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-
- Description:
- This thesis deals with modeling long-term deformation and failure of concrete and shale structures. First concrete structures are studied. For concrete structures, design lifetime of over a hundred years is required. Shrinkage, swelling, creep and Alkali-silica reaction are significant parts of the long-term deformation of concrete and are studied here....
- Keyword:
- Alkali-Silica Reaction, Creep and Shrinkage, Branching of Hydraulic Cracks, Microprestress, Creep of Shale, and Cement Hydration
- Subject:
- Geophysics, Computational physics, and Civil engineering
- Creator:
- RAHIMI-AGHDAM, SAEED
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14537 and etdadmin_upload_640235
-
- Description:
- Phononic crystals and acoustic metamaterials exhibit unique wave propagation properties rising from periodicity and the heterogeneity in material/structure design. One important property is tailoring the propagation of elastic waves from band gaps in such systems – frequency ranges of strong wave attenuation. This thesis first explores the idea of gaining...
- Subject:
- Mechanics and Civil engineering
- Creator:
- Han, Jialun
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14471 and etdadmin_upload_627248
-
Multiscale Assessment of the Role of Particle-Scale Attributes on the Crushability of Granular Soils
- Description:
- Granular materials are ubiquitous elements of our daily life, representing some of the most manipulated materials on Earth and playing a key role in disparate fields of science and engineering. Considerable research has been performed to explore the factors that impact the mechanical behavior of granular materials. Within this context,...
- Keyword:
- grain breakage, discrete element modeling, constitutive modeling, X-ray microtomography, subcritical crack growth, and creep
- Subject:
- Geotechnology and Civil engineering
- Creator:
- Sohn, Changbum
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_617984 and http://dissertations.umi.com/northwestern:14408
-
- Description:
- The dissertation systematically delineates the mechanically-guided deterministic assembly of three-dimensional (3D) mesostructures by compressive buckling, covering topics from mechanics concepts, design and analysis, fabrication techniques, to application opportunities. The development of approaches to form complex 3D functional mesostructures in advanced materials is a topic of broad interest, thanks to the...
- Subject:
- Materials Science, Mechanical engineering, and Civil engineering
- Creator:
- Luan, Haiwen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14682 and etdadmin_upload_663249
-
- Description:
- This research especially helps for the design of concrete structures which has to last at least for 100 years such as bridges. The research aims to give a better prediction of long-term deformations of concrete and improve the structure design based on these predictions. The accurate prediction helps in capturing...
- Subject:
- Civil engineering
- Creator:
- Rasoolinejad, Mohammad
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_685109 and http://dissertations.umi.com/northwestern:14804
-
- Description:
- Additive manufacturing (AM) processes have advanced rapidly over the last three decades to the point where they have the potential to fundamentally change the way complex parts will be designed and fabricated in the future. Additive methods leverage the ability to join metal particles or molten droplets in a layer-by-layer...
- Keyword:
- Hydrodynamic, Thermal, Laser Induced Forward Transfer, and Aperture
- Subject:
- Mechanics, Mechanical engineering, and Civil engineering
- Creator:
- Zhang, Li
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_618185 and http://dissertations.umi.com/northwestern:14414
-
- Description:
- The term compaction band identifies a rich variety of structural features of the Earth's crust that affect formations of sedimentary rocks. The most common definition for compaction band often found in the literature describes them as narrow planar zones of concentrated porosity reduction, which may involve limited to none shear...
- Keyword:
- Rock Mechanics, Constitutive Modeling, Instability Analysis, and Compaction Band
- Subject:
- Geophysics, Geotechnology, and Civil engineering
- Creator:
- SHAHIN, Ghassan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 01/21/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15067 and etdadmin_upload_739829
-
- Description:
- The effect of Alkali-Silica Reaction (ASR) on concrete mechanical behavior and the multi-physics considerations that come along are highly complex. Hydration and other chemical reactions occur at the micrometer scale. Hygro-thermal phenomena and concrete cracks due to ASR are typically studied at the meso-scale, i.e. at the aggregate level. At...
- Subject:
- Mechanics, Materials Science, and Civil engineering
- Creator:
- Pathirage, Madura
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 01/21/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15090 and etdadmin_upload_742317
-
- Description:
- The staggered (or imbricated) lamellar ``brick-and-mortar" nanostructure of nacre endows nacre with strength and fracture toughness values exceeding by an order of magnitude those of the constituents, and inspires the advent of new robust biomimetic materials. While many deterministic studies clarified these advantageous features in the mean sense, a closed-form...
- Keyword:
- Nacre, Strength, Probability, Octet-truss, Architected Material, and Size Effect
- Subject:
- Mechanics, Mechanical engineering, and Civil engineering
- Creator:
- Luo, Wen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 01/21/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15081 and etdadmin_upload_741756
-
- Description:
- The transportation infrastructure privatization is an essential solution to the public fund's shortage of transportation investments. In the privatization practices, the private firms build, operate, and own the transportation infrastructure under a limited term. Due to the private sector's involvement, the efficiency of the transportation service is determined not only...
- Keyword:
- Tolling and capacity decision, Pareto efficiency analysis, Mechanism design, Transportation infrastructure, Network analysis, and Public-private partnership
- Subject:
- Transportation and Civil engineering
- Creator:
- Shu, Hang
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_764914 and http://dissertations.umi.com/northwestern:15283
-
- Description:
- Fluid injection is one of the major triggering factors of infrastructure collapse and geo-hazards, among which some of the most recurrent ones are rainfall-induced landslides. Such events exhibit complicated spatiotemporal patterns, spanning from slow deformation to extremely rapid movements influencing large regions. To prevent the occurrence of catastrophic failures and...
- Keyword:
- instability criteria, viscoplasticity, constitutive model, wetting-induced failure, unsaturated soil, and solid-fluid transition
- Subject:
- Civil engineering
- Creator:
- chen, yanni
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15183 and etdadmin_upload_754611
-
- Description:
- With connected vehicle generated (CVG) information, traffic stream parameters become straightforwardly quantifiable, enabling traffic state characterization and examination over a variety of operational conditions. Since the observation is independent of any spatial restrictions and unaffected by queue buildup and discharge, CVG data offer more comprehensive, more reliable inputs to the...
- Keyword:
- Connected Vehicles, High-Resolution Measures, Trajectory Analytics, Performance Assessment, Traffic Signal System, and Connected Signal
- Subject:
- Transportation and Civil engineering
- Creator:
- Ostojic, Marija
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_765215 and http://dissertations.umi.com/northwestern:15296
-
- Description:
- A hybrid multimodal mobility system aims to deliver mobility as a service by integrating a broad range of existing and emerging public transportation services. The appeal of a hybrid system is twofold. First, it can strike a better balance between cost and level of service (accessibility, efficiency etc.). Second, it...
- Keyword:
- Network design, Continuous approximation, Hybrid mobility system, and Public transit
- Subject:
- Transportation and Civil engineering
- Creator:
- Luo, Sida
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15206 and etdadmin_upload_758565
-
- Description:
- Soil-Machine Interaction (SMI) is ubiquitous on Earth and other planets. Over decades, ground-engaging equipment has been developed and widely used in various engineering applications, including civil construction, agriculture, terrestrial mobility, and even space exploration. However, systematic studies of SMI processes and the corresponding soil behavior are inadequate, which obstructs further...
- Keyword:
- Soil-machine interaction, Sand , Semi-analytical model , Experimental study , Particle image velocimetry analysis, and Sequential kinematic model
- Subject:
- Civil engineering
- Creator:
- Jin, Zhefei
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_797724 and http://dissertations.umi.com/northwestern:15486
-
- Description:
- Providing quality transit service to travelers is a constant challenge for transit agencies. The advent of fully-autonomous vehicles (AVs) and their inclusion in mobility service fleets may allow transit agencies to offer better service or reduce their own capital and operational costs. This study focuses on the problem of allocating...
- Keyword:
- public transit, autonomous vehicles, optimization, network modeling, and shared mobility
- Subject:
- Transportation, Civil engineering, and Urban planning
- Creator:
- Pinto, Helen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_796818 and http://dissertations.umi.com/northwestern:15474
-
Across Scales: An Examination of the Impacts of Turbulence and Mobile Bedforms on Hyporheic Exchange
- Description:
- In this dissertation, advances are made in understanding both the way hyporheic exchange impacts riverbed morphodynamics and the physical processes that lead to turbulent momentum transfer in the first few grains of riverbed sediments. In terms of physical advances in understanding the interplay between bedform movement and hyporheic exchange, we...
- Keyword:
- Hyporheic Exchange, LES, Flume Experiments, Turbulence, and Bedforms
- Subject:
- Environmental engineering, Mechanical engineering, and Civil engineering
- Creator:
- Dallmann, Jonathan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/28/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_819194 and http://dissertations.umi.com/northwestern:15572
-
- Description:
- Travel time is a key aspect of capturing and evaluating the operational performance and service quality of transportation systems, and travel time improvement is a common objective for travelers, service providers, transportation practitioners and agencies. However, the reliability of travel times, including the probability of unexpected delays, is an important...
- Keyword:
- algorithms, networks, travel time reliability, stochastic networks, routing, and path finding
- Subject:
- Transportation, Operations research, and Civil engineering
- Creator:
- Filipovska, Monika
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/02/2022
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_850853 and http://dissertations.umi.com/northwestern:15794
-
- Description:
- Over 10 billion tons of concrete are produced for the construction industry every year, making concrete the second most used substance on Earth, only surpassed by water. With such high importance as a building material, there is significant need for the ability to accurately model concrete behavior. As a quasi-brittle...
- Keyword:
- Lattice Discrete Particle Model, Concrete, Micromechanics, Dynamics, Numerical Models, and Size Effect
- Subject:
- Materials Science, Computational physics, and Civil engineering
- Creator:
- Troemner, Matthew
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_878306 and http://dissertations.umi.com/northwestern:15920
-
- Description:
- This thesis describes an exploratory project to develop a highly non-traditional approach to devise novel test methods for characterizing the properties of materials that are essential to the design of sustainable and resilient infrastructure, particularly naturally occurring materials such as soils and rocks. The central idea is that the material...
- Subject:
- Civil engineering
- Creator:
- Nally, Anastasia
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16010 and etdadmin_upload_898203
-
- Description:
- Urban Air Taxi (UAT) is the use case of passenger-carrying Urban Air Mobility (UAM) at its mature state, and it offers a ubiquitous on-demand (or nearly on-demand) per-seat service that moves passengers in urban or suburban areas using groundbreaking aircraft. However, the absence of a dominant electric vertical take-off and...
- Keyword:
- Short Repositioning Elimination, Urban Air Mobility (UAM), Real-time Fleet Operation, Urban Air Taxi, and Air Pooling
- Subject:
- Transportation and Civil engineering
- Creator:
- Ale Ahmad, Haleh Sadat
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15931 and etdadmin_upload_879342
-
- Description:
- Slow-moving landslides are common in mountainous area worldwide. Most of them mobilizes slowly over long periods of time, which causes continuous damage to proximal infrastructure and habitats. Most notably, some slow-moving landslides can experience catastrophic acceleration at some point in their life cycle, with potentially fatal consequences. It is therefore...
- Subject:
- Geotechnology and Civil engineering
- Creator:
- Li, Xiang
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 09/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_927309 and http://dissertations.umi.com/northwestern:16221
-
- Description:
- Granular materials consisting of discrete particles, are a pervasive material in nature and play a major role in disparate fields of science and technology. To control and manipulate the granular materials in engineering, enriching our understanding of their fundamental characteristics and mechanical behavior is crucial. In this context, one of...
- Keyword:
- Shape evolution, Grain morphology, Granular materials, and Particle crushing/crushability
- Subject:
- Civil engineering
- Creator:
- Seo, Dawa
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 09/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16194 and etdadmin_upload_924292
-
- Description:
- The COVID-19 pandemic disrupted the status quo of the telemobility landscape in the United States, forcing millions of Americans into lock down, significantly changing the way we work, travel, and spend our time and money for an extended period of time. After several months of adaptation, adoption, learning, and unlearning,...
- Keyword:
- latent variable modeling, e-commerce, covid-19, longitudinal tracking, telemobility, and telework
- Subject:
- Transportation and Civil engineering
- Creator:
- Tahlyan, Divyakant
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16722 and etdadmin_upload_1012495