Updated Dynamic Amplification Factors of Existing Short Span Bridge Considering the Debris Effects
Publication: Earth and Space 2021
ABSTRACT
During extreme flooding events, submerged bridge components would encounter strong lateral fluid forces. With lateral flowing water, debris, such as sediments or tree branches can be transported along rivers and accumulate on submerged components. With debris accumulations, short span bridges are required to resist additional fluid pressure due to the increasing current-obstruction area. Besides, debris accumulations would accelerate bridge scour process, as well, due to increasing flow speeds. The floating debris can also directly impact bridge foundations and affect the dynamic behaviors. Many bridges collapse due to fluid forces and debris impacts during flooding events. Few studies have been conducted to investigate the structural behaviors of bridges considering the effects of debris. In the present study, the dynamic analysis for OSBs is conducted with the consideration of debris accumulations and debris impacts. Firstly, a short span OSB is simulated with foundation scour due to possible debris accumulations. Secondly, the fluid pressure applied to the OSB is updated considering an extra blocking area due to accumulated debris. The collision forces due to floating woody debris are also introduced into the analysis. Thirdly, the dynamic amplification factors with and without considering the effects of debris impacts are calculated and compared. Finally, some conclusions are drawn about how to simplify the effects of debris impacts on the dynamic responses of bridges.
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Earth and Space 2021
Pages: 414 - 424
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© 2021 American Society of Civil Engineers.
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Published online: Apr 15, 2021
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