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Articles 151 - 163 of 163
Full-Text Articles in Engineering
Undergraduate Summer Research In Structural Engineering, Norbert J. Delatte
Undergraduate Summer Research In Structural Engineering, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
For the last seven years, a summer Research Experiences for Undergraduates site in structural engineering, funded by the National Science Foundation, has operated at the University of Alabama at Birmingham. During this time, 33 students from 22 colleges and universities have participated in the site. Participants are recruited nationally and have come from as far away as California and Puerto Rico. The program is intended to provide students interested in graduate studies with an introduction to research methods, and to provide students who will not continue their studies past a bachelor of science in civil engineering with a better understanding …
C-Ring Strength Of Advanced Monolithic Ceramics, A. A. Wereszczak, R. J. Caspe, J. J. Swab, S. F. Duffy, E. H. Baker
C-Ring Strength Of Advanced Monolithic Ceramics, A. A. Wereszczak, R. J. Caspe, J. J. Swab, S. F. Duffy, E. H. Baker
Civil and Environmental Engineering Faculty Publications
Alumina, silicon carbide, silicon nitride, and zirconia are common candidate ceramics for load-bearing tubular components. To help facilitate design and reliability modeling with each ceramic, Weibull strength distributions were determined with each material using a diametrally compressed c-ring specimen in accordance with ASTM C1323. The investigated silicon nitride and zirconia were found to exhibit higher uncensored characteristic strengths than the alumina and silicon carbide. The occurrence of chamfer-located fracture initiation was problematic, and hindered the ability to generate valid design data in some of these ceramics. Fractography and stress modeling results suggest that some aspects of ASTM C1323 should be …
Using The Ltpp Database In A Pavement Design Course, Norbert J. Delatte
Using The Ltpp Database In A Pavement Design Course, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
The Strategic Highway Research Program Long Term Pavement Performance (LTPP) database provides considerable information about a large number of pavement test sections. The information may be easily accessed using DataPave 2.0 software, available free from the Federal Highway Administration. This software provides information on approximately 3,000 sections, with several modules for data analysis and extraction. This paper describes the integration of LTPP DataPave 2.0 software into a pavement design course. The database was used at several points throughout the course, including lessons on traffic characterization, materials, reliability, performance, and design. Twelve Texas pavement case studies were used. Each student was …
Agricultural Product Loads And Warehouse Failures, Norbert J. Delatte
Agricultural Product Loads And Warehouse Failures, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
Two manufactured metal building warehouses loaded with agricultural products failed in service. Inspection revealed considerable damage to the structure and the foundation. The building owner filed suit against the building supplier, the building erector, and the soils testing laboratory whose engineer had designed the foundation. The agricultural product imposed substantial outward lateral pressures on the walls of the structures. Review of the available design documents indicated that these loads had not been accounted for in design. A structural analysis revealed that elements of the structure were underdesigned for the agricultural product loads. In addition, the foundation did not have any …
Forensics And Case Studies In Civil Engineering Education: State Of The Art, Norbert J. Delatte, Kevin L. Rens
Forensics And Case Studies In Civil Engineering Education: State Of The Art, Norbert J. Delatte, Kevin L. Rens
Civil and Environmental Engineering Faculty Publications
This paper reviews the state of the art in the use of forensic engineering and failure case studies in civil engineering education. The study of engineering failures can offer students valuable insights into associated technical, ethical, and professional issues. Lessons learned from failures have substantially affected civil engineering practice. For the student, study of these cases can help place design and analysis procedures into historical context and reinforce the necessity of lifelong learning. Three approaches for bringing forensics and failure case studies into the civil engineering curriculum are discussed in this paper. These are stand-alone forensic engineering or failure case …
Closure To “Another Look At The L’Ambiance Plaza Collapse,” By Rachel Martin And Norbert J. Delatte, Norbert J. Delatte
Closure To “Another Look At The L’Ambiance Plaza Collapse,” By Rachel Martin And Norbert J. Delatte, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
No abstract provided.
Lessons From Roman Cement And Concrete, Norbert J. Delatte
Lessons From Roman Cement And Concrete, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
Although masonry and lime mortars had been used for centuries by earlier civilizations, the Romans were the first to extensively use naturally occurring volcanic earth to make hydraulic cement. The volcanic powder named “pulvis puteolanis,” found near the town of Puteoli near Naples (now Pozzouli), was used to build magnificent structures. The use of this hydraulic cement in masonry and concrete greatly expanded civil engineering possibilities. The Roman engineer Vitruvius, writing in The Ten Books on Architecture, described the careful materials selection, proportioning, and workmanship that was critical to the performance of Roman concrete. Masonry and coarse and fine …
Another Look At Hartford Civic Center Coliseum Collapse, Rachel Martin, Norbert J. Delatte
Another Look At Hartford Civic Center Coliseum Collapse, Rachel Martin, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
Only a few hours after five thousand basketball fans had left, the roof of the Hartford Civic Center Coliseum collapsed under a heavy snowfall. Fortunately, the arena was empty. The design of the space frame roof had been based on an innovative and extensive computer analysis. However, when deflections twice as great as those predicted by the computer analysis were observed during construction, the warning was ignored. Overconfidence in computer analysis results played a large part in this failure. A useful lesson from this case is that the computer is only an analytical tool and computed results must be checked …
Another Look At The L'Ambiance Plaza Collapse, Rachel Martin, Norbert J. Delatte
Another Look At The L'Ambiance Plaza Collapse, Rachel Martin, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
The collapse of the L'Ambiance Plaza building, under construction in Bridgeport, Conn., in 1987, killed 28 construction workers. A number of concurrent investigations were undertaken to attempt to determine the cause. At least six separate theories were developed. However, a prompt legal settlement kept these investigations from being completed. This paper reviews the collapse and discusses the competing theories. The failure focused controversy on the safety of the lift-slab construction method. Because there is a need in civil engineering education for case studies to illustrate ethical and professional issues as well as technical principles, this paper also addresses these aspects. …
Closure To Discussion: Failure Case Studies And Engineering Ethics In Engineering Mechanics Courses, Norbert J. Delatte
Closure To Discussion: Failure Case Studies And Engineering Ethics In Engineering Mechanics Courses, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
No abstract provided.
Investigating Performance Of Bonded Concrete Overlays, Norbert J. Delatte, David W. Fowler, B. Frank Mccullough, Stefan F. Gräter
Investigating Performance Of Bonded Concrete Overlays, Norbert J. Delatte, David W. Fowler, B. Frank Mccullough, Stefan F. Gräter
Civil and Environmental Engineering Faculty Publications
A bonded concrete overlay (BCO) is a concrete pavement rehabilitation method used to extend the life of an existing concrete pavement. The BCO should bond fully with the existing concrete, leading to a thicker composite pavement section, a much stiffer pavement, and a considerable decrease in pavement stresses. For one project, cost estimates for a BCO were half as much as for full-depth replacement of a pavement. In some cases BCOs have delaminated shortly after construction. This paper proposes a framework for identifying the causes of early age delamination in BCOs. The early age behavior of newly constructed BCOs is …
Failure Case Studies And Ethics In Engineering Mechanics Courses, Norbert J. Delatte
Failure Case Studies And Ethics In Engineering Mechanics Courses, Norbert J. Delatte
Civil and Environmental Engineering Faculty Publications
Often, engineering students do not study engineering failures or discuss ethics until they take upper division undergraduate courses or graduate level courses. One drawback to this approach is that problems analyzed in introductory courses are often contrived, uninteresting, and bear little relation to the problems encountered in engineering practice. At the point when educators need to grab the student's interest in engineering most, they should show the excitement and relevance of the profession. Another is that the students encounter the issues of ethics, responsibility, and accountability that are often highlighted by a failure, late in their engineering education. As a …
Noninteractive Macroscopic Reliability Model For Ceramic Matrix Composites With Orthotropic Material Symmetry, Stephen F. Duffy, Jane M. Manderscheid
Noninteractive Macroscopic Reliability Model For Ceramic Matrix Composites With Orthotropic Material Symmetry, Stephen F. Duffy, Jane M. Manderscheid
Civil and Environmental Engineering Faculty Publications
A macroscopic noninteractive reliability model for ceramic matrix composites is presented. The model is multiaxial and applicable to composites that can be characterized as orthotropic. Tensorial invariant theory is used to create an integrity basis with invariants that correspond to physical mechanisms related to fracture. This integrity basis is then used to construct a failure funciton per unit volume (or area) of material. It is assumed that the overall strength of the composite is governed by weakest link theory. This leads to a Weibull type model similar in nature to the principle of independent action (PIA) model for isotropic monolithic …