Civil and Environmental Engineering Commons^™

Simplified Structural Analysis Of Framed Ordinary Non-Tempered Glass Panels During Fire Exposure, Amer Sabsabi, Maged A. Youssef, Salah El-Din F. El-Fitiany, Ajitanshu Vedrtnam

Civil and Environmental Engineering Publications

Ordinary non-tempered glass is one of the most widely used materials in the construction industry. Knowing its fire resistance is essential to ensure the safety of emergency personnel as its failure increases the oxygen supply and causes a rapid spread of the fire (flashover phenomenon). Existing approaches for evaluating the structural fire safety of glass façades require expensive experimental tests and/or extensive knowledge of Finite Element modeling. This paper provides a simplified, rational, and reliable approach to assess the structural capacity of ordinary glass panels during fire exposure. A simplified method is developed to predict the temperature difference between …

In-Situ Fluid Injections To Achieve Bio-Stimulated Calcite Precipitation In Expansive Soils, Anish Pathak

Boise State University Theses and Dissertations

Expansive soils undergo vast changes in volume when subject to change in water contents and cause damages to infrastructures across the world. Traditional methods of tackling the problem of expansive soils using cement or lime are environmentally unfriendly and expensive. Microbial Induced Calcite Precipitation (MICP) is a new method which uses bacteria in the soil to precipitate CaCO3 (calcite) and improve the engineering properties of soils. Various laboratory studies have shown that this method can be applied successfully to treat expansive soils, but the field application of the method have barely been studied.

To study the applicability of MICP in …

Design Upgrade For The Hybrid Glulam-Steel Roof Structure Of The Sports Hall For The New High School In Graçanica, Bledian Nela

UBT International Conference

This paper presents the design upgrade of the roof structure for a sports hall which consists of coupled glulam beams with steel substructure. The initial design has foreseen main glulam beams which are coupled with steel trusses and strengthened with rigid steel bars over the entire length. Due to some construction issues and design misinterpretation, the as-built structure did not follow completely the design and reinforcement rebars have been used instead of steel bars intended to be acting as steel ties. A design upgrade was required to preserve the main structure of the roof established with glulam beams, purlins and …

Civil Engineering Research In Ireland 2020: Conference Proceedings, Kieran Ruane, Vesna Jaksic, Bidisha Ghosh, Magdalena Hajdukiewicz, Ciaran Hanley, Niall Holmes, Jennifer Keenahan, Zili Li, Patrick Mcgetrick, Ted Mckenna, Mary Moloney, Vikram Pakrashi, Niamh Power

Books

Civil Engineering Research in Ireland 2020: Conference Proceedings.

High Strain Dynamic Test On Helical Piles: Analytical And Numerical Investigations, Mohammed Fahad Alwalan

Electronic Thesis and Dissertation Repository

Helical piles are currently considered a preferred foundation option in a wide range of engineering projects to provide high compressive and uplift resistance to static and dynamic loads. In view of the large capacity of large diameter helical piles, there is a need to determine their capacity using accurate and economically feasible testing techniques. The capacity of piles is usually determined by conducting a Static Load Test (SLT). However, the SLT can be costly and time consuming, especially for large capacity piles. The High Strain Dynamic Load Test (HSDT) evaluates the pile capacity using dynamic measurements generated through subjecting the …

The Development And Numerical Modelling Of A Representative Elemental Volume For Packed Sand, Ashraf Thabet

Electronic Thesis and Dissertation Repository

The motivation of this thesis is the development of simple microscopic-scale model (representative elemental volume; REV) that can be used to conduct flow and heat transfer simulations from which closure coefficients can be established for the volume-averaged transport equations for porous media (packed bed). The thesis provides a brief introduction to the computational technique adopted for the geometric generation of the REV (YADE), followed by a parametric study undertaken to reveal the minimum number of particles inside the REV that are required to mimic the appropriate physics. Additional analysis was conducted with the goal of determining the influence of deviation …

Combined Analysis Of Tide- And Wave-Induced Water Table Fluctuations For Structural Characterization Of A Coastal Aquifer, Victoria A. Trglavcnik

Electronic Thesis and Dissertation Repository

Understanding of coastal hydrogeology is essential for the assessment, management, and protection of coastal groundwater resources. Coastal groundwater is often an important source of drinking water for coastal communities but can be contaminated by saltwater or human-derived contaminants. The groundwater table in coastal aquifers fluctuates in response to various oceanic pressure forces acting at the shoreline, including tides, individual waves, and offshore storms. Measurements of water table fluctuations in response to tides and waves can be used to characterize coastal aquifers and provide important insight into the hydraulic properties and structure, including the connectivity between the aquifer and ocean. Most …

Starx Technology For Waste Oil Sludge Treatment Investigated With Numerical Modelling, Rebecca L. Solinger

Electronic Thesis and Dissertation Repository

Growing stockpiles of industrial liquid waste stored in lagoons are an outstanding problem worldwide. Self-sustaining Treatment for Active Remediation (STAR) is an emerging technology based on smouldering combustion that has been successfully deployed for in situ remediation of field sites (Grant et al., 2016). STAR is currently being developed as an ex situ treatment system (STARx) for industrial wastes by intentionally mixing them with sand. One engineering concept for STARx is the “hotpad”, for which some initial experiments have been conducted. However, a thorough experimental investigation is challenging due to the cost and time associated with each experiment. This work …

Aggregate Shape Effect On Multicomponent Ionic Electromigration In Concrete, Qing-Feng Liu, Long-Yuan Li, Jian Yang

International Conference on Durability of Concrete Structures

This paper presents a numerical study on the mechanism of chloride migration in concrete. Unlike most of existing work, this study utilises multicomponent ionic transport models to reflect the influence of ionic interactions by coupling both mass conservation and Poisson’s equations. A series of 2-D, 3-phase models with different shapes and volume fractions of aggregates are developed to simulate the chloride migration test. Through a comparatively overall numerical exploration that considers external voltage, ionic interactions, heterogeneous nature, ITZ, and ionic binding, some important features about multispecies coupling and aggregate shape effect, which have not been properly reported from existing concrete …

Behaviour Of Helical Pile Connectors For New Foundations, Muhammad Ahmad Muhammad Diab

Electronic Thesis and Dissertation Repository

Despite the wide application of the connections between slender pile types, which end with a mono steel bar at the ground level (e.g. helical piles and micro piles), and new reinforced concrete foundations with limited width (e.g. RC grade beams) in the piling industry in North America, neither a clear understanding of the connections' behaviour nor a specific design criteria for their implementation is presented.

The main goal of this research was to clearly understand the behaviour of these connections and their failure mechanism under monotonic and cyclic loadings. The research methodology involved conducting experimental tests on 33 full-scale pile-foundation …

Bedform-Induced Hyporheic Exchange: Impact Of Porous Medium Permeability, Carto Gualtieri

International Congress on Environmental Modelling and Software

Stream and pore waters continuously interact and mix within streambeds due to spatial and temporal variations in channel characteristics. This mixing is termed hyporheic exchange and the zone where groundwater and stream water are mixing is called the hyporheic zone, which can greatly affect water quality in both surface and subsurface water systems.

The paper presents some results of a numerical study carried out to investigate the influence of porous medium permeability on hyporheic exchange. Laminar flow in the water column above triangular bedforms and Darcian flow in the underlying permeable sediments were considered. Numerical simulations were carried out in …