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Siphon Removal Of Cohesionless Materials., Syeed Mahbub. Ullah
Siphon Removal Of Cohesionless Materials., Syeed Mahbub. Ullah
Electronic Theses and Dissertations
This thesis discusses the removal of cohesionless sediments by siphoning. A significant part of this study involves the analysis of equilibrium scour hole dimensions under different siphon flow characteristics. Scour holes of the sediments were formed by a siphon tube of three different sizes (9.65, 13.86 and 20.4 mm) positioned vertically at different positions relative to the surface of the sand bed. A total of 174 tests were performed, where the position of the tube ranged from 101.6 mm below the original bed to 6.4 mm above it. The latter part of the study investigates the heights for critical and …
Nonlinear Deformations Of Laterally Loaded Piles Embedded In Stiff Clay Located Below The Water Table: Sensitivity Analysis., Deddy. Suwarno
Nonlinear Deformations Of Laterally Loaded Piles Embedded In Stiff Clay Located Below The Water Table: Sensitivity Analysis., Deddy. Suwarno
Electronic Theses and Dissertations
Sensitivity analysis is one of the methods predicting how sensitive a soil-pile interactive system will behave under a lateral loading, whether a horizontal force or a bending moment, due to the changes of the design variables. For a civil engineer, it is important to know what is the deformation at the top of the pile foundation to be considered for the upper structure. Therefore, the sensitivity analysis in this thesis focuses on the changes of the displacement and the angle of flexural rotation at the top of the pile due to the changes of the design variables which are the …
High-Performance Mortar Reinforced With Short Carbon Fibers., Md. Safiuddin
High-Performance Mortar Reinforced With Short Carbon Fibers., Md. Safiuddin
Electronic Theses and Dissertations
The aim of the work reported in this thesis was to evaluate the performance of carbon fiber reinforced mortar in respect of workability, strength, impact resistance, toughness, durability, and cost-effectiveness. Laboratory experiments were carried out to investigate the properties of both fresh and hardened mortars reinforced with short carbon fibers and to optimize the mix with sufficient workability, good strength, superior impact resistance, enhanced toughness, and excellent durability at reasonable cost. Experimental investigation was carried out at the Concrete Laboratory of the University of Windsor. Five different types of mortar were taken under study including the control mortar based on …
Strength Of Bolted Ring-Type Connections Of Solid Round Leg Members Of Guyed Communication Towers., Lihong. Shen
Strength Of Bolted Ring-Type Connections Of Solid Round Leg Members Of Guyed Communication Towers., Lihong. Shen
Electronic Theses and Dissertations
The objective of the investigation is to study the strength of bolted ring-type connections used for solid-round leg members of all-welded steel towers subjected to tensile loads and to determine whether the current practice of ignoring the eccentricity of the connection can be justified or not. The load carrying capacity and maximum gap were determined experimentally and by finite element analysis. A total of eighteen specimens divided into three groups were tested. Group 1 consisted of six specimens of 25.4 mm (1.0 in.) leg size and 22.2 mm (7/8 in.) bolt size with no girls, group 2 consisted of six …
Strengthening Of Reinforced Concrete Beams Using Innovative Ductile Composite Fiber-Reinforced Polymer Systems., Wael Fathy. Ragheb
Strengthening Of Reinforced Concrete Beams Using Innovative Ductile Composite Fiber-Reinforced Polymer Systems., Wael Fathy. Ragheb
Electronic Theses and Dissertations
Although the technique of external strengthening of reinforced concrete beams using externally bonded Fiber Reinforced Polymer (FRP) materials has been established as an effective tool for rehabilitating and strengthening reinforced concrete beams, it is still suffering from some drawbacks. A significant part of these drawbacks is attributed to the characteristics of currently available FRP strengthening systems. This study deals with the development and evaluation of the effectiveness of two innovative ductile FRP systems for flexural/shear strengthening of reinforced concrete beams. The systems are fabrics that are hybrid of glass and carbon fibers and designed to have the potential to avoid …
Analysis Of Circular Geogrid-Reinforced Soil-Steel Bridge., Andre John Kendall. Bom
Analysis Of Circular Geogrid-Reinforced Soil-Steel Bridge., Andre John Kendall. Bom
Electronic Theses and Dissertations
A finite element analysis, by means of ABAQUS, has been undertaken to study the effects of inserting geogrid layers in the soil cover of a circular soil-steel bridge with a diameter of 7.6 m. Two loads are applied to the soil-steel bridge: gravity, as well as a truck load defined by the Canadian Highway Bridge Design Code design truck. Because experimentation and design of geogrids involve the application of a strip load, it is necessary to apply a strip load at the soil surface. Therefore, the rear two axles of the truck, separated by 1.2 m, are the largest loads …
Submergence Effects On Local Scour., Md Rajib. Ahsan
Submergence Effects On Local Scour., Md Rajib. Ahsan
Electronic Theses and Dissertations
The study discussed herein focuses on the local scour created in a cohesionless sand bed by a plane turbulent wall jet with varying levels of submergence from 1 to 20. From the observations of 40 experiments the study reveals that the formation of unstable scour processes, which can be short and long-term in nature, depends on the water depth available above the mound apex for a given initial jet velocity. In case of stable scour process, the growth of the scour hole dimensions follows a linear relation with the logarithm of time beyond which the rate of change in the …
Identification Of Dynamic Characteristics Of Linear Systems., Md. Mizanur Rahman
Identification Of Dynamic Characteristics Of Linear Systems., Md. Mizanur Rahman
Electronic Theses and Dissertations
Structures, built in active earthquake zones, can be subjected to damaging dynamic loading. The health monitoring process for these structures is essential. When a structure is submitted to repetitive moderate earthquake events, it is expected to accumulate certain damage. The variation of the dynamic characteristics can be an indicator of the damage extension in a structure. The procedure of evaluating the dynamic characteristics of a structure is referred to as system identification. This investigation focuses on the analysis of different techniques for identifying linear structures with available recorded responses during earthquake events. These approaches are: (i) Fourier transform approach; (ii) …
Implementation Of The Maturity Method Into Precast Concrete Applications., Alvin. Olar
Implementation Of The Maturity Method Into Precast Concrete Applications., Alvin. Olar
Electronic Theses and Dissertations
The personnel at Prestressed Systems Incorporated (PSI) suspected that use of the zero slump test cylinders to measure the compressive strength of hollowcore concrete was not reliable. If a test cylinder failed only by a chipped edge while being tested for compressive strength, it was not useful for determining the time at which the prestressing force in the tendons can be transferred into the bed of hollowcore. A more reliable method was sought to quantify the compressive strength of zero slump concrete at the time of tendon release. The method should also provide real-time information on the progress of concrete …
Dynamic Analysis Of Structures With Uncertain Properties., Sudhan Sampad. Banik
Dynamic Analysis Of Structures With Uncertain Properties., Sudhan Sampad. Banik
Electronic Theses and Dissertations
The properties of engineering structures are variable by nature. This variation affects considerably the dynamic response of structures and this is overlooked in traditional deterministic analysis. The incorporation of statistical variability of structural properties in analysis has been a topic of considerable research for the last thirty years. The determination of statistical measures of a desired response variable, such as the natural frequencies, maximum displacement, or stresses has been a primary goal of this study. The objective of this research work is to determine the quantitative effect of uncertainties on the dynamic response of a structure with uncertain parameters through …
Piles Embedded In Soft Clay Located Below The Water Table Subjected To Lateral Cyclic Loadings: Sensitivity Analysis., Deni Gunawan. Priyanto Putro
Piles Embedded In Soft Clay Located Below The Water Table Subjected To Lateral Cyclic Loadings: Sensitivity Analysis., Deni Gunawan. Priyanto Putro
Electronic Theses and Dissertations
This study presents the theoretical formulation and numerical investigations of sensitivity analysis of laterally loaded piles embedded in soft clay located below the water table. Single piles with various lengths and boundaries subjected to cyclic lateral forces and bending moments are analyzed. The groups of 3 x 3 piles with various spacing (2D, 3D, 4D, and 5D) are also analyzed in this study. For single piles, the pile structure is considered as one-dimensional beam and the supporting soft clay is defined by means of p-y model. For groups of piles, the pile members are considered as one-dimensional beams and the …
Laboratory Study And Numerical Simulation Of Permanganate Oxidation Of Pooled Tetrachloroethylene., Qunli Dai
Laboratory Study And Numerical Simulation Of Permanganate Oxidation Of Pooled Tetrachloroethylene., Qunli Dai
Electronic Theses and Dissertations
The main objectives of this research are to evaluate MnO2 plugging effects on remedial efficiency of pooled tetrachloroethylene (PCE) using KMnO4 solution under a high pH condition, to develop and test a three-dimensional numerical model, and to validate the model with experimental data. Additional studies conducted to achieve the thesis objectives include kinetic studies of KMnO4 oxidation with PCE at high pH. The kinetic studies of KMnO4 oxidation of PCE were conducted using a sodium carbonate solution (1 g/l, pH = 10.6 +/- 0.1) at three different temperatures (5, 10, and 20°C) and three KMnO4 concentrations (0.2, 1, and 5 …
Flexural Strength Of Circular Monopole Flange Connections., Venisri. Nagulapati
Flexural Strength Of Circular Monopole Flange Connections., Venisri. Nagulapati
Electronic Theses and Dissertations
This investigation focuses on the flexural strength of circular flange connections in monopoles with particular attention to the role of stiffeners. Four finite element models---(a) 25.4 mm thick flange unstiffened connection, (b) 25.4 mm thick flange stiffened connection, (c) 19.1 mm thick flange unstiffened connection and (d) 19.1 mm thick flange stiffened connection, with eight 25.4 mm diameter bolts for each connection, were developed. The finite element models were validated by comparing the finite element failure loads, deflections and strains with experimental values. Five test specimens were 25.4 mm thick stiffened flange connections (with different orientations of stiffeners), three test …