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Articles 1 - 30 of 41
Full-Text Articles in Engineering
Predicting Solute Transport In Natural Streams - A Stochastic Approach, Xueqing Zhou
Predicting Solute Transport In Natural Streams - A Stochastic Approach, Xueqing Zhou
Dissertations and Theses
The existing theories for predicting longitudinal dispersion in straight open channels have long been recognized as inadequate when applied to natural rivers. These theories tend to grossly underestimate dispersion in real streams since an important mixing mechanism due to nonuniform river cross-section variations is not explicitly taken into account. Recognizing the important role of stream irregularities on solute transport and the analytical difficulties of classical deterministic analysis, we develop a stochastic approach for analyzing solute transport in natural streams. Variations in river width and bed elevation are conveniently represented as one-dimensional random fields, characterized by their autocorrelation functions. Advection and …
Development Of A Highway Safety Management System For Indiana: Phase 1, Omar Farooq, Kumares C. Sinha, John Nagle, Dwayne Stanley James, Yi Jiang
Development Of A Highway Safety Management System For Indiana: Phase 1, Omar Farooq, Kumares C. Sinha, John Nagle, Dwayne Stanley James, Yi Jiang
JTRP Technical Reports
This report presents the work plan for the development of a highway safety management system for Indiana. It identifies major activities and responsibilities for the development and implementation of a formal, statewide, interactive safety decision-making process. The safety management system of Indiana is perceived as a continuous process of considering all opportunities to improve highway safety in all phases of highway planning, design, construction, maintenance and operation. The primary emphasis is on coordination of activities at various levels and on the development of a common information data base that can be used for selecting and implementing effective highway safety strategies …
Two Dimensional Finite Element Modeling Of Swift Delta Soil Nail Wall By "Abaqus", Richard James Barrows
Two Dimensional Finite Element Modeling Of Swift Delta Soil Nail Wall By "Abaqus", Richard James Barrows
Dissertations and Theses
Soil nail walls are a form of mechanical earth stabilization for cut situations. They consist of the introduction of passive inclusions (nails) into soil cut lifts. These nailed lifts are then tied together with a structural facing (usually shotcrete) . The wall lifts are constructed incrementally from the top of cut down. Soil nail walls are being recognized as having potential for large cost savings over other alternatives. The increasing need to provide high capacity roadways in restricted rights of way under structures such as bridges will require increasing use of techniques such as combined soil nail and piling walls. …
The Influence Of Hydrodynamics And Particle Size On The Rejection Properties Of Ultrafiltration Membranes, Usama M. Shahin
The Influence Of Hydrodynamics And Particle Size On The Rejection Properties Of Ultrafiltration Membranes, Usama M. Shahin
Theses
A mathematical model based on the flow hydrodynamics is developed to calculate the treatment efficiency of ultrafiltration process. This model relates the treatment efficiency with the consideration of both fixed parameters and variable parameters. The fixed parameters are function of the intrinsic rejection coefficient, diffusion coefficient, and viscosity whereas the variable parameters can be related to the fluid velocity, volume flux, and cartridge dimensions. The model has been examined by solutions with solutes that have different molecular weights. The experimental data fits the proposed mathematical model very closely suggesting its suitability to evaluate the rejection efficiency in ultrafiltration. As such …
Behavior Of Concrete And Slender Reinforced Concrete Columns Under Cyclic Axial Compression With Bidirectional Eccentricities, Byong Youl Bahn
Behavior Of Concrete And Slender Reinforced Concrete Columns Under Cyclic Axial Compression With Bidirectional Eccentricities, Byong Youl Bahn
Dissertations
A rational analysis of reinforced concrete (R/C) structures requires satisfactory modeling of the behavior of concrete under general loading patterns. The behavioral characteristics of concrete dominantly depends upon its load history. For the study of concrete behavior, parametric study and experimental investigation into the behavior of concrete under load history of random cycles are performed. Through parametric study, the applicability of the previous concrete models is examined and a physically motivated modeling for the cyclic stress-strain relationships is proposed. The present modeling of concrete under general cyclic loading is initiated to provide substantial applicability, flexibility of mathematical expressions and furthermore …
Theoretical Evaluation Of The Break Off Test For Concrete, Arjuna Priyara Ranasinghe
Theoretical Evaluation Of The Break Off Test For Concrete, Arjuna Priyara Ranasinghe
Dissertations
Strength of concrete is normally measured using the standard cylinder or cube. The measured strength is used for design. The accuracy of concrete strength is frequently challenged, particularly in large concrete structures where size effect of the test specimens is attributed for the differences. Many nondestructive tests were developed to evaluate concrete strengths. In recent years, it was obvious that these tests are unreliable. As the infrastructure decays, more nondestructive tests are required to evaluate the existing structures.
The Break Off Test is a recently developed nondestructive test. Although substantial amount of experimental investigations have been carried out on this …
Evaluation Of The Edge Strength Of Architectural Glass, Kevin L. Alexander
Evaluation Of The Edge Strength Of Architectural Glass, Kevin L. Alexander
Opportunities for Undergraduate Research Experience Program (OURE)
A mechanical device to test the edge strength of glass was developed in a previous study and was to be modified for more accurate results in this study. The mechanical apparatus allows for a load to be applied and directed along one diagonal of a glass beam making the other diagonal the neutral axis. This allows only one edge to be in tension where the failure is desired.
This study evaluated the scored edge lines and the other edge lines of annealed glass which was cut by an experienced glass cutter with a steel scoring wheel, and a carbide scoring …
Institutional Issues Related To The Application Of Intelligent Vehicle Highway Systems Technologies To Commercial Vehicle Operations In Indiana, James G. Kavalaris, Kumares C. Sinha
Institutional Issues Related To The Application Of Intelligent Vehicle Highway Systems Technologies To Commercial Vehicle Operations In Indiana, James G. Kavalaris, Kumares C. Sinha
JTRP Technical Reports
The study focused on potential barriers and opportunities to implementing Intelligent Vehicle-Highway System (IVHS) technologies to Commercial Vehicle Operations (CVO) in Indiana. Specific concepts included: (1) Automatic payment of tolls while driving at mainline speeds; (2) Pre-Clearance of vehicles and drivers past weigh stations; (3) "One-Stop-Shopping" for licenses, registrations, and permits; and (4) Transparent state borders. The study reviewed existing laws and policies applying to commercial vehicles operating in Indiana; prepared an inventory of the agencies responsible, their existing procedures, their physical facilities, and their human resources used to implement these regulations; itemized present impediments preventing the implementation of IVHS-CVO …
Behavior Of Biaxially Loaded Concrete-Encased Composite Columns, Pedro Ricardo Munoz
Behavior Of Biaxially Loaded Concrete-Encased Composite Columns, Pedro Ricardo Munoz
Dissertations
The theory of nonlinear behavior of biaxially loaded short and slender composite columns is used to study the load-deformation and moment-curvature of four pin-ended composite column specimens tested under axial compressive load and biaxial bending moments in a single curvature. The accuracy of the test results is verified by comparison with analytical results obtained by a method of analysis that includes the nonlinear material properties of concrete and steel and covers the ascending and descending branches of the linear segmented column specimen. A computational method is presented to model the analytical behavior of the biaxially loaded composite column. Its validity …
Design, Construction, Calibration And Applications Of An Apparatus Which Conducts The Large Missle Impact Test, John Schroeder
Design, Construction, Calibration And Applications Of An Apparatus Which Conducts The Large Missle Impact Test, John Schroeder
Opportunities for Undergraduate Research Experience Program (OURE)
Prior to Hurricane Andrew (August 1992), the South Florida Building Code maintained provisions for the design of building openings based on wind pressure only. Hurricane Andrew provided evidence of other failure modes, including windborne debris and internal pressure. Following the hurricane, several changes were made to building codes in South Florida. One addition requires building openings to resist windborne debris. A missile impact test incorporated into recently accepted Dade and Broward Counties editions of the South Florida Building Code states a window, door, or external protection device shall resist a prescribed number of impacts from a nine pound 2x4 timber …
Design, Construction, And Operation Of Water Treatment Plant Residual Monofills, Haitao Bian
Design, Construction, And Operation Of Water Treatment Plant Residual Monofills, Haitao Bian
Theses
Due to the stringent environmental regulations, landfilling becomes the most viable option for ultimate disposal of water treatment plant (WTP) residues. At present, most states apply the regulations for municipal solid waste (MSW) landfills to the landfilling of WTP residues. This is too stringent since the WTP residues are not hazardous. Therefore, development of suitable criteria for WTP residual monofills is necessary and urgent.
A set of environmental and geotechnical experiments was conducted to characterize WTP residues. It can be concluded that very little leachate will be produced and migration of leachate is unlikely. Also it was noted that insignificant …
Geotechnical Characterization Of Water Treatment Plant Residuals, Zhengyuan Xia
Geotechnical Characterization Of Water Treatment Plant Residuals, Zhengyuan Xia
Theses
Evaluation of engineering properties of water treatment plant (WTP) residuals is a critical part in predicting their behaviors in monofills. In this study, ten WTP residual samples were collected from ten water treatment plants across the United States. Their general chemical/physical and geotechnical properties including liquid and plastic limits, compaction) shear strength, permeability and durability characteristics were determined.
It was observed that the geotechnical properties of WTP residuals are influenced by various factors such as mineral particle composition, organic content, type and amount of chemical additives) and time of aging, etc. Based on this study, the behavior of WTP residual …
Concrete Beam Design Optimization With Genetic Algorithms, Siripong Malasri, D. A. Halijan, M. L. Keough
Concrete Beam Design Optimization With Genetic Algorithms, Siripong Malasri, D. A. Halijan, M. L. Keough
Journal of the Arkansas Academy of Science
This paper demonstrates an application of the natural selection process to the design of structural members. Reinforced concrete beam design is used as the example to show how various chromosomes representing a design solution can be formulated. Fitter chromosomes (or better solutions) have a better chance of being selected for cross over; this in turn creates better generations. Random mutation is used to enhance the diversity of the population. The evolution progresses through several generations, and the best solution is then used in the design. The method gives reasonable results, but sometimes a local (as opposed to the global) optimized …
Estimation Of Resilient Modulus Of Fine-Grained Subgrade Soils, David Newton Richardson
Estimation Of Resilient Modulus Of Fine-Grained Subgrade Soils, David Newton Richardson
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Determination Of Aashto Layer Coefficients For Granular Materials By Use Of Resilient Modulus, David Newton Richardson
Determination Of Aashto Layer Coefficients For Granular Materials By Use Of Resilient Modulus, David Newton Richardson
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The layer coefficients a2 or a3 for an unbound granular base or subbase material are found from a relationship with resilient modulus, Eb. The resilient modulus for a given material can be found by test using the "theta model" or by use of an estimation regression equation. Eb is a function of several factors, as discussed below.
Development Of A Strategy For Compliance With Epa And Osha Regulation Application To Indot Facilities, Lynn A. Corson
Development Of A Strategy For Compliance With Epa And Osha Regulation Application To Indot Facilities, Lynn A. Corson
JTRP Technical Reports
Between March 1990 and November 1992, a sample of 27 field and support facilities operated by the Indiana Department of Transportation were visited by staff of the Environmental Management and education Program, School of Civil Engineering, Purdue University, for the purpose of conducting workplace assessments to ascertain the department’s compliance with federal and state environmental and worker protection regulations. Thirty-eight different department operations and nine different employee functions were observed and analyzed. There were compliance areas at every facility visited which needed strengthening. A total of 222 recommendations for strengthening those areas are included in the research report. The department …
Multimedia Application Synthesis Study, Bob G. Mccullouch
Multimedia Application Synthesis Study, Bob G. Mccullouch
JTRP Technical Reports
Multimedia with its ability to involve various human faculties through the use of various media forms, provides a robust environment in which to learn in. Retention improves significantly when media exercises these various human faculties. Studies indicate that students complete training in one-third the time of the traditional instruction method while reaching up to 50 percent higher competency levels. Utilizing this technology can provide improved training tools and learning environments for the Department. Because of the many potential applications, technical and nontechnical, that may exist within the Department for utilizing this technology; a study was performed to answer questions about …
An Evaluation Of The Strategic Highway Research Project Packing Handbook, Kenneth P. Cox, Charles F. Scholer, Menashi D. Cohen
An Evaluation Of The Strategic Highway Research Project Packing Handbook, Kenneth P. Cox, Charles F. Scholer, Menashi D. Cohen
JTRP Technical Reports
The objective of this research is to evaluate the use of the November 8, 1991 SHRP C-206 report entitled, “Packing Handbook – A Guide to the Optimal Gradation of Concrete Aggregates”. The purpose of the Packing Handbook is to determine the optimal combination of fine and coarse aggregates for concrete from available aggregate sources. Through the use of tables provided in the Packing Handbook, and given sources with known aggregate gradations and void contents, the relative proportion of each aggregate (coarse and fine) is obtained. Concretes made using the Packing Handbook recommendations of aggregate proportioning were compared to concretes used …
Guidelines For Permitting Overloads; Part 1: Effect Of Overloaded Vehicles On The Indiana Highway Network, Sameh Mohamed Zaghloul, Thomas D. White
Guidelines For Permitting Overloads; Part 1: Effect Of Overloaded Vehicles On The Indiana Highway Network, Sameh Mohamed Zaghloul, Thomas D. White
JTRP Technical Reports
Closed form analysis is commonly used to analyze pavement structures. This type of analysis assumes linear elastic material properties and static loading conditions. In reality, pavement materials are not linear elastic materials. For example, asphalt mixtures are viscoelastic materials and cohesive soils are elastic-plastic materials. Also truck loads are moving loads. The difference between the closed form analysis assumptions and the actual pavement conditions leads to significant differences between measured and predicted pavement response. A study has been conducted at Purdue University to develop a procedure for permitting overloaded trucks in Indiana. This study was funded by the Indiana Department …