery, fire, work at height and unexpected accidents. Then the questionnaire is designed based on these risks and is distributed among the statistical sample. After reviewing the validity and reliability of the questionnaire, the mentioned factors are ranked based on the costs of providing workforce for safety and health of workforce using the fuzzy hierarchical analysis method. The results of fuzzy hierarchical analysis method show that the factor of people getting stuck between machines is the most important that should be considered in all stages. The next most important factor is the accident with the machines. The third factor is the throwing of materials from machines. Thus, due to financial constraints in this regard, in order to manage safety in construction projects, it is necessary frst to consider the factors that have priority. In the end, based on the obtained rankings, suggestions are provided in order to ensure the health of human resources.
Mr. Arman Gholinezhad Paji, Dr. Ali Borozgi Amiri, Prof. Reza Tavakkoli Moghaddam,
Volume 15, Issue 2 (12-2024)
Abstract
The expansion of gas transmission lines in Iran involves numerous risks, requiring regular assessments to ensure safe and efficient transport. This study examines six kilometers of Iran’s oldest gas pipeline, located in Tonekabon, a densely populated and touristic city. The pipeline was divided into six zones, considering pipeline class, population density, and intersections. In each zone, three events—leakage, rupture, and explosion—were assessed using four methods: simple matrix, weighted matrix, fuzzy weighted matrix, and a 3D uncertainty-based matrix. Four experts evaluated the probability and severity of consequences, categorized as technical, safety, environmental, and cost impacts. The consequences enabled risk calculation across all categories. Standard deviation was used to compute a three-dimensional uncertainty-based risk, incorporating uncertainty in both probability and consequence estimation. Risk management levels were then adjusted accordingly. Chang’s fuzzy AHP method and Mamdani’s fuzzy logic in MATLAB were applied to handle inherent uncertainties. Results showed discrepancies between simple and fuzzy matrices due to the exclusion of cost impacts, given the state-owned nature of the company. The 3D matrix further indicated that most risk cells require only preliminary review, attributed to the company’s regular inspections and access to reliable data.
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