Engineering Commons^™

The Structural Design Of Light Gauge Silo Hoppers, John Michael Rotter

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

Finite Element Model Of Nitrogen Species Transformation And Transport In The Unsaturated Zone, Jagath J. Kaluarachchi, J. C. Parker

Civil and Environmental Engineering Faculty Publications

A two-dimensional finite element model based on Galerkin's weighted residual approach and incorporating an upstream weighting technique was developed to predict the simultaneous transformation and transport of nitrogen species. The nitrogen cycle used in the analyses assumes first-order rate coefficients for nitrification, denitrification, immobilization and mineralization between the nitrogen species NH +4, NO -3, organic-N and denitrified fractions. The NO -3-N component in the soil solution was assumed to have negligible adsorption on exchange sites while adsorption of NH +4 was assumed to be represented by a Freundlich type nonlinear isotherm ( S = kdCp). The accuracy and validity of …

Irish Building Services News

Building Services Engineering

No abstract provided.

Load And Resistance Factor Design Of Cold-Formed Stainless Steel Statistical Analysis Of Material Properties And Development Of The Lrfd Provisions, Shin-Hua Lin, Wei-Wen Yu, Theodore V. Galambos

CCFSS Library (1939 - present)

INTRODUCTION 1.1 General Remarks The "Allowable Stress Design" method has long been used for the design of steel structures in the United States. 1,2,3 Recently, the probability-based load and resistance factor design (LRFD) criteria have been successfully applied to the structural design of hot-rolled steel shapes and built-up members. 4,5,6 The AISI LRFD Specification is being developed as well for the design of structural members cold-formed from carbon and low alloy steels. 7-17 These design criteria can provide a more uniform degree of structural safety to achieve consistent reliability for different design situations. The probability-based design method is developed on …

Impact Evaluation Of The Louisville-Shively-Jefferson County Traffic Alcohol Programs, Jerry G. Pigman, Kenneth R. Agent, Patricia L. Hardyman, Knowlton W. Johnson, Richard Mccleary

Kentucky Transportation Center Research Report

This report is an evaluation of alcohol enforcement programs conducted by the Louisville, Jefferson County, and Shively police agencies in the Louisville metropolitan area. The following four types of data were collected in order to evaluate the traffic alcohol programs; accident data, arrest and adjudication data, cost-effectiveness, and public opinion data.

Results from the before-and-after comparisons and time-series analysis show alcohol-related accidents decreased significantly during the study period, There was a 34.4 percent reduction in alcohol-related accidents during hours of special enforcement and a 30.4 percent reduction during all hours of the day. Time-series analysis of accident data showed a …

Fatigue Analysis Of The I-75 Bridge Over The Kentucky River At Clays Ferry, Theodore Hopwood Ii, Vishwas G. Oka

Kentucky Transportation Center Research Report

Fatigue analysis was performed on AASHTO category E welded connections on the southbound I 75 bridge over the Kentucky River at Clays Ferry, Kentucky. That analysis was based on the stress-range histogram data provided by Law Engineering of Louisville, Kentucky. That data were obtained from strain gages installed at 6 test locations on the downstream truss.

The fatigue analyses consisted of safe-life and fatigue-crack growth analyses. Safe-life predictions were based on AASHTO fatigue design (SN) curves. To use those curves, equivalent constant-amplitude stresses were derived from the stress histograms. Those stresses and loading frequencies were modified to reflect anticipated increases …

Analysis Of Accident Data In Kentucky (1983-1987), Kenneth R. Agent, Jerry G. Pigman

Kentucky Transportation Center Research Report

Kentucky has a systematic procedure to identify locations that have abnormal rates or numbers of accidents. This procedure utilizes average accident rates and numbers. A primary objective of this study was to determine average accident statistics in Kentucky. An annual safety program for Kentucky, which includes the identification, programming, budgeting, and evaluation of safety projects, is prepared each year. The data presented in this report may be included as the problem identification portion of Kentucky's Annual Highway Safety Plan.

Average and critical accident rates were calculated by highway type for rural and urban highways. A summary of results and recommendations …

1988 Usage Rates And Effectiveness Of Safety Belts And Child Safety Seats In Kentucky, Kenneth R. Agent

Kentucky Transportation Center Research Report

The objective of the survey summarized in this report is to establish 1988 safety belt and child safety seat usage rates in Kentucky to compare to those determined from previous surveys. Also included in this report is an analysis of accident records evaluating the effectiveness of safety belts.

Statewide usage rates in the 19 cities previously surveyed in 1982 through 1986 showed that both driver safety belt usage and child safety seat and safety belt usage increased significantly in 1988 compared to previous years. The statewide usage rate of safety belts by drivers was 20.5 percent in 1988 compared to …

Irish H & V News

Building Services Engineering

No abstract provided.

Development Of A Combined Quantity And Quality Model For Optimal Unsteady Groundwater Management, Richard C. Peralta, J. Solaimanian, C. L. Griffis

Civil and Environmental Engineering Faculty Publications

Presented are alternative techniques for including conservative solute transport within computer models for optimizing groundwater extraction rates. Unsteady two-dimensional flow and dispersed conservative solute transport are assumed. Comparisons are made of the practicality of including modified forms of implicit and explicit finite difference solute transport equations within optimization models. These equations can be calibrated and subsequently used within a MODCON procedure. The MODCON modelling procedure consists of an integrated series of five optimization or simulation modules. The procedure is applicable for either an entire aquifer system or for a subsystem of a larger system. The first module, A, computes physically …

Development Of A Rock Model Testing Capability At The New Jersey Institute Of Technology And Testing Of Plane Stress Models Possessing A Central Circular Opening With A Nearby Horizontal Discontinuity, David R. Good

Theses

This thesis had three main objectives. They were to develop a rock model testing capability at N.J.I.T. by (1) developing and building a load testing frame for rock models, including all necessary appurtenances and load measuring devices, (2) developing a rock modelling material and quantifying its properties, and (3) applying the capabilities described in items 1 and 2.

A high capacity load test frame was constructed from structural steel members. Heavy screw rams were utilized to apply load and specially constructed proving rings were employed to accurately measure load. Additionally, load platens and other support equipment were constructed.

The model …

Are You Getting Your Money's Worth In Street Construction, Charles F. Scholer

Indiana Local Technical Assistance Program (LTAP) Publications

A presentation on how to have an effective quality assurance program for street construction.

Calcium Nitrite As A Corrosion Inhibitor In Reinforced Concrete Bridge Decks, Theodore Hopwood Ii, David Q. Hunsucker, Edgar E. Courtney

Kentucky Transportation Center Research Report

The use of calcium nitrite es a corrosion-inhibiting admixture in reinforced concrete hes been studied on two bridges· the Kentucky 152 Bridge in Washington County and the Gose Road Bridge in Boyle County. Calcium nitrite was added to concrete used in the slabs, diaphragms and barriers of the KY 152 bridge and only in the slab of the Good Road bridge.

Construction of both structures was monitored in the fall of 1986. Placement of concrete on both bridges was satisfactory; however, problems were experienced in finishing the concrete. The finishing problems were related to: 1) concrete 'stickiness', 2) use of …

Asphalt Surface Treatments For Local Roads And Streets, Ellis G. Williams

Kentucky Transportation Center Research Report

Surface Treatments are thin applications of asphalt, with or without aggregate, to an existing pavement surface. There are many types to choose from when selecting a treatment for a specific purpose.

Because of the broad range of materials and methods available, surface treatments satisfy many needs in effective operation of road and street systems. They are major tools for preventive maintenance and also satisfy many corrective maintenance needs. They are widely and effectively used as the initial surfacing over granular bases. They are increasingly used over cracked, existing surfaces to reduce reflection cracking in asphalt overlays.

It is apparent that …

Maximizing Reliable Crop Production In A Dynamic Stream/Aquifer System, Richard C. Peralta, K. Kowalski, R. R.A. Cantiller

Civil and Environmental Engineering Faculty Publications

A procedure for planning the optimal spatial distribution of crops to be reliably irrigated by conjunctive use of water resources is presented. The implicitly stochastic procedure utilizes. simulation/ optimization model of • stream/ aquifer system. The model utilizes linear optimization, hydrologic influence coefficients and time-varying crop water production functions. It appropriately simulates the time variant, interdependent responses of groundwater levels, stream nap and stream/aquifer interflow to groundwater pumping, and diversion of river water to nonriparian lands. It determines the temporally and spatially varying distribution of groundwater and diverted river water that should be utilized In order to maximizing annual crop …

Highway Safety Research, Development, And Technology Transfer, John A. Deacon

Kentucky Transportation Center Research Report

Late in 1987, the Federal Highway Administration assembled a seven-member panel which, guided by a primary contractor, Harrison Boyd & Associates, was charged with the task of developing a recommended five-year research, development, and technology transfer program for highway safety starting in the 1990s. As a part of the task, each panel member prepared an individual position paper to stimulate and focus panel discussions and, ultimately, to provide the basis for a consensus paper. This represents one such individual paper.

Although it is believed that significant safety gains can be achieved in the 1990s and beyond simply by more extensive …

Comparison Of Rigid Pavement Thickness Design Systems, Herbert F. Southgate

Kentucky Transportation Center Research Report

Rigid pavement thickness design systems investigated during this study were the 1986 AASHTO, American Concrete Pavement Association (ACPA), Portland Cement Association (PCA), and Kentucky methods. The ACPA system is a computer program based upon the 1966 AASHTO design equation. It was difficult to evaluate and compare the Kentucky method to the PCA system because the input and analysis procedures differ greatly.

The Kentucky method is based upon the fatigue relationship involving the value of work at the bottom of the concrete pavement caused by the applied load and repetitions of an 18-kip single axleload. The AASHTO method was derived from …

Soil-Bridge Abutment Interaction, Bobby W. Meade, David L. Allen

Kentucky Transportation Center Research Report

Presented herein are analyses of 6 bridge approaches. Lateral movement and settlement of the foundations and embankments are discussed. Result·s of slope stability and finite element analyses are related to measured movements. A graph for predicting approach pavement settlement is included. A theoretical approach model was used to run an extensive series of finite element analyses. Movements resulting from these analyses are presented with several variable model conditions. Variable conditions include embankment and foundation configuration, soil cohesion, and soil friction angle.

Optimal Conjunctive Use-Sustained Yield Pumping Analysis For Eastern Arkansas, Rosalinda R.A. Cantiller, Richard C. Peralta, Hossein Azarmnia

Civil and Environmental Engineering Faculty Publications

The likelihood that irrigated agricultural acreages will increase in eastern Arkansas is high. This results from favorable agricultural soils, climate, and the availability of significant water resources.

Earthquake Priority Routes For Mclean County, Kentucky, David L. Allen, Vincent P. Drnevich, L. John Fleckenstein, Mostafa Sayedsadr

Kentucky Transportation Center Research Report

No abstract provided.

Evaluation Of A Polymer Asphalt Additive -- Kraton (1118 And 4141), L. John Fleckenstein, David L. Allen

Kentucky Transportation Center Research Report

This report documents the use of two types of asphaltic concrete mixture designs. Both the control mixture and a Kraton rubber mixture were placed on sections of the Hazard Bypass, in Hazard, Kentucky. The location of the project is shown in Figure 1.

Evaluation Of Hydraway Edge Drain On Pennyrile Parkway, David L. Allen, L. John Fleckenstein

Kentucky Transportation Center Research Report

No abstract provided.

Effect Of Fabric On Stress-Strain Relation, Volume Change, And Dynamic Shear Modulus Of Ottawa Sand, Ming-Tarng Chen

Civil & Environmental Engineering Theses & Dissertations

To evaluate the effect of fabric on stress-strain behavior, volume change, and the dynamic shear modulus of Ottawa sand, four series of tests on hollow cylindrical specimens were performed by a torsional simple shear/resonant apparatus. All specimens were first isotropically consolidated, and then sheared along the different stress paths while keeping the mean effective stress constant. The test results showed that depositional fabric had a slight influence on the stress-strain behavior, and one half-cycle of pre-shearing created a clear anisotropy on the stress-strain response. The intermediate principal stress had a dominant effect on volume change characteristics but it might not …

Estimation Of In-Situ Compression Index Of Contaminated Clays Using The Electrical Method, Prasanna Ratnaweera

Theses

For contaminated clay soils, it has been found that current testing methods to determine compressibility characteristics do not truly identify the physico-chemiral interaction present in the soil-pore fluid-electrolyte system. Most methods are virtually impracticable due to various reasons such as evaporation of pore-fluid, difficulty of handling toxic chemicals, etc. Also, destructive test methods may not maintain in-situ conditions while testing.

The electrical properties of soils, the dielectric dispersion in particular is considered to represent the amount of physico-chemical interaction present in the soil-pore fluid-electrolyte system. For uncontaminated soils, correlations between the dielectric dispersion and the slope of the isotropic consolidation …

Optimal Allocation Of Water Among Industries In Dar Es Salaam City, Tanzania, J. I. Matondo

Tanzania Journal of Engineering and Technology (TJET)

Dar es Salaam is the city with the largest number of industries in Tanzania. However, the water demand for these industries is more than the supply. Therefore, there is a water use competing problem among the industries. Dynamic programming technique has been applied to optimally allocate the available water among the industries with the objective of maximizing the net benefits. Results reveal that, industries with the highest net return per unit of water will get the first priority of being allocated water.

Development Of A Spray Drought Cooling Tower, O. K. Kaunde

Tanzania Journal of Engineering and Technology (TJET)

ABSTRACT A noval type direct contact cooling tower has been proposed in which the gas or air entering the tower is drawn by the ejector action of the sprays through which the feed water is admitted. The advantage offered by this type of tower is that it eliminates the usages of fan, thus saving the capital cost and power to drive it.

Entrainment of air by water was studied in a laboratory cooling tower and the result of the entire experiment indicate that the development of a spray drought tower is a feasible practice.

A General Correction For Spontaneous Potential Well Logs In Fresh Water, Cary L. Mcconnell

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A generalized empirical relationship was found which corrects spontaneous potential (SP) readings from well logs run in freshwater wells. The function was found by correlating measured and calculated spontaneous potentials. The calculated values are based on actual measured ionic content of groundwaters and are fully corrected for environmental effects and ion species. Without the empirical relationship the electrically equivalent to an NaCl solution resistivity, Rwe, is generally too low for fresh waters when computed with existing commercially available functions. The low Rwe makes the water appear saltier than it really is. One hundred sixty-two (162) individual formations from one hundred …

Design Of Automotive Structural Components Using High Strength Sheet Steels Structural Strength Of Cold-Formed Steel I-Beams And Hat Sections Subjected To Web Crippling Load, Shin-Hua Lin, Ling-En Hsiao, Chi-Ling Pan, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION When cold-formed steel beam webs are subjected to partial edge loading, they may fail by web crippling rather than bending of the beam. Web crippling is caused by a highly localized intensity of the load or reaction. Because of the complexity of the web crippling behavior, empirical expressions are presently used for the design of cold-formed steel beams in buildings and automotive structural components to prevent web crippling. 1,2,3. The research on the structural behavior of cold-formed steel beam webs subjected to web crippling has been conducted at Cornell University and the University of Missouri-Rolla (UMR) under the sponsorship …

List Of Conference Participants, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Concluding And Banquet Remarks And Speech, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.