| Summary: | 博士 === 國立中興大學 === 土木工程學系所 === 97 === Construction workers usually perform jobs that involve overexertions and awkward postures in restricted working environments with less use of machinery. Their work, as a result, is physically very demanding. Physically demanding work may not only lead to physical fatigue but also lead to negative problems such as the loss of productivity, poor quality work, reduced job satisfaction, and possible musculoskeletal disorders. Possible preventive measures such as proper organization of work can be used to avoid physical fatigue in workers. The proper design of a work-rest schedule may be effective in improving a worker’s comfort, health, and productivity.
This research develops a theoretical model that can be used to create work-rest schedules for construction workers. Two objectives are proposed in the optimization processes when such schedules are created. These objectives include minimizing the time for completing jobs and minimizing any extra energy expended by laborers due to inappropriate work assignments that force them to work longer than the maximum acceptable work duration. A GA-based mechanism was developed to search the Pareto front, which is one of the effective ways for solving multiobjective optimization problems. Such a mechanism was implemented by computer programming using a numerical software tool called MATLAB. Theoretical examples demonstrated that the proposed model efficiently created work-rest schedules.
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