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Articles 3061 - 3090 of 3546
Full-Text Articles in Architecture
Biological Fixed Film Systems, Mark W. Fitch, Ellen England
Biological Fixed Film Systems, Mark W. Fitch, Ellen England
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Behavior Of Screw Connections In Residential Construction, Roger A. Laboube, M. A. Sokol
Behavior Of Screw Connections In Residential Construction, Roger A. Laboube, M. A. Sokol
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Self-drilling screws are the primary means of fastening cold-formed steel members in residential construction. Because the fabrication of connections is the most labor-intensive aspect of the construction process, a better understanding of the behavior of screw connections could lead to more optimum connection design. Therefore, studies have been performed at the University of Missouri-Rolla aimed at developing a better understanding of the behavior of single-shear connections using self-drilling screws in cold-formed steel construction. The study's focus was on design parameters typically employed in residential construction. Fastener patterns, screw spacing, stripped screws, and the number of screws in a connection was …
Optimal Placement Of Dampers And Actuators Based On Stochastic Approach, Franklin Y. Cheng, Hongping Jiang, Xiaozhe Zhang
Optimal Placement Of Dampers And Actuators Based On Stochastic Approach, Franklin Y. Cheng, Hongping Jiang, Xiaozhe Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A general method is developed for optimal application of dampers and actuators by installing them at optimal location on seismic-resistant structures. The study includes development of a statistical criterion, formulation of a general optimization problem and establishment of a solution procedure. Numerical analysis of the seismic response in time-history of controlled structures is used to verify the proposed method for optimal device application and to demonstrate the effectiveness of seismic response control with optimal device location. This study shows that the proposed method for the optimal device application is simple and general, and that the optimally applied dampers and actuators …
Smooth Static And Dynamic Indentation Of A Cantilever Beam, Minggang Zhou, William P. Schonberg
Smooth Static And Dynamic Indentation Of A Cantilever Beam, Minggang Zhou, William P. Schonberg
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The static and dynamic indentation of structural elements such as beams and plates continue to be intriguing problems, especially for scenarios where large area contacts are expected to occur. Standard methods of indentation analyses use a beam theory solution to obtain an overall load-displacement relationship and then a Hertzian contact solution to calculate local stresses under the indenter. However, these techniques are only applicable in a fairly limited class of problems: the stress distribution in the contact region will differ significantly from a Hertzian one when the contact length exceeds the thickness of the beam. The indentation models developed herein …
Practical Issues For The Application Of High-Performance Concrete To Highway Structures, John J. Myers, Yumin Yang
Practical Issues For The Application Of High-Performance Concrete To Highway Structures, John J. Myers, Yumin Yang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In recent years, the advantages of high-performance concrete (HPC) have been well documented. Among others, these advantages include enhanced design flexibility and improved durability performance that results in reduced maintenance costs and an increased service life. Despite these obvious benefits, the implementation of HPC has been very slow. This can be attributed to several factors including the uncertainty related to current design codes and a lack of familiarity of designers and contractors with practices and requirements for proper design and construction of high-performance concrete structures. This paper introduces and discusses several fundamental issues that affect the implementation of HPC and …
Pilot Study: Lateral Braced C-Sections Under Bending, B. Beshara, Roger A. Laboube
Pilot Study: Lateral Braced C-Sections Under Bending, B. Beshara, Roger A. Laboube
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The overall behavior under uniform load of cold-formed steel C-sections assemblies was investigated. Each test assembly consisted of C-sections acting as beams having a track section to restrain its ends. A lateral brace to restrain the C-sections from rotation was provided at mid-span. To better understand the influence of the brace on the flexural behavior, an experimental investigation was carried out with particular emphasis placed on the study of the effect of the mid-span brace connection when wallboard was attached to the tension flange. The tested moment capacities are compared to predictions based on the 1996 edition American Iron and …
Evaporative Cooling Availability In Water Based Sensible Cooling Systems, Ben Costelloe, Donal Finn
Evaporative Cooling Availability In Water Based Sensible Cooling Systems, Ben Costelloe, Donal Finn
Conference Papers
Recent developments have prompted a review of evaporative cooling technology as an effective means of cooling modern deep plan buildings. Prominent among these developments is the success of high temperature sensible cooling systems, such as chilled ceilings, which require a supply of cooling water at 14 to 18°C. Crucial to the success of evaporative cooling technology, as a significant means of cooling in modern applications, is the ability to generate cooling water, in an indirect circuit, at a temperature which closely approaches the ambient adiabatic saturation temperature or wet bulb temperature. Recent research in this area has shown that it …
Wku Capital Construction Update, Wku Board Of Regents
Wku Capital Construction Update, Wku Board Of Regents
Board of Regents Documents
Presentation booklet regarding capital construction projects with photographs. Projects included:
- Glasgow Regional Postsecondary Education Center
- Elizabethtown Regional Postsecondary Education Center
- Media & Technology Center / Guthrie Tower & Plaza
- Science & Engineering Building
- Downing University Center Renovations
- University Boulevard Pedestrian Bridge
E.A. Diddle Arena Project, Wku Board Of Regents
E.A. Diddle Arena Project, Wku Board Of Regents
Board of Regents Documents
Presentation booklet regarding Diddle Arena renovation project financing through bond issue. Includes contracts, revenue sources, insurance, deed descriptions and model procurement codes.
Benzene Toxicity And Removal In Laboratory Phytoremediation Studies, Joel Gerard Burken, Carla Ross, Lisa M. Harrison, Adrian Marsh, Lars Zetterstrom, Juel S. Gibbons
Benzene Toxicity And Removal In Laboratory Phytoremediation Studies, Joel Gerard Burken, Carla Ross, Lisa M. Harrison, Adrian Marsh, Lars Zetterstrom, Juel S. Gibbons
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Hybrid Poplar Cuttings Were Shown to Impact the Fate and Transport of Subsurface Benzene, While Toxicity to the Poplars Was Not Observed. Laboratory Experiments Investigated the Toxicity Response of Poplar Cuttings to Benzene Exposure, Contaminant Distribution in Plant Tissues, Contaminant Degradation in the Soil Profile, and Contaminant Volatilization from the Soil and Plant Tissues. Two Separate Studies Were Conducted to Evaluate These Parameters. the First Study Examined the Toxicity of Benzene to Hybrid Poplar Cuttings in Batch Reactors. Poplar Cuttings Were Exposed to Various Concentrations of Benzene Contaminated Water in Two Different Types of Soil. Transpiration Rates Were Measured as …
Asymmetric Low-Velocity Impact Of A Finite Layer, Minggang Zhou, William P. Schonberg
Asymmetric Low-Velocity Impact Of A Finite Layer, Minggang Zhou, William P. Schonberg
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The dynamic indentation of structural elements such as beams and plates continues to be an intriguing problem, especially for scenarios where large area contacts can occur. Standard methods of indentation analysis typically use a dynamic beam theory solution to obtain an overall load-displacement relationship and then a Hertzian contact solution to determine local stresses under the impactor. However, previous static and dynamic modeling efforts have shown that the stress distribution in the contact region will differ significantly from a Hertzian one when the contact length exceeds the thickness of the beam. In such cases point contact can no longer be …
Diagnostic Load Testing Of Two-Way Posttensioned Concrete Slab, Antonio Nanni, M. Mettemeyer
Diagnostic Load Testing Of Two-Way Posttensioned Concrete Slab, Antonio Nanni, M. Mettemeyer
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Diagnostic load testing techniques have been used to verify in situ that existing structures have the required load-carrying capacity. This paper discusses the diagnostic load testing and finite-element modeling of a two-way posttensioned concrete slab with the purpose of illustrating the features of this full-scale testing method. The slab was modeled using a commercial finite-element package and the results were verified experimentally. The test loads were applied using hydraulic jacks. Negative internal bending moments were generated at critical locations equivalent to those produced by a 92 psf (4.40 kPa) superimposed uniformly distributed load. Positive internal bending moments were also produced …
Strain Rate And Aging Effect On The Mechanical Properties Of Sheet Steels, Chi Ling Pan, Shaojie Wu, Wei Wen Yu
Strain Rate And Aging Effect On The Mechanical Properties Of Sheet Steels, Chi Ling Pan, Shaojie Wu, Wei Wen Yu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This study was primarily involved with the experimental determination of the dynamic mechanical properties of five different sheet steels. The nominal yield strengths of these five types of sheet steels ranged from 172 to 690 MPa (25-100 ksi) and the range of strain rates varied from 10-4 to 1.0 mm/mm/s. All these five materials were studied in both longitudinal and transverse directions under various strain rates, and some materials were also tested under different strain rates and different amounts of prior cold stretching. In addition, two types of steels were tested to estimate the aging effect on the mechanical properties …
Self-Monitoring, Pseudo-Ductile, Hybrid Frp Reinforcement Rods For Concrete Applications, C. E. Bakis, Antonio Nanni, J. A. Terosky, S. W. Koehler
Self-Monitoring, Pseudo-Ductile, Hybrid Frp Reinforcement Rods For Concrete Applications, C. E. Bakis, Antonio Nanni, J. A. Terosky, S. W. Koehler
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The feasibility of hybrid -fiber-reinforced-polymer rods that demonstrate the important safety features of self-monitoring capability and pseudo-ductility is demonstrated. The rods are intended to be the basis of improved pultruded reinforcements for concrete or other civil applications where safety is of critical importance. The lowest elongation fiber in the seven rods investigated is carbon, which by virtue of its piezo resistivity allows the monitoring of deformation and fracture throughout an entire rod with simple electronic equipment. Resistance measurements obtained during quasi-static tests clearly reveal failure of the carbon fibers. Following this easily detected event, higher loads can be safely sustained …
Characterization Of Frp Rods As Near-Surface Mounted Reinforcement, Laura De Lorenzis, Antonio Nanni
Characterization Of Frp Rods As Near-Surface Mounted Reinforcement, Laura De Lorenzis, Antonio Nanni
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The use of near surface mounted (NSM) fiber-reinforced polymer (FRP) rods is a promising technology for increasing flexural and shear strength of deficient reinforced concrete (RC) members. As this technology emerges, the structural behavior of RC elements strengthened with NSM FRP rods needs to be fully characterized. Given the variability of material properties and groove geometry, this requires that the tensile properties of the FRP rod and the mechanics of load transfer between NSM FRP rods and concrete be investigated. Tensile and bond tests on commercially available carbon FRP deformed rods for application as NSM reinforcement were carried out using …
Motorized Insulated Damper Assembly For Furnace Systems, William Max Kirk, Timothy Wentz
Motorized Insulated Damper Assembly For Furnace Systems, William Max Kirk, Timothy Wentz
Durham School of Architectural Engineering and Construction: Faculty Publications
A damper unit is provided that is adapted to be positioned in a furnace duct line. The damper unit has a housing which is in communication with a fresh air source and a furnace system. The housing has a damper blade which is moveable between an open position which allows air flow through the housing and a closed position which prevents air flow through the housing. The blade is coupled with a Solenoid so that when the Solenoid is activated the blade is moved to an open position allowing air flow through the housing. Further, a fan is located in …
2001 - The Sixth Annual Symposium Of Student Scholars
2001 - The Sixth Annual Symposium Of Student Scholars
Symposium of Student Scholars Program Books
The full program book from the Sixth Annual Symposium of Student Scholars, held on March 30, 2001. Includes abstracts from the presentations and posters.
Yield Moment Of Cold-Formed Steel Beams Under Different Strain Rates, Chi Ling Pan, Wei Wen Yu
Yield Moment Of Cold-Formed Steel Beams Under Different Strain Rates, Chi Ling Pan, Wei Wen Yu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
It has been recognized that the mechanical properties of sheet steels and the structural strength of cold-formed steel members can be influenced by strain rate. For studying the local and post buckling behavior of stiffened and unstiffened compression elements under a dynamic loading condition, 60 beams, which were assembled from the same material, have been tested under different strain rates. To study the structural behavior of hybrid cold-formed steel beams, a total of 72 specimens was investigated. The results showed that the strength of beams increases with increasing strain rates. The amount of increase was found to be dependent on …
Editor’S Note Advancement Of Phytoremediation, Joel Gerard Burken
Editor’S Note Advancement Of Phytoremediation, Joel Gerard Burken
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.