Abstract
During a tsunami event, neighboring structures can significantly influence the forces experienced by an individual structure within an urban community. To assess the effects of adjacent structures on the resulting fluid flow, and the corresponding pressures and forces exerted on a structure, two tsunami-like waves were generated in the Large Wave Flume at the Hinsdale Wave Research Laboratory (HWRL) at Oregon State University. The forces and pressures on an elevated structure were measured for a reference geometry without neighboring structures, as well as for five structure configurations that included one or two neighboring structures arranged in layouts meant to be representative of prototypical rectangular buildings in subsections of a coastal community. Results showed that adjacent structures can shield a structure from the flow, causing decreased total forces with increasing blockage ratios. However, local channelization of the flow was found to increase local pressures, increasing the demands on structural components. Comparisons with ASCE 7-16 methods for determining force increase ratios due to channeling showed strong agreement for channeling-dominated configurations and bore-like waves that broke before impacting the elevated structure. In contrast, shielding-dominated configurations and waves that were unbroken on impacting the elevated structure showed that the ASCE 7-16 methods would overestimate force increase ratios.
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Acknowledgments
This study was funded by the National Science Foundation through grants CMMI-1536198 and CMMI-1519679 and is based on work supported by the Hinsdale Wave Research Lab (HWRL) at Oregon State University, which is a major facility funded by the National Science Foundation. The authors thank the staff at the HWRL for their contributions to this project. The authors thank Xinsheng Qin, Zeyad Al-Sayhood, Victoria Johnson, Cassidy Gills, and Hyoungsu Park for their contributions to this project.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146 • Issue 4 • July 2020
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© 2020 American Society of Civil Engineers.
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Received: Sep 13, 2018
Accepted: Jan 10, 2020
Published online: May 11, 2020
Published in print: Jul 1, 2020
Discussion open until: Oct 11, 2020
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