Estimating the Frequency of Exposure to Uncertain Hazards: Impact of Wind Conditions on Concrete Dam Construction
Publication: Journal of Construction Engineering and Management
Volume 147, Issue 2
Abstract
Due to the narrow construction site, intensive construction, and constant strong winds, some concurrent activities during concrete dam construction are proven to lead to space conflicts and increase the frequency of exposure to hazards. Despite some valuable contributions, the current methods for quantifying exposure frequency are still subjective and inadequate for reliable safety evaluation. Therefore, this study provides a formal approach to identify exposure under dynamic wind loads and to estimate exposure frequency to scrutinize dynamic interactions at construction sites. In this study, first, the force of hazard with wind loads is analyzed to identify the impact of potential hazards from vertical concrete transport in an undesirable event. Second, combined with the concrete dam construction cycle process and the operating time characteristics, the probability of hazards and victims concurrently appearing in an overlapping space is calculated to measure the possibility of disastrous events from the perspective of spatial and temporal attributes. Then, the exposure frequency is expressed using statistical information on wind conditions, location information on the site layout, and mechanical motion parameters. In contrast to traditional risk-assessment methods, the proposed model combines the uncertainty of wind and the probability of hazards and victims simultaneously appearing in an overlap into a more rigorous safety perspective. Finally, the model’s capability of hazard exposure assessment is demonstrated and tested by applying it to a case study of a major real-world construction project. The results show that the novel methodology is able not only to quantify the exposure frequency with the contribution of the influence of strong winds but also to assess the risk of dam construction projects. Furthermore, this method will provide an important objective and precise evaluation tool for hazard exposure.
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Data Availability Statement
The data generated or analyzed during the study are available from the corresponding author by request. Information about the Journal′s data-sharing policy can be found here. http://ascelibrary.org/doi/10.1061/(ASCE)CO1943-7862.0001263.
Acknowledgments
This study is sponsored by the National Natural Science Foundation of China (Grant No. 52079073), Hubei Province Hydropower Engineering Construction and Management Key Laboratory (China Three Gorges University) Open Fund (Grant No. 2020KSD05), and the China Scholarship Council (Grant No. 20180842018).
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Journal of Construction Engineering and Management
Volume 147 • Issue 2 • February 2021
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© 2020 American Society of Civil Engineers.
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Received: Feb 17, 2020
Accepted: Aug 24, 2020
Published online: Dec 2, 2020
Published in print: Feb 1, 2021
Discussion open until: May 2, 2021
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