Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 68 for “"Moment of Inertia"”.
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Floor Vibrations: Girder Effective Moment of Inertia and Cost Study
Studies on the effective moment of inertia of girders that support concrete slabs using joist seats as the horizontal shear connections, and a cost efficiency analysis comparing composite and non-composite floor systems that meet vibrations design standards, were conducted. The first study was …
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A Study Of Effective Moment of Inertia Models for Full-Scale Reinforced Concrete T-Beams Subjected to a Tandem-Axle Load Configuration
This thesis is a product of the U.S. Army Corp of Engineer's desire to develop a more accurate procedure for estimating the load capacity of an in-service T-beam bridge. A bridge type that is a stumbling block for U.S. Army field engineers due to the unknown amount and placement of the flexural …
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Equation of state of rotating neutron stars
In this thesis a very comprehensive model of rotating neutron stars has been constructed, which is based on the Quark-Meson Coupling model (QMC model), using the method developed by Hartle for slowly rotating compact stars. To determine tidal Love number method suggested by ’Hinderer’ is adopted. …
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Vibration and Flexural Strength Characteristics of Composite Castellated Beams
With the development of lightweight concrete and design optimizations, floor vibration problems are becoming a serious serviceability problem. The castellated beam is a prime example and was the focus of this study. The vibration and flexural strength performance were verified in this paper. The …
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Fundamental Natural Frequency of Steel Joist Supported Floors
… in determining the first natural frequency of steel joist supported floors were studied. The aspects are: 1) determining which finite element model best predict the behavior of joist-slab tee-beams, 2) investigating the ability of proposed equations to calculate the effective moment of …
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Vibration characteristics of joist and joist-girder members
With the development of lightweight steel beam and steel joist-concrete slab floor systems, floor vibration problems are becoming more and more prevalent. This paper presents the experimental and analytical study of the vibration characteristics of steel joist and joist-girder members. Three …
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Power hitting : finding the right implement
Striking a ball with an implement occurs often in sports. Athletes are given a large variety of options to choose from when they select their implements. The motivation for this study was the need for a simple method that athletes can use to choose the implement that will allow them to perform …
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Light gage steel folded plates
… pressure to determine the relative stiffness of this type of structure. Deflections at mid and quarter spans were measured and compared with values determined by a rational method of analysis. A different approach to the analysis was introduced in which values of equivalent moment of inertia …
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Investigation of several aspects of the vibration characteristics of steel member-supported floors
… influencing the vibration characteristics of steel member supported floors were investigated. The four aspects are: 1) the number of tee-beams effective in resisting a heel-drop impact for steel joist and steel beam-concrete slab floors, 2) the effective moment of inertia of steel joist and …
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Analysis of the Navier--Stokes-αβ equations
… estimates for the nodal distance and the number of determining modes. A method of averaging is developed and applied to derive a Kaman--Howarth type equation for the Navier--Stokes-αβ equations. Finally we investigate an anisotropic generalization of the Navier--Stokes-αβ equations. We show that …
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The Quantum Mechanical Hamiltonian of Rotating-Vibrating Polyatomic Molecules and an Exact Solution
… is obtained using well-established techniques of differential geometry. The difficulties and the ambiguities in the traditional approach to this problem--that of quantization--are then investigated. In this unified treatment of linear and nonlinear molecules, the reasons that previously have …
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Modelling of reinforced concrete slab deflections at service loading
… under service loading is an important aspect of reinforced concrete slab design. Under-design can cause large deflections which can be expensive to repair, if at all possible. Over-design can lead to material wastage and unnecessary dead load. Deflection is inversely proportional to the …
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A Study on the Feasibility of Using Fractional Differential Equations for Roll Damping Models
… has been developed to study the effectiveness of substituting time tested ODEs with FDEs as applied to ship motions, specifically with an eye toward modeling different forms of roll damping. Relations between the order of differentiation a and damping coefficient b in the FDEs have been drawn …
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Convergence characteristics of the fully stressed design method for plane frames
It is the intent of this paper to investigate how the convergence rate of a fully stressed design method using a stress-ratio algorithm may be affected by manipulating various parameters. The parameters studied are: (1) selection of a design variable, (2) relationships between the variables of …
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Unsteady aerodynamics of falling plates
We investigate the problem of falling paper by solving the two dimensional Navier-Stokes equations subject to the motion of a free falling body at Reynolds numbers around 10^3, which is typical for a leaf or business card falling in air, and experimentally, by using a quasi two dimensional set up …
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Impact of the Variable Weighted MOI Baseball Bat on Swing Velocity Enhancement
The sport of baseball is ubiquitous in American culture and has observed global prominence. Since its creation in the 1800s, individuals have sought to improve batting performance which is evident by the plethora of scientific literature that exists on the topic through today. Bat velocity is one …
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Spin dynamics of space stations under transient and steady-state excitations and stabilizing responses
An analytical study of the dynamics of manned rotating space stations under various steady-state and transient excitation, such as docking impacts, attitude system torques, and crew motions, has been conducted. The basic equations of motion for the spinning station are developed and expressions …
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Elastic buckling solutions for thin-walled metal columns with perforation patterns
… for use in predicting elastic buckling strength of cold-formed steel columns. These methods were developed by examining elemental behavior of cross-sections in eigen-buckling analyses and validated using a large database of finite element rack-type columns with perforation patterns. The influence …
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Static, dynamic and aeroelastic behaviour of thin-walled composite structures with application to aircraft wings
Theoretical and experimental investigations of the static and dynamic behaviour of thin-walled structures are carried out with the ultimate aim of improving prediction procedures for various aeroelastic phenomena. The dynamic stiffness matrix approach is used for structural idealization, while …
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Feasibility Study Of Evaluating Durability Of Cfrp-strengthened Beams Using In-situ Load Test
In Florida a number of highway bridges were retrofitted on their reinforced concrete (RC) girders with carbon-fiber reinforced polymers (CFRP) during the 1990's. Their conditions, after being in service for approximately 10 years, are of significant interest to the State's highway authority, as …
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