Civil Engineering Commons^™

Indoor Premise Plumbing: The Relationship Between Water Stagnation, Chlorine Decay, And Total Organic Carbon Levels, Emerson M. Ringger, Andrew J. Whelton, Tolulope Odimayomi, Maryam Salehi

The Summer Undergraduate Research Fellowship (SURF) Symposium

Drinking water safety is critical to the health of populations worldwide, and modern plumbing infrastructure can influence drinking water chemical characteristics. Inside residential and commercial buildings however, water use and contact with different plumbing components can vary. For example, water can endure lengthy stagnation periods and residual disinfectant agents like chlorine can decay, leaving the water vulnerable to microbial growth. Plastic cross-linked polyethylene (PEX) pipes have become popular and have shown to influence water quality. While several studies have been carried out on chemical leaching from PEX piping, none were found that examined the role of pipe diameter in relation …

Load Distribution Of Adjacent Prestressed Concrete Box Beam Bridges, Luis F. Urrego, Ryan T. Whelchel, Robert J. Frosch, Christopher S. Williams

The Summer Undergraduate Research Fellowship (SURF) Symposium

One of the most common bridge types is the adjacent prestressed concrete box beam bridge because the system is economical and simple to build; over 43,000 are currently in service within the US. However, they are highly susceptible to strand corrosion and concrete deterioration which can result in early loss of load capacity. Therefore, an experimental program sponsored by the Indiana Department of Transportation (INDOT) was initiated to determine the behavior of deteriorated beams and develop recommendations for load rating and design of this bridge type. Displacement sensors were installed on a bridge in service to measure its deformation under …

Extra-Terrestrial Habitat Systems: Safety, Reliability, And Resilience, Jory C. Lyons Jr., Amin Maghareh, Audai Theinat, Shirley Dyke, Antonio Bobet

The Summer Undergraduate Research Fellowship (SURF) Symposium

Developing a resilient extra-terrestrial habitat with regards to long-term reliability and safety from hazards including radiation, meteorites, and quakes is necessary to ensure human survival during interplanetary exploration. The objective of this study is to examine conventional aerospace safety and reliability analysis techniques to investigate whether they are sufficient to achieve resilience in extra-terrestrial habitats. These results will be obtained to complete a strengths, weaknesses, opportunities, and threats (SWOT) analysis of compiled techniques to design a sustainable habitat system. Failure modes, effects, and criticality analysis (FMECA) and probabilistic risk assessment (PRA) with their past applications will be assessed to provide …

Satellite-Based Monitoring Of Spatiotemporal Changes In Batudulang Forest In Sumbawa, Indonesia, Mohammad Muslim, Arief Budhi Witarto, Wahyu Indrajaya

Makara Journal of Technology

Space-based earth observation technology applicable to forest inventory and monitoring is well known in the scientific community. High-resolution satellite images form an important data source for forest mapping and change detection at regional and national scales. The value of forest change information derived from remote sensing data is significantly enhanced if this information is integrated into a spatially explicit geographic information system. Satellite-based rapid assessment was conducted to measure spatiotemporal changes in Batudulang forest over the years. The general approach to quantify change in the spatial aspect of the forest involved change detection using moderate-resolution imaging spectro-radiometer satellite-based normalized difference …

Strength Structure Analysis Of Main Gate Graving Dock Using Pontoons For Condition Repairs, Budianto Budianto

Makara Journal of Technology

Main gate graving dock with pontoon type can certainly suffered some level of damage after a long period of operation. Many employments within the graving dock can delay the process repair of main gate. The main gate may not be opened, because employees are still working to ship fabrication process under sea waterline. For accommodate these interrelated conditions, the best solution with repair one side of the main gate with type pontoon and employees can still work ship fabrication process in graving dock conducted simultaneously. The repair process conditions must be required main gate structure that consists of only one …

Microstructures And Hardness Of Tig Welded Experimental 57fe15cr25ni Steel, Parikin Parikin, Mohammad Dani, Abu Khalid Rivai, Agus Hadi Ismoyo, Riza Iskandar, Arbi Dimyati

Makara Journal of Technology

The microstructures and hardness of tungsten inert gas (TIG) welded experimental 57Fe15Cr25Ni steel were investigated through optical–scanning electron microscopy analyses and with a hardness tester, respectively. The welding process restructured the constituent atoms into regular and irregular crystal lattices. Rapid cooling of the weld metal allowed the formation of a dendritic (columnar) structure, with porous grains. By contrast, slow cooling influenced HAZ and led to the formation of grain structures. The crystal lattice became more organized and larger than other zones. Meanwhile, the base metal formed circular nets that covered large area inside thick and thin grain boundaries. The diffraction …

Mapping Of Bruise Of Oil Palm Fresh Fruit Bunch During Loading And Transportation From Field To Mill, Andreas Wahyu Krisdiarto

Makara Journal of Technology

Fresh fruit bunches (FFBs) are used as raw materials for palm oil, and their transport from a field is a critical step to maintain their quality. Fruit integrity should be maintained so the mill can efficiently obtain palm oil with less than 5% free fatty acid content. Physical treatments for FFBs during loading to truck bins and transport may cause physical injuries. This research aimed to map fruit bruises. The map can be used as a basis in managing transport of FFBs. Physical injuries were assessed by bruise index (BI), which was calculated by measuring the bruise area and weight …

Benchmarking Product Service System Of Generator Set Distributors, Venny Violetta Tiurindah, Tanika Dewi Sofianti

Makara Journal of Technology

Power generation is an industry that is essential to sustain daily life and competes with generator set distributors. The product service system of distributors must be improved to survive the competition. This research aims to develop tools for benchmarking the product service system of generator set distributors. Benchmarking identifies gaps between a product and other competitors’ products. In this work, a product service system board is used to visualize the current product service system of a generator set distributor. A PPIAF framework and a SERVQUAL framework are adapted to assess product performance and service quality, respectively. AHP is used as …

Irrigania Game Activity - Ii, Kaveh Madani

All ECSTATIC Materials

Directed class activity for students to play the Irrigania Game by Seibert and Vis (2012). Students choose to irrigate fields each year (round) with rainwater, surface water, or groundwater to maximize profit. Six different games are described.

Game 1

• Objective: Maximize your individual rank (profit) in class

• Rules: 1) No communication between you and any other farmer, 2) Precipitation = Normal (P=1), 3) Number of years (rounds) = 15.

Game 2

• Objective: Maximize your individual rank (profit) in class
• Rules: 1) No communication constraints, 2) Precipitation = Normal (P=1), 3), Number of years (rounds) = 15.

Game 3

• Objective: Maximize …

Climate-Informed Environmental Inflows To Revive A Drying Lake Facing Meteorological And Anthropogenic Droughts, Mojtaba Sadegh

Civil Engineering Faculty Publications and Presentations

The rapid shrinkage of Lake Urmia, one of the world’s largest saline lakes located in northwestern Iran, is a tragic wake-up call to revisit the principles of water resources management based on the socio-economic and environmental dimensions of sustainable development. The overarching goal of this paper is to set a framework for deriving dynamic, climate-informed environmental inflows for drying lakes considering both meteorological/climatic and anthropogenic conditions. We report on the compounding effects of meteorological drought and unsustainable water resource management that contributed to Lake Urmia’s contemporary environmental catastrophe. Using rich datasets of hydrologic attributes, water demands and withdrawals, as well …

Geophysical Assessment Of Subsurface Soil Conditions Using Capacitively Coupled Resistivity, Folaseye Coker

Graduate Theses and Dissertations

The purpose of this research is to explore the applicability of Capacitively-Coupled Resistivity (CCR) as an improvement on traditional drilling and sampling methods for subsurface soil investigations. The CCR method could be used to identify critical locations for drilling and sampling such as expansive clay layers and anomalies (sinkholes, unknown landfills, etc.) rather than uniformly sampling across a site. CCR surveys were performed at Alpena, Arkansas along a highway expansion project changing US 62 from a two lane to four lane highway, and at Alton, Illinois along the Mel Price Levee, a 5.2 mile levee along a portion of the …

Computer Modeling Of Close-To-Ground Tornado Wind-Fields For Different Tornado Widths, Mohammadhossein Kashefizadeh

Graduate Theses and Dissertations

Tornadoes induce different wind forces on buildings than straight-line (SL) winds. The tangential velocity (Vθ) of tornados is the main parameter that causes damage to the buildings. In-field tornado measurements cannot evaluate the tornado’s Vθ at less than 20m above ground level (AGL). The laboratory tornado simulators suggest that the Swirl ratio (S) and the radius (ro) are the most influential factors affecting Vθ. However, due to scaling problems, laboratory simulators cannot report the Vθ for elevations less than 10m AGL. Well refined computational fluid dynamics (CFD) models can evaluate the Vθ at less than 10m AGL. However, the CFD …

Proposed Astm Standard For The Stokoe-Type Resonant Column Torsional Shear Device, Anh Tuan Tran

Graduate Theses and Dissertations

Resonant Column Torsional Shear (RCTS) testing has become one of the most commonly used methods for determining laboratory soil stiffness and soil damping. The RCTS test has been accepted and is commonly utilized during the permitting of new nuclear facilities. However, there is still no available public standard for performing RCTS tests using the Stokoe-type device. Therefore, an ASTM standard for calibration and performance of RCTS tests using the Stokoe-type RCTS device is presented herein. Data collected using the Stokoe-type RCTS devices at the University of Arkansas (UofA) and at the Norwegian Geotechnical Institute (NGI) also aided in the development …

Testing And Development Of Pre-Stressed Cfrp Retrofit Strategies For Controlling Fatigue Cracking In Steel Waterway Lock Gate Structures, Maggie Langston

Graduate Theses and Dissertations

Steel waterway lock gates across the national inland waterway transportation network are reaching and exceeding their intended service life, often experiencing component failures that lead to service interruptions. Unscheduled maintenance and repair of lock gates can be expensive and cause economic ripples throughout the entire inland waterway network. These lock gate component failures are often caused by fatigue cracking from repeated loading during operation. This thesis develops and tests a prestressed carbon fiber reinforced polymer (CFRP) fatigue retrofit for controlling fatigue demands within lock gate components. The study expands upon a recent analytical work by Lozano (2017) by experimentally investigating …

Evaluation And Strengthening Of Elevated Slab On Grade With Fiber-Reinforced Polymer (Frp) Laminates, Natawut Chaiwino

Civil Engineering Dissertations - Archive

Elevating a residential house appears to be one of the most effective techniques to eliminate or alleviate flood losses. In general, the elevation procedures involve raising a house as well as its typical slab-on-grade (SOG) foundation and supporting it with an additional support system. The unconcerned effects of the drastic changes in support condition could lead to severe structural damages and failure of houses. After elevated, thus, such slabs must be properly supported and retrofitted, for which the available methodology and know-how is almost nonexistent. The fiber reinforced polymer (FRP) application, considered as a promising technique in the rehabilitation of …

Experimental And Numerical Investigation Of The Concrete Shear Strength Of Reinforced Concrete Box Culverts Under Uniformly Distributed Load, Masoud Ghahremannejad

Civil Engineering Dissertations - Archive

This research resulted in the development of a new method for performing displacement control analysis of distributed loads to obtain the ultimate shear strength of structural components. A framework, consisting of several sub-frames, was designed to convert the single displacement applied at the top of the framework to equivalent uniformly-distributed forces applied to the beam. To validate the loading mechanism, using the proposed framework, the load was applied on the top of a reinforced concrete beam in the laboratory, and numerical studies were conducted. The shear capacity of the beam under a concentrated load at mid-span was compared with the …

In-Service Performance Evaluation Of Fire And Impact Damaged Bridges With Cfrp Laminate Strengthening, Santosh Timilsina

Civil Engineering Dissertations - Archive

Fire events and impact damage on bridges are few of the least understood of common extreme events. Bridge infrastructures that are subjected to hazards such as fire or impact from over height vehicle can catastrophically collapse or be heavily damaged. External wrapping of damaged concrete bridge components with Fiber Reinforced Polymer (FRP) laminates has been used as a strengthening technique for these bridges. Two such in-service bridges, one of which was fire damaged and the other impact damaged, both aged more than 50 years old in Irving, Texas, were selected for this study. The damaged beams of the concrete bridges …

Developing A Framework To Optimize The Operations Of An Intermodal Underground Freight Transportation Terminal Using Simulation, Fatemeh Rezaeifar

Civil Engineering Dissertations - Archive

According to the U.S. Department of Transportation (USDOT), by 2040, nearly 30,000 miles of our busiest highways will be clogged daily and it is important to increase the capacity of our transportation system. Construction of intermodal underground freight transportation (UFT) systems for freight movement through underground pipelines or tunnels, can increase the capacity of the existing shipping network. The intermodal terminal is a major component of the UFT’s innovative infrastructure project. Increasing demand for container transportation systems in terminals will raise the risk of terminal congestion and delivery delay due to the increase in freight transportation system bottlenecks (traffic jams …

A Calibration Chamber For Thermo-Hydro-Mechanical Studies Of Soil Behavior Via Resonant Column Testing, Daniel R. C. Green

Civil Engineering Theses - Archive

Abstract A Calibration Chamber for Thermo-hydro-mechanical Studies of Soil Behavior via Resonant Column Testing Daniel R. C. Green The University of Texas at Arlington, 2018 Supervising Professor: Dr. Laureano Hoyos A considerable portion of the emerging geothermal infrastructure in the country is located in earthquake prone areas while being supported and/or surrounded by soil deposits located well above the groundwater table. Geotechnical earthquake research in the country, however, continues to be mostly focused on soil response under saturated conditions, especially soil liquefaction phenomena, while most of the work on dynamic response of compacted soils has not taken suction or thermal …

Development Of A Framework To Estimate Social And Environmental Costs Of Truck, Railroad, And Underground Freight Transportation, Amir Tabesh

Civil Engineering Dissertations - Archive

Increasing freight transportation capacity is the most important factor to keep US economy viable. Trucks moved 11.5 billion tons of goods, or 63.8 percent of total freight shipments in 2015, which is projected to grow to 16.6 billion tons by 2045. It is predicted truck travel may increase from 282 million miles per day in 2012 to 488 million miles per day by 2045. The U.S. railroad system includes 138,000 rail miles, which 93,500 miles owned and operated by Class I railroad and the rest of them owned and operated by regional and local railroads. While the miles of railroad …