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Approximate Methods For Analysis And Design Of Channel And Tee Shaped Reinforced Concrete Columns Under Axial Compression And Biaxial Bending, Chayan Bhattacharyya

Theses

Combined Bending and Axial Compression for irregular shaped (such as L-shaped, Channel shaped, T-shaped) reinforced concrete short column is a common design problem. Current code provisions and the available design aids do not offer an insight into the determination of strength and ductility of biaxially loaded reinforced concrete columns. The reason is that the information on the behavior of irregular shaped reinforced concrete members under combined biaxial bending and axial load is not well known. They are usually overdesigned and this may cause the structure to be stiffer, which may result in loss ductility when applied to seismic regions. Thus …

Application Of Computer Techniques In Groundwater Contamination Studies, Komratchi Raman

Theses

A study has been undertaken to provide insight into two related aspects of groundwater contamination studies - contaminant transport behavior and its analysis by modeling techniques. The study reviews recent research that explains some of the uncertainties in the transport and fate of chemical contaminants in groundwater. Approaches to modeling techniques and data reduction are developed to illustrate their usefulness in analysing existing groundwater data, and to make predictions on the future water chemical characteristics. Three types of study areas have been chosen for this purpose, each representing a different type of groundwater contamination problem. The first study area has …

Traffic Volume Estimates And Growth Trends, John A. Deacon, Jerry G. Pigman, Ahmad Mohsenzadeh

Kentucky Transportation Center Research Report

The objective of this study was to develop a procedure to forecast highway traffic volumes through the use of growth factors representative of Kentucky highways and reflecting effects of important socioeconomic and demographic variables. A two-stage modeling process was used. In the first, linear regression models were used to relate average daily travel on Kentucky roadways to personal income, price of fuel, and total miles of streets and highways. In the second, cross-tabulation models were used to relate growth in volume at a specific site--expressed relative to the statewide ADT--to highway functional classification rural/urban location, county population growth, SMSA/non-SMSA designation, …

Modifications To Chevron N-Layer Computer Program, Herbert F. Southgate, Robert C. Deen, David Cain, Jesse G. Mayes

Kentucky Transportation Center Research Report

This report documents changes made to the Chevron N-layer computer program to:

1. Include superposition principles.
2. Calculate strain energy density (or work) at specified locations within the pavement structure.
3. Analyze pavement response at specified radii from one circularly loaded area to permit comparison of analyses by the program as originally written with results incorporating superposition principles.
4. Evaluate pavement response to any combination of loads on circular areas defined by XY coordinates on the surface. Loads and contact pressures are permitted to be different from one loaded area to another, but must be constant for any one loaded area.
5. Simulate dynamic loads …

Pavement Designs Based On Work, Herbert F. Southgate, Robert C. Deen

Kentucky Transportation Center Research Report

Thickness design curves presented in the report provide a systematic methodology for the selection of equivalent pavement designs for a broad range of layered systems. This is a unified system since the failure criteria are founded on the same concept of work strain and work. The analyses of stress-strain fields in the layered systems are based on elastic layered theory. This theory is represented by the Chevron N-layered computer program.

The report also summarizes the historical development and evolution of pavement design in Kentucky.

Effects Of Hysteresis With Air Entrapment On Water Flow In The Unsaturated Zone, Jagath J. Kaluarachchi, J. C. Parker

Civil and Environmental Engineering Faculty Publications

Effects of hysteresis with air entrapment on water content and head distributions, surface fluxes, and water balance components are investigated by finite element simulations of flow in one- and two-dimensional spatial domains. Results of one-dimensional analyses indicate that effects of hysteresis are markedly influenced by surface boundary conditions and to a lesser extent by initial conditions. Stipulation of flux-controlled boundary conditions results in minimal hysteretic effects, while potential-type boundary conditions produce substantial deviations between hysteretic and nonhysteretic simulations. The latter effects are attributable in large part to differences in surface conductivity associated with air entrapment. Predicted water content distributions for …

Computer-Aided Analysis And Design Of Rectangular Buried Tank Walls And Its Safety Factor Evaluation Based On Yield Line Analysis, Rakiya J. Fatoohi

Civil & Environmental Engineering Theses & Dissertations

This thesis presents the results of a study that determines the true safety factor of underground square reinforced concrete tank walls.

The walls are analyzed and designed by elastic method. The amount and distribution of the reinforcement was determined by use of the alternate design method (working stress) in compliance with all ACI code requirements. The wall's ultimate moment was computed by use of yield line theory assuming non-isotropic reinforcement. The ultimate value of the earth pressure was computed and compared with the elastic analysis and design values to give the true safety factor.

The results of this study indicate …

Degradation Of Aniline And Nitrobenzene In A Photoreactor, Michael Joseph Sowa

Theses

Degradation of aniline and nitrobenzene in aqueuous solutions was studied. Five reaction processes were utilized, including ultraviolet light, ozone, O₂/UV, O₃/O₂/UV, and H₂O₂/UV. A 30 liter semi-batch gas sparged reactor was used for the development of reaction rate and mass transfer parameters in these systems. The results were used to model a continuous stirred tank reactor (CSTR) for the O₃/O₂/UV case. Reasonable agreement was obtained for steady state exit concentrations between the experimental data and those predicted from the model.

Post-Cracking And Nonlinear Microcomputer Analysis In Reinforced Concrete Beams, Pedro Ricardo Munoz Arias

Theses

The main objective of this Thesis work is to study a non-linear behavior of reinforced concrete structures using the Finite Element Method and an incremental load strategy.

Bond between steel and concrete is simulated using linkage spring elements. The proposed model has a generalized crack propagation capability and it accounts for nonlinearities due to cracking and material properties.

Load-displacement relationships describing the aggregate interlock along the crack and the dowel action at the level of reinforcement are incorporated into a computer program.

A simply supported reinforced concrete beam is analyzed from zero load until failure. Contributions to the shear capacity …

Structural Sensitivity Analysis On A Parallel Computer, Niu Kian Teck

Civil & Environmental Engineering Theses & Dissertations

Substructuring formulation using adjoint variable approach has been developed for design sensitivity analysis and optimization of large scale structures. In this study, the procedure for statics and sensitivity analysis are re-examined to propose a programming scheme which can be implemented either in a sequential or parallel environment. The computational times of the substructuring formulation using a single processor versus multi-processors are compared to see the effectiveness of the formulation in the concurrent computing environment.

Computational Aspects Of Chance‑Constrained Regional Modeling, R. R.A. Cantiller, Richard C. Peralta

Civil and Environmental Engineering Faculty Publications

A methodology that incorporates the stochasticity of an aquifer parameter in a chance-constrained steady-state groundwater management model is presented. Results and computational aspects of the modeling effort are discussed.

Expert Potentiometric Surface Modification For Groundwater Contaminant Management, R. L. Ward, Richard C. Peralta, J. R. Brashar

Civil and Environmental Engineering Faculty Publications

An expert system is linked to an previously reported optimization program. The expert system prompts the user for information about a groundwater contamination problem. The expert system determines whether pumping is a suitable containment strategy. If appropriate. it selects several well arrangements to be evaluated by an optimization algorithm.

Expanding The Automated Centralized Control System At The Des Moines Area Community College, Mark David Baethke

Graduate Research Papers

DMACC currently has over $1,200,000 invested in the ACCS which is connected to 21 campus buildings. The ACCS is used to save an estimated $300,000 per year in energy costs through energy conserving control of heating, ventilating, and air conditioning equipment. The ACCS also improves building life safety functions through fire alarm monitoring and serves as a significant trouble shooting tool for the mechanical maintenance staff. The initial installations of the ACCS were done after lengthly audits and studies by professional consulting firms which resulted in the recommendations for installation and expansion. These studies were limited to only a few …

Integrating Water Quality Objectives With Traditional Water Rights In California: The Sacramento–San Joaquin Delta Case, Ronald B. Robie

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

14 pages (includes 1 map).

The Homestake Project & Water Quality Issues, Tad Foster

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

5 pages (includes 1 map).

Conflicts Between Water Rights Administration And Water Quality Protection, Jan D. Laitos

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

43 pages.

Reconciling Large-Scale Water Development And Water Quality Effects, James S. Sanderson

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

6 pages.

Wetlands Protection: The 404 Program, Patrick A. Parenteau

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

13 pages.

Includes unsigned annotations by David Getches.

The Clean Water Act, Water Quality, And Water Use, Bruce D. Ray

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

56 pages.

Includes unsigned annotations by David Getches.

Public Interest Review Of Water Right Allocation And Transfer In The West: Recognition Of Public Values, Douglas L. Grant

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

37 pages.

Contains references.

New Developments In Water Rights On Public Lands: Federal Rights And State Interests, Christopher H. Meyer

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

25 pages.

Contains footnotes and 2 pages of references.

State Water Planning To Protect Public Needs, David H. Getches

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

44 pages.

Nurturing Public Values In The Water Resource—The Montana Way, Matthew W. Williams

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

21 pages.

Contains references.

Emerging Policy And Strategy Choices For Protection Of The Groundwater Resource, Richard H. Braun

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

22 pages.

Contains 2 pages of references.

Instream Flow Protection In The Western States: A Survey And Comparison, Brian E. Gray

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

32 pages.

Contains references.

Federal Regulatory Rights In Water, Lawrence J. Macdonnell

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

29 pages.

Contains 1 page of references.

Converting Conditional Water Rights To Instream Flow Protection: A Property Transfer Strategy, David L. Harrison

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

64 pages.

Contains references.

Water As A Public Resource: The Legal Basis, Charles F. Wilkinson

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

37 pages.

Contains 2 pages of references.

Includes unsigned annotations by David Getches.

Public Access To Shorelines And Beaches: Alternative Approaches And The Taking Issue, Richard Hildreth

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

50 pages.

The Use Of “Nonnavigable” Water For Public Purposes, John E. Thorson

Water as a Public Resource: Emerging Rights and Obligations (Summer Conference, June 1-3)

18 pages.

Contains references.