Civil and Environmental Engineering Commons^™

Corrosion Of Galvanized Fasteners Used In Cold-Formed Steel Framing, Roger A. Laboube

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

The primary objective of this project was to study the effect of corrosion on the structural integrity of galvanized fasteners used in cold-formed steel-framed construction. A number of specific tasks were developed to meet this objective, including a literature search, design and construction of field enclosures, determination of test sites and installation of field enclosures, test specimen design and fabrication, accelerated corrosion testing, structural tensile testing, data analysis and technology transfer.

Development Of Cost-Effective, Energy Efficient Steel Framing: Structural Performance Of Slit-Web Steel Wall Studs, Roger A. Laboube

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Designing Cold-Formed Steel Using The Direct Strength Method, B. W. Schafer

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

The Direct Strength Method is an entirely new design method for cold-formed steel. Adopted in 2004 as Appendix 1 to the North American Specification for the Design of Cold-Formed Steel Structural Members, this paper introduces the Direct Strength Method and details some of the features of a new AISI Design Guide for this Method. The intent of this paper and the Guide is to provide engineers with practical guidance in the application of this new design method. The Direct Strength Method does not rely on effective width, nor require iteration for the determination of member design strength. Instead, the engineer …

Design Of Window Glass For Lateral Pressures, Joseph E. Minor, H. Scott Norville

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

ASTM Standard E 1300-04 ("Standard practice for determining load resistance of glass in buildings") outlines procedures for determining the strength of window glass products when the glass is subjected to uniform lateral pressure. This standard practice addresses each of the commonly used window glass products (monolithic glass, laminated glass, and insulating glass) that are fabricated from annealed, heat strengthened, and fully tempered glass plates, used singly or in combination. the procedures are based on principles of structural mechanics, are thorough, and are presented in clear and concise terms. Analyses of the basis for and the scope of these procedures lead …

Ccfss Technical Bulletin Fall 2006, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

Ccfss News Fall 2006, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Rubble piles created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. Rubble characteristics must be known, for example, in order to predict the ability of a vehicle to override the collateral damage from weapon effects in urban areas. Two types of models are developed: a first-order model and a first-principles-based model. In both models, we assume complete rubblization of the building and develop a rubble profile model using the size and composition of the collapsed structure to predict the rubble volume. In both cases, this …

Comparison Of Aisi Specification Methods For Members With Single Intermediate Longitudinal Stiffeners, B. W. Schafer, Heejae Yang

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

In the current AISI specification, there are two different methods for calculating the effective widths of longitudinally stiffened elements. The first method “B4.1” applies solely to the element with only one intermediate stiffener, whereas the second method “B5.1” works only for those elements with more than one intermediate stiffener. Both methods are accurate in finding the design moments if used appropriately. Although two methods are developed to handle different cases, for some sections with one intermediate stiffener, the second method also works accurately, giving the same result as the first method does for calculating design moments. For some other sections …

Direct Strength Method (Dsm) Design Guide, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

The following Design Guide has been developed under the direction of the American Iron and Steel Institute Committee on Specifications for the Design of Cold-Formed Steel Structural Members. The development of the Guide was sponsored by the American Iron and Steel Institute. The AISI Committee on Specifications wishes to acknowledge and expresses gratitude to Dr. Benjamin Schafer of Johns Hopkins University who was the author of this Guide.

With anticipated improvements in understanding of the behavior of cold-formed steel and the continuing development of new technology, this material might become dated. It is possible that AISI will attempt to produce …

Service Learning At Cincinnati: Researching Water Treatment For Emerging Economies, Sarah I. Pumphrey, Anna Hoessle, Daniel B. Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Of the nearly six billion human inhabitants of planet earth, nearly two thirds lack access to sufficient quantities of potable water and access to basic sanitation. These appalling conditions result in the deaths of millions of children each year from preventable waterborne diarrheal disease. At the University of Cincinnati, two female graduate students have undertaken MS degrees with the specific objective of performing service learning where the research focus of their respective degrees is validating and deploying appropriate technology for water quality treatment in developing countries. This presentation will highlight the results of these research projects as well as the …

An Engineering Research Experience For Teachers: Implementation And Assessment, Anant R. Kukreti, Patricia Mcnerney, Suzanne Wegener Soled, Kelly Josephine Obarski, Mingming Lu, Richard Miller, Daniel B. Oerther, Heng Wei, Thaddeus W. Fowler

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Using Phosphorus Recovery From Wastewater As A Context For Teaching Sustainable Development With Usepa P3 Support, Daniel B. Oerther, Cinnamon Carlarne, Eric Maurer, Regina Lamendella, Sarah I. Pumphrey

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Phosphorus is an essential element required for agriculture. Current practices include "one-way" use of phosphorus: that is mining; production of fertilizer; land application; and ultimately loss to aquatic sediments. Once in the aquatic environment, phosphorus stimulates eutrophication resulting in the "death" of water bodies. With financial support from a People, Prosperity, and Planet program grant of the U.S. Environmental Protection Agency, an interdisciplinary team of faculty at the University of Cincinnati used phosphorus recovery from sewage and re-utilization as a struvite fertilizer as the context for a year-long course of study integrating graduate and undergraduate students in Environmental Engineering and …

Calibration Of The Corelok Method For Determination Of Missouri Aggregate Specific Gravities, David Newton Richardson, S. M. Lusher

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Specific gravity and absorption are fundamental aggregate properties needed for hot-mix asphalt (HMA) and Portland cement concrete (PCC) mix design and/or volumetric determinations. MoDOT utilizes the American Association of State Highway and Transportation Officials (AASHTO) standard test methods T 84 (for fine aggregates) and T 85 (for coarse aggregates) to determine these important properties. Criticisms of these procedures are the subjective nature of determining when the aggregates have reached the saturated, surface-dry (SSD) condition (especially T 84) and the substantial amount of time needed to complete the tests. The CoreLok method addresses these criticisms in that it is an objective …

Disseminating Molecular Biology For Environmental Engineers With Nsf Ccli Support, Daniel B. Oerther, Catherine V. Maltbie, Baikun Li, Jin Li, Amy Pruden, Peter George Stroot

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

For the past five years, more than fifty undergraduate and graduate students at the University of Cincinnati have participated in a term-length course, CEE69 Molecular Biology for Environmental Systems. Using a self-paced approach, teams of students complete laboratory exercises to answer open ended questions about the composition of the microbiological community in an environmental sample. With the financial support of a Adaptation and Implementation (A&I) track grant from the NSF Course, Curriculum, and Laboratory Improvement program the course from Cincinnati is being taught at four partner institutions. This paper highlights the unique challenges of adapting the existing course to other …

2nd Annual Undergraduate Research Conference Abstract Book, University Of Missouri--Rolla

Undergraduate Research Conference at Missouri S&T

No abstract provided.

Semiempirical Electromagnetic Modeling Of Crack Detection And Sizing In Cement-Based Materials Using Near-Field Microwave Methods, Jagadish Nadakuduti, Genda Chen, R. Zoughi

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Detection and characterization of cracks in cement-based materials is an integral part of damage evaluation for health monitoring of civil structures. Microwave signals are able to penetrate inside of dielectric materials (e.g., cement-based materials) and are sensitive to local, physical, geometrical, and dielectric variations in a structure. This makes microwave nondestructive testing and evaluation (NDT&E) techniques suitable for inspection and health monitoring of civil structures. Near-field microwave NDT&E techniques offer the added advantage of providing high spatial resolution, requiring simple hardware that may be portable, low power, fast, real time, and robust. Additionally, these techniques are noncontact and one-sided. Besides …

Ccfss Technical Bulletin Spring 2006, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

Ccfss News Spring 2006, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

Controlling Performance Of Crumb Rubber-Modified Binders Through Addition Of Polymer Modifiers, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The use of tire rubber as a modifier to enhance the properties of asphalt mixes through the wet process has proved to be a successful procedure, but full control of the properties of crumb rubber-modified binders has been a challenge. The literature indicates a wide variation on adding rubber to asphalt and that the degree of success of rubber modification in AC mixes depends on several factors, the majority of which relate to the method of mixing, storing, and transporting and to construction technologies. Understanding the nature of the interaction process between asphalt cement and crumb rubber-modifier (CRM) helps explain …

Earthquake Hazard Input For Loss Estimation Study: St. Louis Highway System, Ronaldo Luna, David J. Hoffman, William T. Lawrence

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The long recurrence period and high consequence earthquakes events in the New Madrid Seismic Zone have caused some federal agencies (e.g., NEHRP, FHWA) to look at the more densely populated areas where higher seismic risk is present. This paper presents the data collection, interpretation, and analysis of the geotechnical information required for an earthquake loss estimation study in St. Louis metro area. The loss estimation study was limited to the highway transportation system, where only the major highways were considered. The project information was processed using a GIS, and the subsequent loss analysis was executed using the HAZUS-MH program.

Strength And Durability Characteristics Of A 70% Ground Granulated Blast Furnace Slag (Ggbfs) Concrete Mix, David Newton Richardson

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

For a bridge pier and abutment mass concrete project, three mixes were studied: an ordinary portland cement (OPC) mix (Type I PC) and two 70% by weight ground granulated blast furnace slag (GGBFS) mixes (Type II Low Heat PC). One of the slag mixes contained a high range water reducer (HRWR). Tests for compressive strength, freezethaw durability, rapid chloride permeability, and salt scaling were conducted on field samples. Results showed that the strengths of the slag mixes were lower than the OPC mix at all ages up to one year, although the use of HRWR did improve the strength somewhat. …

Liquefaction Effects On Lateral Pile Behavior For Bridges, Wei Zheng, Ronaldo Luna

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A coupled pile-soil-structure interaction (SPSI) analysis method is presented to study the liquefaction effects on lateral pile behavior of the highway bridges. Pile-soil interaction is simulated by the dynamic nonlinear p-y method including the effect of liquefaction. The liquefaction effects to the pile-soil interaction are taken into account by introducing a degradation multiplier to the p-y curve. The degradation multiplier is related to the excess pore water pressure buildup at the pile-soil interface. The SPSI analysis method is implemented into a Missouri highway bridge site near the New Madrid Seismic Zone (NMSZ) rift complex for future earthquake scenarios of Mw …

Origin-Destination (O-D) Trip Table Estimation Using Traffic Movement Counts From Vehicle Tracking System At Intersection, S. Lee, Hojong Baik

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A new video-based vehicle tracking system is proposed to provide accurate information on directional traffic counts at intersections. The extracted counts are fed to estimate an origin- destination trip table which is necessary information for traffic impact study and transportation planning. The system utilizes a fisheye lens to expand the area covered by a single camera and uses a particle filtering method to track an individual vehicle. The filter is designed to handle environmental changes and multiple motion dynamics. Experimental results show its strong ability on tracking in various conditions. The paper shows how to use the tracking outputs in …

Effect Of Seeding Materials And Mixing Strength On Struvite Precipitation, Jun Wang, Joel Gerard Burken, Xiaoqi Zhang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Struvite Precipitation Has Increasing Interest as a Technology for Removing and Recovering Phosphorus from Wastewater Streams. Many Chemical Factors Have Been Studied, Such as Optimum PH Values and Component-Ion Molar Ratios, Yet, Understanding of Physical Aspects is Lacking. Two Physical Parameters Were Tested: (1) Seeding Material Addition and (2) Mixing. Objectives Were to Evaluate Three Seeding Materials and to Optimize Mixing Conditions for Struvite-Crystal Precipitation, Growth, and Subsequent Sedimentation. Results Confirm that Mixing Strength and Proper Seeding Materials Increase Crystal Size and Improve Settleability. for Unseeded Solutions, Optimum Phosphorus Removal Was Achieved at a Mixing Strength of G = 76 …

Numerical Simulations Of The Interaction Of Internal Waves With A Shelf Break, S. K. Venayagamoorthy, O. B. Fringer

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The energetics of the interaction of internal gravity waves with a shelf break is investigated by means of high-resolution two-dimensional numerical simulations, with an emphasis on understanding the partitioning of the internal wave energy over the course of the interaction process and the subsequent dynamics of the onshore propagating internal waves. Some of the energy is dissipated as a result of the instabilities associated with breaking, while the remaining energy is either reflected back away from or transmitted onto the shelf. We employ an analysis of the distribution of the energy flux across the shelf break taking into account the …

Disinfection Of Swine Wastewater Using Chlorine, Ultraviolet Light And Ozone, John J. Macauley, Zhimin Qiang, Rao Y. Surampalli, Melanie R. Mormile, Craig D. Adams

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Veterinary antibiotics are widely used at concentrated animal feeding operations (CAFOs) to prevent disease and promote growth of livestock. However, the majority of antibiotics are excreted from animals in urine, feces, and manure. Consequently, the lagoons used to store these wastes can act as reservoirs of antibiotics and antibiotic-resistant bacteria. There is currently no regulation or control of these systems to prevent the spread of these bacteria and their genes for antibiotic resistance into other environments. This study was conducted to determine the disinfection potential of chlorine, ultraviolet light and ozone against swine lagoon bacteria. Results indicate that a chlorine …

Residential Hip Roof Framing Using Cold-Formed Steel Members, Luke Waldo, Sutton F. Stephens, Roger A. Laboube

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Galvanized Steel Framing For Residential Buildings, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Development Of Cost-Effective, Energy Efficient Steel Framing: Structural Performance Of Slit-Web Steel Wall Studs, Nahb Research Center

CCFSS Library (1939 - present)

No abstract provided.

Development Of Cost-Effective, Energy Efficient Steel Framing: Thermal Performance Of Slit-Web Steel Wall Studs, Nahb Research Center

CCFSS Library (1939 - present)

No abstract provided.