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Characterization of Soil-Structure Interface Properties supporting Seismic Hazards and Fire.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of Soil-Structure Interface Properties supporting Seismic Hazards and Fire./
作者:	Shahraki, Marzieh.
面頁冊數:	1 online resource (182 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-03, Section: B.
Contained By:	Dissertations Abstracts International84-03B.
標題:	Engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29326088click for full text (PQDT)
ISBN:	9798351444253

Characterization of Soil-Structure Interface Properties supporting Seismic Hazards and Fire.
Shahraki, Marzieh.

Characterization of Soil-Structure Interface Properties supporting Seismic Hazards and Fire. - 1 online resource (182 pages)

Source: Dissertations Abstracts International, Volume: 84-03, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2022.

Includes bibliographical references

The interaction between a structure and adjacent geomaterial can significantly alter the overall system behavior during a hazard. Thus, the design process should consider the influence of soil-structure interaction on developing enhanced procedures for mitigating failure, assessing damage, and facilitating recovery following extreme events. Accordingly, this dissertation has two objectives: (1) to characterize the soil-concrete foundation interface in order to better understand the sliding behavior at this interface, which could be used as an energy dissipation mechanism to lower the risk of structural failure; (2) to quantify temperature-dependent properties of rock and concrete, which can be used when evaluating structural fire resistance of tunnels considering soil and concrete liner interaction.In seismic design, sliding of a shallow foundation on soil is prevented, whereas, in a sustainable design approach, it is considered an energy dissipation mechanism. Details on soil-structure interaction at the interface are necessary to further enhance the latter technique while fulfilling the safety requirements. The behavior of the interface between soils and shallow concrete foundations was investigated through a large-scale experimental study in the first part of this dissertation. Three surfaces, including rough and smooth concrete and a waterproofing membrane attached to the concrete block, were sheared monotonically under a range of normal pressure on dry sand, saturated sand, and crushed gravel. To eliminate the uncertainties in the load transfer mechanism at the interface, the behavior was investigated on a macroscopic as well as microscopic scale. Key data from the experiments, including shear strength, friction parameters, shear zone formation, and real area of contact at the interface, were curated and presented, and the effects of different parameters were investigated. According to the findings, the relationship between foundation surface roughness, grain size, and hardness results in normal pressure dependency, as well as different shear resistances and shear zone formation characteristics.The second part of the dissertation focuses on characterizing the temperature-dependent properties of concrete and nearby geomaterials for application in the design and assessment of tunnel liners for fire. To evaluate rock properties during and after a fire, three rock types were tested at ambient temperatures, during and after exposure to elevated temperatures. The results showed that, within the tested temperature range, the residual elastic moduli of the rock samples were not temperature dependent. Existing experimental data on the residual compressive strength of normal strength concrete in the literature was collected and analyzed. Parameters related to aggregate type, concrete mix, and testing protocol were studied to identify influential features that could be utilized to reduce scatter in the data. The refined data was then utilized to develop probabilistic models for the residual compressive strength of siliceous and calcareous concrete. The proposed models followed the Weibull distribution and were continuous functions to enable implementation in analytical and computational frameworks. The medians of the proposed models and data were close to the Eurocode 2 reduction factors for the siliceous concrete but fell below the Eurocode 2 reduction factors for concrete with calcareous aggregate.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798351444253Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

Soil-structure interfaceIndex Terms--Genre/Form:

542853
Electronic books.

Characterization of Soil-Structure Interface Properties supporting Seismic Hazards and Fire.
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520 $a The interaction between a structure and adjacent geomaterial can significantly alter the overall system behavior during a hazard. Thus, the design process should consider the influence of soil-structure interaction on developing enhanced procedures for mitigating failure, assessing damage, and facilitating recovery following extreme events. Accordingly, this dissertation has two objectives: (1) to characterize the soil-concrete foundation interface in order to better understand the sliding behavior at this interface, which could be used as an energy dissipation mechanism to lower the risk of structural failure; (2) to quantify temperature-dependent properties of rock and concrete, which can be used when evaluating structural fire resistance of tunnels considering soil and concrete liner interaction.In seismic design, sliding of a shallow foundation on soil is prevented, whereas, in a sustainable design approach, it is considered an energy dissipation mechanism. Details on soil-structure interaction at the interface are necessary to further enhance the latter technique while fulfilling the safety requirements. The behavior of the interface between soils and shallow concrete foundations was investigated through a large-scale experimental study in the first part of this dissertation. Three surfaces, including rough and smooth concrete and a waterproofing membrane attached to the concrete block, were sheared monotonically under a range of normal pressure on dry sand, saturated sand, and crushed gravel. To eliminate the uncertainties in the load transfer mechanism at the interface, the behavior was investigated on a macroscopic as well as microscopic scale. Key data from the experiments, including shear strength, friction parameters, shear zone formation, and real area of contact at the interface, were curated and presented, and the effects of different parameters were investigated. According to the findings, the relationship between foundation surface roughness, grain size, and hardness results in normal pressure dependency, as well as different shear resistances and shear zone formation characteristics.The second part of the dissertation focuses on characterizing the temperature-dependent properties of concrete and nearby geomaterials for application in the design and assessment of tunnel liners for fire. To evaluate rock properties during and after a fire, three rock types were tested at ambient temperatures, during and after exposure to elevated temperatures. The results showed that, within the tested temperature range, the residual elastic moduli of the rock samples were not temperature dependent. Existing experimental data on the residual compressive strength of normal strength concrete in the literature was collected and analyzed. Parameters related to aggregate type, concrete mix, and testing protocol were studied to identify influential features that could be utilized to reduce scatter in the data. The refined data was then utilized to develop probabilistic models for the residual compressive strength of siliceous and calcareous concrete. The proposed models followed the Weibull distribution and were continuous functions to enable implementation in analytical and computational frameworks. The medians of the proposed models and data were close to the Eurocode 2 reduction factors for the siliceous concrete but fell below the Eurocode 2 reduction factors for concrete with calcareous aggregate.
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