Wind Design Of Timber Panelized Roof Structures,
2012
The Structure Group Southwest
Wind Design Of Timber Panelized Roof Structures, Brian Vandenburgh, John W. Lawson
Architectural Engineering
No abstract provided.
Effects Of Inclusion Shapes Within Rigid Porous Materials On Acoustic Performance,
2012
University of Nebraska-Lincoln
Effects Of Inclusion Shapes Within Rigid Porous Materials On Acoustic Performance, Hyun Hong, Siu-Kit Lau
Durham School of Architectural Engineering and Construction: Faculty Publications
The present study investigates the influence of various shapes of inclusions having same volume embedded in a porous rigid material. Previous studies showed improvement of the broadband sound absorption with particular shapes of inclusions. However, different volumes of the inclusions have been considered; therefore, the bulk densities are not the same for comparison. The present study extends the investigations of inclusions in porous materials with same volume (or bulk density) to eliminate the influence by the change of bulk density. The effects of shape will be discussed. Finite element modeling will be used for this study. Total four different shapes: …
Impacts Of Ventilation Ratio And Vent Balance On Cooling Load
And Air Flow Of Naturally Ventilated Attics,
2012
University of Nebraska - Lincoln
Impacts Of Ventilation Ratio And Vent Balance On Cooling Load And Air Flow Of Naturally Ventilated Attics, Shimin Wang, Zhigang Shen
Durham School of Architectural Engineering and Construction: Faculty Publications
The impacts of ventilation ratio and vent balance on cooling load and air flow of naturally ventilated attics are studied in this paper using an unsteady computational fluid dynamics (CFD) model. Buoyancy-driven turbulent ventilations in attics of gable-roof residential buildings are simulated for typical summer conditions. Ventilation ratios from 1/400 to 1/25 combined with both balanced and unbalanced vent configurations are investigated. The modeling results show that the air flows in the attics are steady and exhibit a general streamline pattern that is qualitatively insensitive to the variations in ventilation ratio and vent configuration. The predicted temperature fields are characterized …
The Impact Of Roof Pitch And Ceiling Insulation On Cooling
Load Of Naturally-Ventilated Attics,
2012
University of Nebraska - Lincoln
The Impact Of Roof Pitch And Ceiling Insulation On Cooling Load Of Naturally-Ventilated Attics, Shimin Wang, Zhigang Shen, Linxia Gu
Durham School of Architectural Engineering and Construction: Faculty Publications
A 2D unsteady computational fluid dynamics (CFD) model is employed to simulate buoyancy-driven turbulent ventilation in attics with different pitch values and ceiling insulation levels under summer conditions. The impacts of roof pitch and ceiling insulation on the cooling load of gable-roof residential buildings are investigated based on the simulation of turbulent air flow and natural convection heat transfer in attic spaces with roof pitches from 3/12 to 18/12 combined with ceiling insulation levels from R-1.2 to R-40. The modeling results show that the air flows in the attics are steady and exhibit a general streamline pattern that is qualitatively …
Development And Evaluation Of A Simplified
Modeling Approach For Hydraulic Systems,
2012
Carnegie Mellon University
Development And Evaluation Of A Simplified Modeling Approach For Hydraulic Systems, Yuebin Yu, Vivian Loftness, Daihong Yu, Yan Lu, Volker Hartkopf
Durham School of Architectural Engineering and Construction: Faculty Publications
This paper presents how a hydraulic system can be properly modeled for hydraulic balancing, knowledge of flow distribution, coupled simulation, and evaluation of control, etc. It focuses on water-based heating and cooling systems, which generally have high energy efficiency in design but could perform poorly in reality due to the undersensing condition and strong thermal-hydraulic coupling. The study introduces the motivation, presents the simplified modeling methodology, and illustrates the model and simulating structure. A preliminary evaluation of the method is conducted with two simple simulations. The proposed “node-branch-state” modeling approach could be easily modified, expanded and integrated into a detailed …
Breaking Internal Waves On A Shelf Slope Using Numerical Simulations,
2012
Missouri University of Science and Technology
Breaking Internal Waves On A Shelf Slope Using Numerical Simulations, Subhas K. Venayagamoorthy, Oliver B. Fringer
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The subject of internal waves interacting with bottom topographic features in the ocean has received much attention in the past few decades. This heightened interest is mainly due to a conjecture that breaking internal waves at boundaries can be a significant source of turbulence, leading to mixing and transport in the ocean. In this paper, we present results from high-resolution three-dimensional numerical simulations of an internal wave interacting with a shelf break in a linearly stratified fluid in order to highlight the instabilities that contribute to wave breaking over topography. The results show the development of a nonlinear internal bolus …
Long-Term Performance Of Passive Materials For Removal Of Ozone From Indoor Air,
2012
Missouri University of Science and Technology
Long-Term Performance Of Passive Materials For Removal Of Ozone From Indoor Air, C. J. Cros, Glenn C. Morrison, J. A. Siegel, R. L. Corsi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The health effects associated with exposure to ozone range from respiratory irritation to increased mortality. in this paper, we explore the use of three green building materials and an activated carbon (AC) mat that remove ozone from indoor air. We studied the effects of long-term exposure of these materials to real environments on ozone removal capability and pre- and post-ozonation emissions. a field study was completed over a 6-month period, and laboratory testing was intermittently conducted on material samples retrieved from the field. the results show sustained ozone removal for all materials except recycled carpet, with greatest ozone deposition velocity …
Shake Table Testing Of A Utility-Scale Wind Turbine,
2012
Missouri University of Science and Technology
Shake Table Testing Of A Utility-Scale Wind Turbine, Ian Prowell, Chia Ming Uang, Ahmed Elgamal, J. Enrique Luco, Lanhui Guo
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Shake table tests were undertaken on a full-scale wind turbine (65-kW rated power, 22.6-m hub height, and 16-m rotor diameter) using the Network for Earthquake Engineering Simulation Large High Performance Outdoor Shake Table at the University of California, San Diego. Structural response characteristics and modal parameters are presented for base shaking imparted in two configurations, both parallel (configuration 1) and perpendicular (configuration 2) to the axis of rotation of the rotor. Results are summarized for a series of progressively stronger motions imparted in configuration 1, with analysis identifying damage sources leading to an overall loss in stiffness. Two sources of …
Life Cycle Cost Analysis Under Ireland's Capital Works Management Framework,
2012
Technological University Dublin
Life Cycle Cost Analysis Under Ireland's Capital Works Management Framework, Dermot Kehily, Alan Hore
Conference papers
The Capital Works Management Framework (CWMF) is a structure that has been developed to deliver the Irish government’s objectives in relation to public sector construction procurement reform. This research provides practical guidance and assistance for construction cost professionals in carrying out Whole Life Cycle Cost Analysis (WLCCA) and producing Life Cycle Cost Models(LCCMs) under the CWMF. The research outlines how LCCA calculations can be carried out for cost planning purposes and recommends a standard methodology for presenting LCCMs under the CWMF. The CWMF states that Whole Life Costs (WLC) are an important consideration throughout the design process and should be …
2:1 The Paper Tube Project,
2012
Technological University Dublin
2:1 The Paper Tube Project, Noel Brady
Articles
Review of applied technological solution to rapid building techniques using paper tube and analogous materials to create space enclosing geodesic systems.
An Improved Prediction Model For Spacecraft Damage Following Orbital Debris Impact,
2012
Missouri University of Science and Technology
An Improved Prediction Model For Spacecraft Damage Following Orbital Debris Impact, Joel E. Williamsen, William P. Schonberg
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper offers a new set of 'generic', data-Based hole size and crank length prediction models for spherical orbital debris particles impacting multi-plate targets at velocities up to ~12 km/s. the equations are applicable to a wide variety of spacecraft target configurations, but are limited to hole sizes above, but relatively near, the ballistic limit of the impacting particles. Additional work is underway to expand these models to diameters farther above the ballistic limit for the described shield types.
Effects Of Nano-Copper(Ii) Oxide And Nano- Magnesium Oxide Particles On Activated Sludge,
2012
Missouri University of Science and Technology
Effects Of Nano-Copper(Ii) Oxide And Nano- Magnesium Oxide Particles On Activated Sludge, Guoqiang Liu, Jianmin Wang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Effects of nano-copper (II) oxide (nano-CuO) and nano-magnesium oxide (nano-MgO) particles on activated sludge endogenous respiration (aerobic digestion), biochemical oxygen demand (BOD) biodegradation, and nitrification were investigated through respiration rate measurement. for comparison, the effects of Cu (II) and Mg (II) ions on activated sludge were also studied. Results indicated that soluble Cu (II) has half maximum inhibitory concentration (IC50) values of 19, 5.5, 53, and 117 mg Cu/L for endogenous respiration, BOD biodegradation, ammonium oxidation, and nitrite oxidation, respectively. However, nano-CuO only inhibited BOD biodegradation at 240 mg Cu/L or more, and its associated toxicity was primarily caused by …
2012 Scholarly Productivity Report,
2012
Missouri University of Science and Technology
2012 Scholarly Productivity Report, Missouri University Of Science And Technology
Civil, Architectural and Environmental Engineering Scholarly Productivity Reports
No abstract provided.
Numerical Simulation Of Centrifuge Tests On Homogeneous And Heterogeneous Soil Models,
2011
Memorial University of Newfoundland
Numerical Simulation Of Centrifuge Tests On Homogeneous And Heterogeneous Soil Models, Pradipta Chakrabortty, Radu Popescu
Architectural Engineering
Soil liquefaction is a major cause of seismic damage in cohessionless soil during earthquakes. From past numerical and experimental research it has been observed that more excess pore water pressure (EPWP) is generated during earthquakes in a heterogeneous soil deposit than in the corresponding homogeneous soil with relative density equal to the average relative density of the heterogeneous soil. This interesting phenomenon is investigated here, by numerically simulating centrifuge experiments of seismically induced soil liquefaction using the finite element code DYNAFLOW. Two centrifuge tests are numerically simulated here: one in homogeneous soil and another in heterogeneous soil. Recorded experimental results …
Ann Based Load Identification And Forecasting System For The Built Environment,
2011
University of Nebraska-Lincoln
Ann Based Load Identification And Forecasting System For The Built Environment, Hosen Hasna
Durham School of Architectural Engineering and Construction: Dissertations, Theses, and Student Research
"Phantom Loads" cause energy waste in homes and the built environment as a whole. Consumers spend more than $3 billion a year on "Phantom Load" in the United States alone. The goal of this work is to conserve energy by increasing consumer awareness on their energy usage and appropriate tools which in turn will be reducing and /or eliminating phantom loads and mismanagement of the load in the built environment. A further goal is to improve upon existing power distribution systems in the built environment with limited hardware additions to increase energy conservation. This work investigates remote identification of load …
Modeling Unbound Granular Materials Under Complex Stress Paths,
2011
Missouri University of Science and Technology
Modeling Unbound Granular Materials Under Complex Stress Paths, Cheng Chen, Louis Ge
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Developing reliable and versatile constitutive models for geomaterials has been challenging tasks for nonlinear finite element analysis of geotechnical engineering systems. the fuzzy set plasticity theory has been developed to account for the nonlinear soil stress-strain response under complex stress paths. the theory in many ways resembles the bounding surface plasticity, where the plastic modulus is a function of the distance between the current and image stress states in the stress space. based on the concept of fuzzy set theory in mathematics, a membership function whose value ranges from 1 and 0 is introduced in the Fuzzy Set Plasticity Theory …
Developing Dendrifrom Facades Using Flow Nets As A Design Aid,
2011
California Polytechnic State University, San Luis Obispo
Developing Dendrifrom Facades Using Flow Nets As A Design Aid, Jonas H. Houston
Master's Theses
This thesis highlights a method of arriving at form that minimizes the need for high end technology and complex mathematical models, yet has structural principles of load flow at the highlighted methods core. Similar to how graphical statics assisted earlier architects and engineers to arrive at form by relating form and forces, this thesis suggests a method of form finding that relates the flow of stresses within solid masses to possible load-bearing façades. Looking to nature, where an abundance of efficient structural solutions can be found, this thesis focuses on a tree-like structural form called the dendriform. In doing so, …
Technologies Enabling Sustainability In The Built Environment,
2011
University of Nebraska - Lincoln
Technologies Enabling Sustainability In The Built Environment, Mahmoud Alahmad, Muhammad Zulfiqar, Hosen Hasna Hh, Timothy Wisnieski, Nasser Aljuhaishi, Hamid Sharif
Durham School of Architectural Engineering and Construction: Faculty Publications
Energy conservation is among society’s greatest challenges, and the built environment has a concentrated impact on our natural environment, economy, and health. Fundamental understandings of how energy is consumed, monitored, and controlled are key prerequisites for an energy conservation process. This paper evaluates the effectiveness of real-time energy monitors (RTM) to influence behavior change in residential consumers. A methodology for remote identification of load types along the electrical circuitry where they (load) are being consumed is also presented. The load type and status (on, off, standby) are determined both remotely and in a non-intrusive manner using Non-Intrusive Load Monitoring Methods. …
Application Of Threshold Concepts To Improve A Design-Focused Course In Transportation Engineering,
2011
Missouri University of Science and Technology
Application Of Threshold Concepts To Improve A Design-Focused Course In Transportation Engineering, Dan Cernusca, Ghulam Bham
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Design is an integral part of engineering courses. to address its associated problems, however, is a challenging task in instruction because of design's open-endedness and complexity. in this study, two theoretical models were implemented in an introductory transportation engineering course to address the challenges associated with design of a highway. First, the theoretical framework proposed by the threshold concepts model was used to identify a candidate concept for the instructional redesign process. Two major characteristics of threshold concepts, integrativity and transformativity, were used to identify horizontal alignment as a candidate concept for the highway design process. Second, concept mapping was …
Characterization Of Crushed Rock-Concrete Interface Behavior Through The Parallel Gradation Technique,
2011
Missouri University of Science and Technology
Characterization Of Crushed Rock-Concrete Interface Behavior Through The Parallel Gradation Technique, Domenica Cambio, Xin Kang, Louis Ge
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The response of a soil-structure system subjected to monotonic or cyclic loading is influenced significantly by the mechanical behavior of soil-structure interface. in this paper, the friction characteristics of the crushed rock-concrete interface and the role of the crushed rock deformability were examined through a series of monotonic and cyclic direct shear tests. the physical modeling technique of parallel gradation was adopted where two parallel gradation curves of the crushed rocks were prepared and used in the tests. the tests were carried out in dry condition and with two initial void ratios representing both loose and dense states. Two concrete …
