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Seismic Soil-Structure Interaction a...

Turner, Matthew M.

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Seismic Soil-Structure Interaction and Foundation Rocking in Unsaturated Ground.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Seismic Soil-Structure Interaction and Foundation Rocking in Unsaturated Ground./
Author:	Turner, Matthew M.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	258 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
Contained By:	Dissertations Abstracts International84-12B.
Subject:	Civil engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30248781
ISBN:	9798379684143

Seismic Soil-Structure Interaction and Foundation Rocking in Unsaturated Ground.
Turner, Matthew M.

Seismic Soil-Structure Interaction and Foundation Rocking in Unsaturated Ground. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 258 p.

Source: Dissertations Abstracts International, Volume: 84-12, Section: B.

Thesis (Ph.D.)--University of New Hampshire, 2023.

This item must not be sold to any third party vendors.

Strong earthquake motions often cause severe damage to buildings and foundation systems, during which the interaction between the soil, foundation, and structure may dominate the seismic response. Most shallow foundations are located on, or embedded in, unsaturated and partially saturated soil deposits. Unsaturated soil layers are particularly common in zones above the water table where water can rise through different mechanisms like capillary action. Additionally, the degree of saturation throughout a soil deposit can vary both seasonally and yearly due to groundwater table fluctuation related to infiltration and evaporation. Properties of soil layers below foundations impact the seismic response of structural systems. Since soil moisture impacts soil properties, it is expected that changes in groundwater table depth would impact the seismic response of foundations and structures. However, the understanding of the mechanisms by which the degree of saturation and water table depth influences the foundation and structural response needs improvement. This dissertation aimed to evaluate the effect of the depth of the groundwater table on the seismic response of soil-foundation-structure systems and to extend current seismic design guidelines leading to the implementation of rocking foundations in practice.Three sets of dynamic centrifuge experiments were conducted on four physical models representing three prototype structures. The prototype structures included elastic and inelastic single-degree-of-freedom structures as well as single- and two-span bridge systems. The elastic single-degree-of-freedom structure and bridge systems were designed to incorporate rocking foundations, while the inelastic single-degree-of-freedom structure incorporated structural fuses designed to guide plastic deformations to above-ground structural locations. Physical models were slightly embedded in sandy silt layers with various groundwater table depths and subjected to a series of seismic motions. The experimental findings highlight the influence of the groundwater table depth on changes to the foundation and structural deformations and rotations, foundation level overturning moments, period lengthening, and damping ratios. Furthermore, design procedures to predict several seismic response properties of a structure resting on unsaturated soil layers are derived in this research based on the fundamentals of unsaturated soil mechanics. These properties include the overturning moment capacity of the foundation, the initial rotational stiffness of the foundation, and the period lengthening and foundation damping ratio. Properties derived from these design guidelines are compared to the experimental results to judge the viability of implementation in practice or signify the need for further improvement. 

ISBN: 9798379684143Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Bearing capacity

Seismic Soil-Structure Interaction and Foundation Rocking in Unsaturated Ground.
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245 1 0 $a Seismic Soil-Structure Interaction and Foundation Rocking in Unsaturated Ground.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 258 p.
500 $a Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
500 $a Advisor: Ghayoomi, Majid.
502 $a Thesis (Ph.D.)--University of New Hampshire, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a Strong earthquake motions often cause severe damage to buildings and foundation systems, during which the interaction between the soil, foundation, and structure may dominate the seismic response. Most shallow foundations are located on, or embedded in, unsaturated and partially saturated soil deposits. Unsaturated soil layers are particularly common in zones above the water table where water can rise through different mechanisms like capillary action. Additionally, the degree of saturation throughout a soil deposit can vary both seasonally and yearly due to groundwater table fluctuation related to infiltration and evaporation. Properties of soil layers below foundations impact the seismic response of structural systems. Since soil moisture impacts soil properties, it is expected that changes in groundwater table depth would impact the seismic response of foundations and structures. However, the understanding of the mechanisms by which the degree of saturation and water table depth influences the foundation and structural response needs improvement. This dissertation aimed to evaluate the effect of the depth of the groundwater table on the seismic response of soil-foundation-structure systems and to extend current seismic design guidelines leading to the implementation of rocking foundations in practice.Three sets of dynamic centrifuge experiments were conducted on four physical models representing three prototype structures. The prototype structures included elastic and inelastic single-degree-of-freedom structures as well as single- and two-span bridge systems. The elastic single-degree-of-freedom structure and bridge systems were designed to incorporate rocking foundations, while the inelastic single-degree-of-freedom structure incorporated structural fuses designed to guide plastic deformations to above-ground structural locations. Physical models were slightly embedded in sandy silt layers with various groundwater table depths and subjected to a series of seismic motions. The experimental findings highlight the influence of the groundwater table depth on changes to the foundation and structural deformations and rotations, foundation level overturning moments, period lengthening, and damping ratios. Furthermore, design procedures to predict several seismic response properties of a structure resting on unsaturated soil layers are derived in this research based on the fundamentals of unsaturated soil mechanics. These properties include the overturning moment capacity of the foundation, the initial rotational stiffness of the foundation, and the period lengthening and foundation damping ratio. Properties derived from these design guidelines are compared to the experimental results to judge the viability of implementation in practice or signify the need for further improvement. 
590 $a School code: 0141.
650 4 $a Civil engineering. $3 860360
650 4 $a Soil sciences. $3 2122699
650 4 $a Environmental engineering. $3 548583
653 $a Bearing capacity
653 $a Centrifuge modeling
653 $a Partial saturation
653 $a Rocking foundations
653 $a Soil-structure interaction
653 $a Groundwater table
690 $a 0543
690 $a 0775
690 $a 0481
710 2 $a University of New Hampshire. $b Civil Engineering. $3 2094650
773 0 $t Dissertations Abstracts International $g 84-12B.
790 $a 0141
791 $a Ph.D.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30248781