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Articles 1921 - 1950 of 2166
Full-Text Articles in Civil and Environmental Engineering
The History Of The Trinity Highway: A Study In Transportation Dynamics, Richard Wilutus
The History Of The Trinity Highway: A Study In Transportation Dynamics, Richard Wilutus
Books and Other Publications
Although the primary focus of this thesis is a history of California 299--the Trinity Highway, I have studied the construction of that road in the context of the history of transportation between Weaverville and Humboldt Bay. The history of a transportation network is not only a history of connections between people and places but also, in this remote region, the vital link connecting wilderness with civilization.
Ever since the settlement of the Weaverville area in 1848, its residents have sought reliable transportation to Humboldt Bay's seaport and merchandise. During this period a road has connected these two places for less …
Seal Forces In Structural Glazing Systems, C. V.Girija Vallabhan, Gee D. Chou, Joseph E. Minor
Seal Forces In Structural Glazing Systems, C. V.Girija Vallabhan, Gee D. Chou, Joseph E. Minor
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Silicone sealants are used as structural connections between the two glass plates in an insulating glass (IG) unit and between the IG unit and the supporting mullion. These connections become an integral part of the entire glazing system, worthy of attention by structural design engineers. Since the behavior of IG units subjected to lateral pressures, such as wind, is highly nonlinear, von Karman plate equations are employed in the mathematical model developed here. Also, since the two thin glass plates are separated by a sealed air space, a complex interaction occurs between the trapped air space and the glass plates. …
Aisi Lrfd Method For Cold-Formed Steel Structural Members, Ling En Hsiao, Wei-Wen Yu, Theodore V. Galambos
Aisi Lrfd Method For Cold-Formed Steel Structural Members, Ling En Hsiao, Wei-Wen Yu, Theodore V. Galambos
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In the design of steel buildings, the allowable stress design (ASD) method has long been used for cold-formed steel structural members in the United States Recently, the load and resistance factor design (LRFD) criteria have been developed for steel buildings using hot-rolled shapes and built-up members fabricated from steel plates In order to develop load and resistance factor design (LRFD) criteria for cold-formed steel structural members, a joint research project is conducted at the University of Missouri-Rolla, Washington University, and the University of Minnesota under the sponsorship of the American Iron and Steel Institute Based on the 1986 edition of …
Optimum Assessment Of Irregular Three-Dimensional Seismic Buildings, Kevin Z. Truman, Franklin Y. Cheng
Optimum Assessment Of Irregular Three-Dimensional Seismic Buildings, Kevin Z. Truman, Franklin Y. Cheng
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A structural optimization algorithm based on an optimality criteria approach is presented for three-dimensional, statically and dynamically loaded steel or reinforced concrete structures. The theoretical work is presented in terms of scaling, sensitivity analyses, optimality criteria, and Lagrange multiplier determination. The structures can be subjected to a combination of static and dynamic displacement and stress, and natural frequency constraints. The dynamic analyses are based upon the ATC-03 provisions for equivalent lateral force and modal analysis procedures, or multicomponent response spectra modal analyses. Using the algorithm presented, a computer program called ODRESB-3D was developed for analysis and design of various building …
Cost Comparison Of Timber, Steel, And Prestressed Concrete Bridges, Richard A. Behr, E. J. Cundy, C. H. Goodspeed
Cost Comparison Of Timber, Steel, And Prestressed Concrete Bridges, Richard A. Behr, E. J. Cundy, C. H. Goodspeed
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This study was undertaken to investigate the economics of timber bridge superstructures versus traditional steel/concrete and prestressed concrete alternatives in the short-span range of 20 to 60 ft (6.1-18.3 m). Only superstructure costs were considered because substructure and abutment costs are highly site-specific. A lack of definitive data regarding service lives and maintenance costs precluded a life-cycle cost study; thus, only initial costs were compared. Representative superstructure designs were obtained for timber, steel/concrete, and prestressed concrete bridges at 20-, 40-, and 60-ft spans. Five to six northern New England general contractors performed cost estimates on these designs. Also, nine timber …
Revised Method Of Approximate Structural Analysis, Richard A. Behr, E. J. Grotton, C. A. Dwinal
Revised Method Of Approximate Structural Analysis, Richard A. Behr, E. J. Grotton, C. A. Dwinal
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Failure Strengths Of Laminated Glass, Joseph E. Minor, Patrick L. Reznik
Failure Strengths Of Laminated Glass, Joseph E. Minor, Patrick L. Reznik
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Laminated glass used in architectural glazing comprises two layers of glass connected by a thin interlayer of polyvinyl butyral. Previously reported nondestructive experimental stress analyses offer evidence that laminated glass behaves like monolithic glass of the same nominal thickness except when temperatures are high. This evidence has been augmented to include failure behavior by destructive tests of a large number of laminated-glass specimens. Test results reveal that failure strengths of annealed laminated-glass specimens are equal to failure strengths of annealed monolithic glass specimens of the same nominal thickness at room temperature and decrease to about 75% of monolithic-glass strength at …
Lateral Load Behavior Of Pile Group In Sand, Shamsher Prakash
Lateral Load Behavior Of Pile Group In Sand, Shamsher Prakash
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Knowledge-Based Prototype For Improving Scheduling Productivity, Colin Othniel Benjamin, Daniel L. Babcock, N. B. Yunus, John B. Kincaid
Knowledge-Based Prototype For Improving Scheduling Productivity, Colin Othniel Benjamin, Daniel L. Babcock, N. B. Yunus, John B. Kincaid
Engineering Management and Systems Engineering Faculty Research & Creative Works
The development of efficient construction plans and schedules presents continuing challenges to construction schedulers. Knowledge-based systems offer considerable potential as computer-based planning tools to aid the development of realistic project plans and schedules. This paper outlines the development of a knowledge-based prototype system for construction planning and scheduling and evaluates its effectiveness as a tool for improving the productivity of inexperienced construction project schedulers. The prototype, developed using the M.1 knowledge engineering shell, incorporates data bases, algorithm, and heuristics that mimic the decision process of expert construction project schedulers and identifies a work breakdown structure and precedence relationships. Inexperienced schedulers …
Seely & Titlow Co. Building, Susie Van Kirk
Seely & Titlow Co. Building, Susie Van Kirk
Susie Van Kirk Papers
The building under consideration for historic designation is only part of what once constituted the Seely & Titlow Co. complex which included retail stores, offices, stockrooms, barns, and warehouses. A brief history of the business and the other buildings is necessary for understanding the history and significance of the 10th and I Street building.
Sludge Digestion By Anaerobic Fluidized Beds. Ii: Kinetic Model, Bill T. Ray, Ju-Chang Huang, Brian A. Dempsey
Sludge Digestion By Anaerobic Fluidized Beds. Ii: Kinetic Model, Bill T. Ray, Ju-Chang Huang, Brian A. Dempsey
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A model has been developed to describe the gas production and soluble-COD variations from the digestion of waste-activated sludge in the anaerobic fluidized-bed reactor. It indicates that a substantial rate increase can be attained by prehydrolysis of the biological sludge, external to the reactor. The model indicates that the rate-limiting step is in the sludge hydrolysis. The model is developed from an assumption of first-order kinetics in a set of series and parallel, irreversible reactions. That is, the formation of soluble substrate is first order with respect to the particulate biomass present, and that the production of methane is first …
Sludge Digestion By Anaerobic Fluidized Beds. I: Lab Performance Data, Ju-Chang Huang, Bill T. Ray, Yao Jiang Huang
Sludge Digestion By Anaerobic Fluidized Beds. I: Lab Performance Data, Ju-Chang Huang, Bill T. Ray, Yao Jiang Huang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This study was undertaken to evaluate the laboratory performance of the anaerobic fluidized bed digesting secondary biological sludge at 35° C with four hydraulic-retention times (HRTs): 1, 2.5, 5, and 10 days. In addition, the effects of both operating temperature (15° C, 25° C and 35° C) and the initial sludge solubilization on the digester performance were also examined. It was found that at 35° C, an adequate degree of sludge digestion was obtainable with an HRT of only 1-2 days if the influent biological sludge was presolubilized by treatment with 17.5 meq/L of sodium hydroxide. If no presolubilization was …
Cyclic Lateral Loading Of A Large-Scale Pile Group, Shamsher Prakash, K. Sreerama, Sally Prakash
Cyclic Lateral Loading Of A Large-Scale Pile Group, Shamsher Prakash, K. Sreerama, Sally Prakash
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Web-Crippling Strength Of Cold-Formed Steel Beams, C. Santaputra, M. B. Parks, Wei-Wen Yu
Web-Crippling Strength Of Cold-Formed Steel Beams, C. Santaputra, M. B. Parks, Wei-Wen Yu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The structural behavior of high-strength cold-formed steel beams subjected primarily to web crippling is investigated analytically and experimentally. Hat sections and I-beams, formed from five different types of high-strength sheet steels, are investigated under various loading conditions. In addition to the test data gathered in this phase of study, the experimental results obtained from the beam tests conducted at various companies are carefully evaluated. The evaluation indicates that the present available design criteria are not suitable for high-strength materials with yield strengths exceeding 80 ksi (552 MPa). New design formulas are derived for different types of loading conditions on the …
Recursive Optimization For Seismic Steel Frames, Franklin Y. Cheng, D. S. Juang
Recursive Optimization For Seismic Steel Frames, Franklin Y. Cheng, D. S. Juang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The theoretical derivations and numerical procedures used in the computer program ODSEWS-2D-II for the analysis and optimum design of two-dimensional regular and irregular steel frames subjected to static, earthquake, and wind forces are presented. The seismic input can be interacting ground motions of actual earthquake records, various response spectra, and different building provisions of the Uniform Building Code (UBC), ATC-03 in the United States, and TJ-11 in China. Included are the mathematical formulation based on the consistent mass and the displacement method with consideration of geometric nonlinearity, three levels of recursive optimization procedures, the objective function of minimum construction and …
Permeability Of Clays Under Organic Permeants, Janardanan O. Uppot, Richard Wesley Stephenson
Permeability Of Clays Under Organic Permeants, Janardanan O. Uppot, Richard Wesley Stephenson
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A Magnesium Montmorillonite and a Kaolinite Clay Are Subjected to Organic and Inorganic Permeants to Study the Changes in Permeability Caused by the Reaction between Clays and Permeants. the Permeants Are Acetic Acid, Aniline, Methanol, and Xylene. Tests Are Conducted in Specially Designed and Constructed Flexible Wall Permeameters that Provide Precise Measurements of Pressures and Flows. Increases in Clay Permeability Due to Clay-Permeant Chemical Reactions Are Measured to Be on the Order of Two to Three Times the Original Permeability. This is in Contrast to the 100 to 1,000 Times Increases Reported by Others. the Writers Believe that the Large …
Optimal Design Rules Applied To The Design Of High-Speed Mechanisms Under Deflection And Stress Constraints, Frank W. Liou, Jenny Liu
Optimal Design Rules Applied To The Design Of High-Speed Mechanisms Under Deflection And Stress Constraints, Frank W. Liou, Jenny Liu
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Presented in this paper are two approaches for the design of flexible mechanisms under stress and deflection constraints. Based on the optimality conditions derived in this paper, two procedures are developed to design the minimum weight of mechanisms subject to stress and deflection limitations. The first procedure is the improvement of Thornton's design process r 17), and the second procedure is based on the interpolation technique. Several design examples are also presented to demonstrate these methods.