Civil and Environmental Engineering Commons^™

Wind Energy Project Final Report, Daniel Mendelsohn, Deborah Crowley, Applied Science Associates, Inc, East Bay Energy Consortium

East Bay Energy Consortium Documents

No abstract provided.

Quality Control Of Soil Water Data In Acis – A Case Study In Nebraska, Jinshing You, Kenneth G. Hubbard, Rezaul Mahmood, Venkataramana Srihar, Dennis Todey

Civil Engineering Faculty Publications and Presentations

Soil moisture is the key state variable from both climate and hydrologic cycle assessment perspectives. Automated measurements of soil moisture were not possible in the past decades. Sensors deployed in the field with real-time monitoring networks such as the Automated Weather Data Network (AWDN) in Nebraska have not only become affordable but enhanced the monitoring capability of the network with valuable soil moisture data added to the existing stream of hourly and daily weather data for precipitation, air temperature, humidity, solar radiation, wind speed, and soil temperature. However, to assure the quality of the data, quality control (QC) tools are …

New Approach For Surface N Factors, James L. Hanson, Nazli Yesiller, Gareth E. Swarbrick, Wei-Lien Liu

Civil and Environmental Engineering

Air and surface freezing and thawing indexes and prediction of ground temperatures from air temperatures were investigated. A new method for applying n factors on a daily basis to capture localized temperature extremes is presented and compared to conventional seasonal n-factor analysis. Measured air temperatures from five locations and measured air and surface temperatures from one location were used. Freezing and thawing indexes were determined using daily and monthly average temperatures, different time frames, and seasonal and daily applications of n factors. Air and surface freezing indexes (I_af and I_sf) varied more than air and surface …

Rebuilding After Disaster - Engineering Lessons From The 2004 Tsunami, Liam Mccarton

Articles

On 26th December 2004 a magnitude 9 earthquake occurred off the west coast of northern Sumatra, Indonesia. The sudden and violent vertical displacement of the sea floor caused a disturbance to the overlying water column, which generated waves (tsunami) that propagated rapidly across the whole of the Indian Ocean. Typically, in open ocean waters, these waves have long wavelengths of the order of 200km and low trough to crest amplitudes. These properties allow them to conserve energy as they propagate over large distances. As the waves enter the shallower waters of coastal areas, their amplitude increases dramatically and their velocity …

Simulation Of Traffic Loading On Highway Bridges, Bernard Enright

Other resources

This work is based on weigh-in-motion measurements for approximately three million trucks obtained from sites in five European countries. Techniques have been developed, supported by photographic evidence, for filtering the measurements to identify and remove unreliable values, and for the classification of extremely heavy vehicles. The collected measurements have been used as the basis for building and calibrating a Monte Carlo simulation model for bridge loading. Two-lane traffic is simulated – either two lanes in the same direction or one lane in each direction. The model allows for vehicles that are both heavier and have more axles than in the …

Poppleton Creek Wet Detention Pond, Stormwater Academy

BMP Trains Research and Publications

No abstract provided.

Influence Of Material Type, Aggregate Size, And Unconfined Compressive Strength On Water Jetting Of Cidh Pile Anomalies, Joseph Carl Heavin

Master's Theses

Water jetting as a means for removing anomalous materials from cast-in-drilled-hole (CIDH) piles was examined. The primary objective of this research was to establish empirical relationships between different jetting parameters and the removal of commonly occurring anomalous zone materials, including low-strength concrete, slurry mixed concrete, grout, and clay soil. Also investigated was the current standard-of-practice used by water jetting contractors within California. The testing specimens consisted of typical anomalous material with unconfined compressive strengths between 5 and 6,000 psi. The experimental work consisted of water blasting submerged specimens using rotary jets, nozzles, and pumping equipment typically used in construction practice. …

Pavement Settlement Issues And Hydro-Geochemical Water Testing Results For The Cumberland Gap Tunnel, Brad Rister, Clark Graves, Jim Dinger

Kentucky Transportation Center Research Report

Both Ground Penetrating Radar (GPR) surveys and Hydro-Geochemical Water Testing (HGWT) have been performed at the Cumberland Gap Tunnel to determine why the reinforced concrete pavement has settled in various areas throughout both tunnels. To date, approximately 7,300 total square feet of pavement surface has voids beneath it that range from 0.05 to 40 inches in depth. Both GPR and HGWT results indicate that approximately 0.75 to 1.5 cubic yards of limestone sub-base material leaves the tunnel in solution form on a monthly basis. Furthermore, HGWT results indicate that the ground water beneath the tunnels is calcium deficient. Thus allowing …

Nondestructive Testing Of Defective Astm A 514 Steel On The I ‐ 275 Combs‐Hehl Twin Bridges Over The Ohio River In Campbell County, Kentucky, Theodore Hopwood Ii, Sudhir Palle

Kentucky Transportation Center Research Report

Three defective ASTM A 514 steel splice plates were discovered on the I-275 Combs-Hehl twin bridges over the Ohio River. A follow-on in-depth field inspection of 1,356 A 514 steel plates on the bridges revealed 14 additional defective gusset and splice plates. The A 514 steel was improperly heat-treated resulting in a brittle crack-prone microstructure. Ultrasonic and impact hardness tests were used to identify the defective steel. Subsequently, the defective steel plates were either removed or lapped with additional steel plates.

Concrete Cracking In New Bridge Decks And Overlays, Baolin Wan, Christopher Foley, Jordan Komp

Transportation Reports with the Wisconsin Department of Transportation

There appears to be a trend for new bridge decks in the state of Wisconsin to develop early-age transverse cracks and map cracks on concrete overlays. A comprehensive literature review of the potential causes of concrete bridge deck cracking is provided. Fifteen bridge structures found in the recently completed Marquette Interchange were analyzed using 21 variables thought to cause early-age bridge deck cracking. Visual inspection of sixteen bridges in Milwaukee is described. The inspections show that the continuous superstructures have more cracks than the simply-supported bridges. A finite element model was created for a typical two-span continuous superstructure with HL-93 …

Identification And Implementation Of Best Management Practices For Erosion And Sediment Control That Conform To Indiana Storm Water Quality Regulations And Guidance, Lynn A. Corson

JTRP Technical Reports

No abstract provided.

The Role Of Driver Age And Gender In Motor Vehicle Fatal Crashes, Heng Wei, Deogratias Eustace

Civil and Environmental Engineering and Engineering Mechanics Faculty Publications

This study compares the age and gender of at-fault drivers who were involved in fatal crashes and the corresponding driving errors that contributed to these crashes. This comparison provides insights that may help traffic engineers devise countermeasures to lessen the number of these unnecessary deaths. Data from the Fatality Analysis Reporting System (FARS) for the years 2001 through 2003 were used in this study. The analysis included passenger vehicles (automobiles, utility vehicles, minivans, and pickup trucks) involved in either single or two vehicle crashes. The driver responsible in each crash was identified through the driver error variable codes as listed …

Development Of A Framework For Ex Post Facto Evaluation Of Highway Project Costs In Indiana, Abhishek Bhargava, Samuel Labi, Kumares C. Sinha

JTRP Technical Reports

Researchers and engineers continue to ponder over the reliability of construction cost forecasts made at the early stages of project development. After a project has been incorporated in the statewide transportation improvement program, increasingly detailed estimates of its cost are prepared at the remaining stages of project development, namely, design estimate, engineer’s estimate, and bid estimate. The accuracy of such estimates has critical consequences on contract administration and asset management in general. Most agencies do not have a methodological framework to identify projects where final cost is likely to exceed the cost estimate, or where the cost estimate is likely …

Innovative Bridge Construction Program: Implementation Of Full-Depth Bridge Deck Panels In Indiana, Robert J. Frosch, Julio A. Ramirez, Stephen Price

JTRP Technical Reports

This research evaluates the use of precast, prestressed bridge deck panels on new and existing precast, prestressed concrete girders. The evaluation focuses on the ease of construction and the ability of the system to develop composite action with the concrete girders. A system developed by the Connecticut Department of Transportation (CDOT) and Precast/Prestressed Concrete Institute New England Region (PCINER) was chosen for testing from available systems because it is representative of the current geometry of precast bridge deck panels. The CDOT system was evaluated in a series of large scale tests in which the panels were placed on a 40 …

A Truck-Mounted Scour Inspection System For Indot, Dennis Lyn, Thomas Cooper, Ranadeep Das

JTRP Technical Reports

Scour monitoring may be a useful tool for INDOT in dealing with local scour problems at bridge sites, and a truck-mounted scour-monitoring system is an attractive option offering flexibility in deployment and cost-effectiveness. This report deals with two aspects related to the further development of such a system: i) a web application that combines the latest available information regarding streamflow with relevant information regarding bridges considered susceptible to bridge scour, thereby assisting in truck-deployment decisions, and ii) development of an acoustic positioning system as a replacement of the original mechanical positioning in order to improve the ease of use.

The …

2010 Directory Of Indiana State, County, City And Town Officials Responsible For Road And Street Work, Indiana Ltap

Indiana Local Technical Assistance Program (LTAP) Directory

Contact information for local agency officials and employees responsible for Indiana’s local road infrastructure.

Bs News March/April

Building Services Engineering

No abstract provided.

Stress-Dilatancy Relation For Mohr-Coulomb Soils Following A Non-Associated Flow Rule, J Zhang, Rodrigo Salgado

Lyles School of Civil Engineering Faculty Publications

Rowe's stress–dilatancy relation for frictional (cohesionless) materials has been a cornerstone of soil mechanics. The original derivation of this relationship was based on incorrect energy minimisation considerations, but the relationship was proven later by De Josselin de Jong using friction laws, and has been confirmed by a large body of experimental results. In contrast, the validity of Rowe's stress–dilatancy relation for cohesive-frictional materials, which has also been used, although not as extensively, was never verified. This paper shows that Rowe's stress–dilatancy relation for Mohr–Coulomb soils (cohesive-frictional materials) is in fact incorrect. The paper also provides a correct stress–dilatancy relationship for …

Performance Of A Stormwater Filter And Bacteria Inactivation Using Biocidal Media, Alexander Scott Bowerman

Master's Theses

There are many possible ways to mitigate stormwater pollution, but this study focused on the DrainPacTM catchment basin insert and the feasibility of integrating N-halamine biocidal brominated beads into the filter system. This study was divided into three sections. The first section involved testing a DrainPacTM filter for treatable flow rates, head loss, and removal of solids, oil, and bacteria. The DrainPacTM filter is designed to be installed in a stormwater catch basin. The filter is composed of a 12 x 41 inch metal frame with textile filter media attached to it in a basket shape. The upper portion of …

City Of Davis Greenbelt Master Plan, Brandon Haydu

Master's Theses

The City of Davis is currently updating its Parks and Recreation Facilities Master Plan. During the update, greenbelts were identified as a highly used and desired facility. This Greenbelt Master Plan serves as a plan focused on the opportunities greenbelts can provide as recreational and transportation facilities. This report has analyzed community feedback, greenbelt coverage, greenbelt capacity, and existing local, state, and federal design guidelines. The final plan is a set of goals, objectives, policies, and programs, along with a greenbelt map, which is aimed at improving the greenbelt infrastructure in Davis through the year 2020.

East Bay Energy Consortium Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.

East Bay Energy Consortium, Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.

East Bay Energy Consortium Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.

Colorado River Water: Mexico's Perspective On The Ongoing Negotiations, Mario López Pérez

US-Mexico Negotiations on Improved Colorado River Management: An Update (February 19)

Presenter: Mario López, Engineering and Technical Standards Manager, National Water Commission of México

53 slides

Agenda: Us-Mexico Negotiations On Improved Colorado River Management: An Update, University Of Colorado Boulder. Natural Resources Law Center, Western Water Policy Program, Colorado Water Conservation Board

US-Mexico Negotiations on Improved Colorado River Management: An Update (February 19)

The United States and Mexico are currently negotiating an international accord on a variety of Colorado River water matters, including the prospects for new water projects, conservation efforts, and operational improvements. Participants are invited to hear an update on these efforts from individuals directly involved in the negotiations, including Mario López Pérez, Engineering and Technical Standards Manager in the National Water Commission of México, who is responsible for binational water issues with the USA, Guatemala and Belize.

Melnikov Analysis Of A Ship's Stability With Water-On-Deck, Ying-Guang Wang

Journal of Marine Science and Technology–Taiwan

The nonlinear ship rolling motion with water-on-deck in regular beam waves is studied by utilizing a global geometric method. A ship stability criterion based upon the Melnikov function is obtained to provide an upper bound on the domain of the potential chaotic rolling motion. Phase plane diagrams and Poincare maps are used to validate the ship stability criterion obtained in this article.

Corner Effects In Deep Excavations-Establishment Of A Forecast Model For Taipei Basin T2 Zone, Chao-Hui Wu, Chang-Yu Ou, Ningchien Tung

Journal of Marine Science and Technology–Taiwan

This study attempts to establish a novel model for forecasting wall deformation and ground surface settlement of deep excavations. The model is developed by considering the corner effect and examining the data from relevant case histories. The study is specifically limited to the construction works in the T2 zone of the Taipei Basin. The following results were obtained: (1) The maximum wall deformation during each excavation step was approximately 0.2%-0.5% of the excavation depth, and was influenced by the corner effect. (2) The maximum ground surface settlement took place approximately at the center of the wall; and settlements at the …

Shape Optimization Of One-Chamber Mufflers With Reverse-Flow Ducts Using A Genetic Algorithm, Min-Chie Chiu

Journal of Marine Science and Technology–Taiwan

Shape optimization on mufflers within a limited space is essential for industry where the equipment layout is occasionally tight and the available space for a muffler is limited for maintenance and operation purposes. To proficiently enhance the acoustical performance within a constrained space, the selection of an appropriate acoustical mechanism and optimizer becomes crucial. A one-chamber muffler hybridized with reverse-flow ducts which can visibly increase the acoustical performance is rarely addressed; therefore, the main purpose of this paper is to numerically analyze and maximize the acoustical performance of this muffler within a limited space. In this paper, the four-pole system …

Closed-Form Solutions Of Large Deflection For A Guyed Cantilever Column Pulled By An Inclination Cable, Jong-Dar Yau

Journal of Marine Science and Technology–Taiwan

Geometric non-linearity becomes an issue of great concern that cannot be overlooked in the analysis of cable-supported structures since their material properties may be in an elastic range but they exhibit nonlinear behavior when loaded. This study intends to present an analytical approach for analyzing the large deflection behavior of a guyed column pulled by a pre-tensioned cable at different stages of installation. The column is assumed to be naturally straight and inextensible, and each cable is modeled as an equivalent tensile bar neglecting the sag effect due to self-weight. Based on an elliptic integral formulation, closed-form solutions are derived …

East Bay Energy Consortium Joint Committee Workshop At The Corporate Offices Of Applied Science Associates, February 12, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.