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Articles 1 - 30 of 191
Full-Text Articles in Engineering
Corrosion Of Galvanized Fasteners: Appendix, Steel Framing Alliance
Corrosion Of Galvanized Fasteners: Appendix, Steel Framing Alliance
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Novel Processing Of Hydroxyapatite-Zirconia Composites Using Nano-Sized Particles, Mark R. Towler, I. R. Gibson, S. M. Best
Novel Processing Of Hydroxyapatite-Zirconia Composites Using Nano-Sized Particles, Mark R. Towler, I. R. Gibson, S. M. Best
Chemical and Biochemical Engineering Faculty Research & Creative Works
A method to produce composites of hydroxyapatite (HA) with ZrO2 (Y-TZP) additions between 0 and 10 wt % at a low sinter temperature of 750 °C is presented. The method limits the amount of reaction between the HA and ZrO2. A ZrO2 loading level that would improve strength while limiting the decomposition of the HA is studied.
Simplified Window Glass Design Procedure, H. Scott Norville, Joseph E. Minor
Simplified Window Glass Design Procedure, H. Scott Norville, Joseph E. Minor
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper presents a simplified window glass design procedure (SWGDP) as an alternative to the comprehensive window glass design procedure described in ASTM E 1300, `Standard practice for determining the load resistance of glass in buildings.' Although ASTM E 1300 provides a technically robust treatment of the strength of window glass and window glass constructions, architects and engineers will find ASTM E 1300 difficult to use. The SWGDP presented herein uses the same failure prediction methodology to characterize the annealed window glass strength that underlies ASTM E 1300. By reducing the number of basic glass strength charts to one, the …
Design Methods For Auger Cip Piles In Compression, Giuliana A. Zelada, Richard Wesley Stephenson
Design Methods For Auger Cip Piles In Compression, Giuliana A. Zelada, Richard Wesley Stephenson
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This Paper Reports on a Study of 43 Compression Load Tests (Five Fully Instrumented) and Ten Pullout Tests of Auger Cast-In-Place (ACIP) Piles in Sand. Eight Design Methods Reported in the Literature Were Used to Predict the Measured Pile Capacities. Ultimate Load Capacities of the ACEP Load Tests Were Determined using Two Different Definitions of Ultimate Capacity and Compared with Predictions. Load Transfer Behavior Was Determined from a Study of the Fully Instrumented Pile Tests and Compared to Predicted Values. Recommendations Are Made Regarding the Design Approach Most Appropriate for These Foundations and the Best Procedure for Estimating Ultimate Capacity …
Electrical Conductivity Of Nanocrystalline Ceria And Zirconia Thin Films, Igor Kosacki, Toshio Suzuki, Vladimir Petrovsky, Harlan U. Anderson
Electrical Conductivity Of Nanocrystalline Ceria And Zirconia Thin Films, Igor Kosacki, Toshio Suzuki, Vladimir Petrovsky, Harlan U. Anderson
Materials Science and Engineering Faculty Research & Creative Works
The results of studies of the preparation, structure and electrical conductivity of ZrO2:16% Y and CeO2 thin films are presented. Dense films with grain size controlled in the region of 1-400 nm have been obtained on monocrystalline sapphire and polycrystalline Al2O3 substrates using a polymeric precursor spin coating method. The electrical conductivity of nanocrystalline thin films has been studied as a function of oxygen activity and temperature and correlated with the microstructure. Nanocrystalline specimens are characterized by enhanced electrical conductivity and different stoichiometry compared with microcrystalline material.
Nonlinear Parameter Estimation Of Excitation Systems, Rajeev Bhaskar, Mariesa Crow, Eric Ludwig, Kelvin T. Erickson, Kirit S. Shah
Nonlinear Parameter Estimation Of Excitation Systems, Rajeev Bhaskar, Mariesa Crow, Eric Ludwig, Kelvin T. Erickson, Kirit S. Shah
Electrical and Computer Engineering Faculty Research & Creative Works
This paper details the nonlinear parameter estimation process of an IEEE AC1A type exciter using time-domain system identification techniques. This paper discusses nonlinear parameter estimation techniques, systematic and random noise mitigation strategies, and system validation. This study establishes a strong basis for excitation system parameter estimation.
Voltage Stability Analysis: V-Q Power Flow Simulation Versus Dynamic Simulation, Badrul H. Chowdhury, C. W. Taylor
Voltage Stability Analysis: V-Q Power Flow Simulation Versus Dynamic Simulation, Badrul H. Chowdhury, C. W. Taylor
Electrical and Computer Engineering Faculty Research & Creative Works
Several analysis methods are available for long-term voltage stability. The V-Q curve power flow method is widely used by Western Systems Coordinating Council utilities, and has some advantages. Long-term dynamic simulation with proper modeling, however, is clearly the most accurate simulation method. The authors compare the two methods for wintertime voltage stability problems in the Portland, Oregon, USA, load area. Results from the V-Q method can be misleading. The same is true of other power flow program based analysis employing conventional modeling. Results from these power flow methods may be pessimistic, causing overdesign or overly conservative operation.
Rhizosphere Competitiveness Of Trichloroethylene-Degrading, Poplar-Colonizing Recombinant Bacteria, Hojae Shim, Sadhana Chauhan, Doohyun Ryoo, Kally Bowers, Stuart M. Thomas, Keith A. Canada, Thomas K. Wood, Joel Gerard Burken
Rhizosphere Competitiveness Of Trichloroethylene-Degrading, Poplar-Colonizing Recombinant Bacteria, Hojae Shim, Sadhana Chauhan, Doohyun Ryoo, Kally Bowers, Stuart M. Thomas, Keith A. Canada, Thomas K. Wood, Joel Gerard Burken
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Indigenous bacteria from poplar tree (Populus canadensis var. eugenei `Imperial Carolina') and southern California shrub rhizospheres, as well as two tree-colonizing Rhizobium strains (ATCC 10320 and ATCC 35645), were engineered to express constitutively and stably toluene o-monooxygenase (TOM) from Burkholderia cepacia G4 by integrating the tom locus into the chromosome. The poplar and Rhizobium recombinant bacteria degraded trichloroethylene at a rate of 0.8 to 2.1 nmol/min/mg of protein and were competitive against the unengineered hosts in wheat and barley rhizospheres for 1 month (colonization occurred at a level of 1.0 × 105 to 23 × 105 …
Detection Of Solid Pigment In Dermatoscopy Images Using Texture Analysis, Murali Anantha, William V. Stoecker, Randy Hays Moss
Detection Of Solid Pigment In Dermatoscopy Images Using Texture Analysis, Murali Anantha, William V. Stoecker, Randy Hays Moss
Chemistry Faculty Research & Creative Works
Background/aims: Epiluminescence microscopy (ELM), also known as dermoscopy or dermatoscopy, is a non-invasive, in vivo technique, that permits visualization of features of pigmented melanocytic neoplasms that are not discernable by examination with the naked eye. ELM offers a completely new range of visual features. One such feature is the solid pigment, also called the blotchy pigment or dark structureless area. Our goal was to automatically detect this feature and determine whether its presence is useful in distinguishing benign from malignant pigmented lesions.
Methods: Here, a texture-based algorithm is developed for the detection of solid pigment. The factors d and a …
High Strain Rate Superplasticity In Microcrystalline And Nanocrystalline Materials, S. X. Mcfadden, A. V. Sergueeva, Rajiv S. Mishra, A. K. Mukherjee
High Strain Rate Superplasticity In Microcrystalline And Nanocrystalline Materials, S. X. Mcfadden, A. V. Sergueeva, Rajiv S. Mishra, A. K. Mukherjee
Materials Science and Engineering Faculty Research & Creative Works
Superplasticity has evolved to become a significant industrial forming process. The phenomenon of superplasticity is explored at high strain rates where it is economically more attractive. True tensile superplasticity has been demonstrated in nanocrystalline materials. The difference in the details of superplasticity between the nanocrystalline and microcrystalline state is emphasised.
Experimental Investigation Of Cold-Formed Steel Beam-Column Sub-Frames: Pilot Study, M. F. Wong, K. F. Chung
Experimental Investigation Of Cold-Formed Steel Beam-Column Sub-Frames: Pilot Study, M. F. Wong, K. F. Chung
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents the findings of an experimental investigation on the structural performance of bolted moment connections in cold-formed steel beam-column sub-frames. A total of eight tests with three different connection configurations in both internal and external columns were carried out. Double lipped C-sections back-to-back with hot rolled steel gusset plates of 10 mm and of 16 mm in two different shapes were tested; four bolts per member were used in the connections. Among the tests, three different modes of failure were identified and the measured moment resistances at the connections were found to vary from 36% to 97% of …
Fire Resistance Of Loadbearing Lsf Assemblies, Farid Alfawakhiri, Mohamed A. Sultan
Fire Resistance Of Loadbearing Lsf Assemblies, Farid Alfawakhiri, Mohamed A. Sultan
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents an analytical thermal-structural model for loadbearing lightweight steel framed (LSF) walls exposed to fire on one side. The model reflects temperature and deformation data from six standard fire resistance tests conducted recently by the National Research Council of Canada in partnership with the North American steel industry. Some characteristic patterns in thermal transmission and structural behaviour are discussed. Temperature histories across LSF assemblies are simulated numerically by explicit integration of transient heat transfer equations. The apparent thermal properties are calibrated for gypsum board and three types of insulation. Analytical procedures are presented to simulate lateral deformation histories …
A General Design Rule For Bearing Failure Of Bolted Connections Between Cold-Formed Steel Strips, K. F. Chung, K. H. Ip
A General Design Rule For Bearing Failure Of Bolted Connections Between Cold-Formed Steel Strips, K. F. Chung, K. H. Ip
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents the results of a finite element investigation on the structural performance of cold-formed steel bolted connections. A parametric study on various connection configurations was performed to relate the bearing resistances of cold-formed steel bolted connections with steel strengths and thicknesses, and bolt diameters. A semi-empirical design rule for bearing resistances of bolted connections based on finite element results is proposed in which the bearing resistances are directly related with the design yield strength, and the design tensile strength of steel strips, steel thickness, and also with bolt diameters. Design expressions for resistance contributions due to both bearing …
Evaluation Of Cold-Formed Steel Connections Attached With Pneumatically Driven Pins, Wimal Suaris, Stuart Werner Baur
Evaluation Of Cold-Formed Steel Connections Attached With Pneumatically Driven Pins, Wimal Suaris, Stuart Werner Baur
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A comprehensive experimental study was conducted to examine the shear and tensile strength of pneumatically driven pin connections used in cold-formed steel construction. This study included the key parameters that influence the connection strength: steel thickness (16-, 18- and 20-gauge steel), sheathing thickness (1/2" Unipan and 1/2" Dens-Glass Gold). The shear design values given in the AlSI design specifications for screw connections are compared with those obtained from a series of lap shear tests and a good agreement is obtained. Initial analysis of the AlSI design equation for tensile failure due to pull-over yielded poor results when compared to the …
Lessons From Recent Collapses Of Metal Buildings, David B. Peraza
Lessons From Recent Collapses Of Metal Buildings, David B. Peraza
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents case studies of three roof collapses of metal buildings, discusses the most signigicant features of each case, and summarizes lessons learned that can be used to reduce future failures.
Estimation Of Restraint Forces For Z-Purlin Roofs Under Gravity Loads, M. C. Neubert, Thomas M. Murray
Estimation Of Restraint Forces For Z-Purlin Roofs Under Gravity Loads, M. C. Neubert, Thomas M. Murray
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The current specification provisions for the prediction of lateral restraint forces in Z-purlin supported roof systems under gravity loads are in Section D3.1 of the 1996 AlSI Specification for the Design of Cold-Formed Steel Structural Members (1996). The provisions need refinement, because they are empirical, have an incorrect treatment of roof slope and system effects, and ignore the effect of panel stiffness on restraint forces. Therefore, a new restraint force design procedure, having a stronger reliance on engineering principles, is proposed. Elastic stiffness models, with varying roof slope, panel stiffness, and cross-sectional properties, were used to develop the procedure. A …
Compression Tests On Cold-Formed Angles Loaded Parallel With A Leg, Dan Popovic, Kim J. R. Rasmussen, Gregory J. Hancock
Compression Tests On Cold-Formed Angles Loaded Parallel With A Leg, Dan Popovic, Kim J. R. Rasmussen, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes a series of compression tests on cold-formed equal angles with slender cross-section. The angles were tested between pinned ends and loaded axially with eccentric load which caused bending parallel with a leg. The test data are compared with the design rules of the Australian and American specifications for cold-formed and hot-rolled steel structures, as well as the ASCE Standard for the Design of Latticed Steel Transmission Structures. The rules of the specifications for cold-formed steel structures (AS/NZS4600 and AlSI) are shown to be very conservative. The cause of the conservatism is explained and improved design rules are …
On The Structural Behavior Of Composite Beams Using Cold-Formed Shapes, Maximiliano Malite, Walter A. Nimir, Jose Jairo De Sales, Roberto Martins Goncalves
On The Structural Behavior Of Composite Beams Using Cold-Formed Shapes, Maximiliano Malite, Walter A. Nimir, Jose Jairo De Sales, Roberto Martins Goncalves
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed shapes have been increasingly employed in the construction of small multiple-floored buildings in Brazil, because wide flange shapes required to meet the demand are unavailable on the Brazilian market. Because existing codes fail to cover the design of composite beams constituted of cold-formed shapes, Brazilian design engineers have usually disregarded the contribution of the slab or have adopted improvised calculations that may to lead to unsafe results. The structural behavior of composite beams, constituted of cold-formed double channel shapes and connected to the concrete slab by means of shear connectors that were also cold-formed, was investigated experimentally. Simply supported …
Flexural Wrinkling Behaviour Of Lightly Profiled Sandwich Panels, Mahen Mahendran, D. Mcandrew
Flexural Wrinkling Behaviour Of Lightly Profiled Sandwich Panels, Mahen Mahendran, D. Mcandrew
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In Australia, sandwich panels are commonly made of flat or lightly profiled steel faces and expanded polystyrene foam cores. Flexural wrinkling is often the governing criterion in the design of these panels. The use of lightly profiled faces is expected to increase the flexural wrinkling stress considerably whereas the presence of joints between the polystyrene foam slabs in the transverse direction introduces a reduction to the flexural wrinkling stress. Therefore a series of full scale experiments and finite element analyses were conducted to evaluate the effects of lightly profiled faces and transverse joints on the flexural wrinkling stress of panels …
Stub Column Tests On Cold-Formed Steel Angle Sections, M. Dhanalakshmi, N. E. Shanmugam
Stub Column Tests On Cold-Formed Steel Angle Sections, M. Dhanalakshmi, N. E. Shanmugam
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An investigation on the ultimate load capacity of non-perforated and perforated equal angle cold-formed steel stub columns is presented in this paper. An experimental study has been undertaken to study the behavior of such members subjected to compression. Members were tested to failure under axial or eccentric loading. A comparison of experimental and finite element failure loads, as well as the failure modes of tested specimens, shows that the finite element model is capable of predicting the ultimate load capacity and the failure modes with reasonable accuracy.
Lateral Buckling Of Prismatic Members About An Imposed Axis Of Rotation, Leopold K. Sokol
Lateral Buckling Of Prismatic Members About An Imposed Axis Of Rotation, Leopold K. Sokol
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper deals with the lateral buckling of prismatic members whose position of the axis of rotation is imposed by the conditions of lateral support. As a function of the type of connection with the lateral support, the rotation may be free or hindered (elastic end restraint). This may concern, for instance, the case of a purlin stabilized by a roof structure or of a column stabilized by an external cladding or by another type of efficient continuous bracing. Usually, the check of this type of instability is complex and leads to sophisticated and tedious computations. In order to avoid …
Experimental Investigation Of Cold-Formed Channels Subjected To Combined Bending And Web Crippling, Ben Young, Gregory J. Hancock
Experimental Investigation Of Cold-Formed Channels Subjected To Combined Bending And Web Crippling, Ben Young, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An experimental investigation of cold-formed channels subjected to combined bending and web crippling is described in this paper. A series of tests was performed on unlipped channels rolled from high strength structural steel sheets having nominal plate thickness up to 6 mm, and a maximum web slenderness value of 45. This value is considerably lower than the intended web slenderness values used in the Australian/New Zealand Standard (AS/NZS 4600, 1996) and the American Iron and Steel Institute (AISI, 1996) Specification for cold-formed steel structures. In the past, the typical thickness of cold-formed steel members was less than 3 mm, and …
Web Crippling Of Cold Formed Steel C-And Z- Sections, B. Beshara, R. M. Schuster
Web Crippling Of Cold Formed Steel C-And Z- Sections, B. Beshara, R. M. Schuster
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An experimental investigation of cold formed steel stiffened C-and Z sections subjected to web crippling is presented in this paper. This study was devoted to two loading conditions according to the AISI Specification, namely End Two Flange (ETF) and Interior Two Flange (ITF) loading, with particular emphasis on large inside bend radius to thickness ratios, R, (up to 12) and the specimens being fastened to the support during testing. There is no experimental data available in the literature regarding the web crippling resistance of such members that are fastened to the support and have inside bend radius to thickness ratios …
Strength Of Bearing Stiffeners In Cold Formed C-Sections, R. M. Schuster, S. R. Fox
Strength Of Bearing Stiffeners In Cold Formed C-Sections, R. M. Schuster, S. R. Fox
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The applications of cold formed steel in residential construction have been increasing rapidly in recent years around the world. Some framing practices have been developed that are not covered by the current design specifications, such as using thin cold formed steel stud sections as web stiffeners for C-section floor joists. Earlier tests have shown that the current design methods are unconservative when applied to the types of stiffeners in common usage today. There are a number of variables that influence the capacity of these stiffeners such as stiffener type, position on the joist and connections. All parameters need to be …
Fe Models For Sheeting Under Interaction Load, Jan Kerstens, Bert Snijder, Monique Bakker, H. Hofmeyer
Fe Models For Sheeting Under Interaction Load, Jan Kerstens, Bert Snijder, Monique Bakker, H. Hofmeyer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Experiments show that, after ultimate load, sheeting may fail by three distinct post-failure modes. In this paper, three finite element models are presented, one for each post-failure mode. One of the finite element models was difficult to develop. A spring model explains this. The finite element models show that, at ultimate load, only two different ultimate failure modes exist. This is important for the development of mechanical models for sheeting failure.
An Exafs Study Of Nanocrystalline Yttrium Stabilized Cubic Zirconia Films And Pure Zirconia Powders, Georgina E. Rush, Alan V. Chadwick, Igor Kosacki, Harlan U. Anderson
An Exafs Study Of Nanocrystalline Yttrium Stabilized Cubic Zirconia Films And Pure Zirconia Powders, Georgina E. Rush, Alan V. Chadwick, Igor Kosacki, Harlan U. Anderson
Materials Science and Engineering Faculty Research & Creative Works
Detailed EXAFS (extended X-ray absorption fine structure spectroscopy) measurements have been collected for two nanocrystalline forms of zirconia, namely, dense films of yttria-stabilized cubic zirconia (YSZ) and tetragonal phase powders of pure ZrO2. Zr and Y K edge EXAFS spectra for the YSZ films with grain sizes of 6, 15, and 240 nm showed no major differences with the corresponding spectra of the bulk counterpart. This is clear proof that these nanocrystalline films exhibit similar levels of disorder to that of large crystals. In particular, there is no support for the view that the intergrain regions are highly disordered, and …
Buckling Of Cold Formed Stainless Steel Columns Under Concentric And Eccentric Loading, J. Rhodes, M. Macdonald, W. Mcniff
Buckling Of Cold Formed Stainless Steel Columns Under Concentric And Eccentric Loading, J. Rhodes, M. Macdonald, W. Mcniff
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes the results obtained from a series of compression tests performed on cold formed stainless steel Type 304 columns of lipped channel cross-section. The cross-section dimensions, the column length and the eccentricity of the applied compressive load are varied to examine the effects on the buckling load capacity of the columns. The results obtained are compared to those obtained from the relevant design specifications in America and in Europe, and conclusions are drawn on the basis of the comparisons.
Eccentrically Loaded Bolted Connections For Type 304 And 3cr12 Stainless Steel Lipped Channels, P. Van Tonder, Q. C. Oliphant, G. J. Van Den Berg
Eccentrically Loaded Bolted Connections For Type 304 And 3cr12 Stainless Steel Lipped Channels, P. Van Tonder, Q. C. Oliphant, G. J. Van Den Berg
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In this paper the results of a study on eccentrically loaded bolted connections in lipped channels are presented. The steels chosen for this study are AISI Type 304 and Type 3CR12 stainless steel. It is concluded in this investigation that an acceptable prediction of the strength of eccentrically loaded bolted connections of stainless steel lipped channels may be obtained through the combination between the eccentric loaded equation and the normal bolted connection equations for stainless steel.
Mechanical Properties Of Stainless Steel Lipped Channels, M. Macdonald, J. Rhodes, G. T. Taylor
Mechanical Properties Of Stainless Steel Lipped Channels, M. Macdonald, J. Rhodes, G. T. Taylor
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes and discusses the results obtained from a series of tensile tests performed on cold formed stainless steel Type 304 members of lipped channel cross-section. Standard tensile tests on coupons cut from the webs of the sections were carried out, as were full section tensile tests. Ramberg-Osgood type curves based on the procedure suggested in the ASCE design code were fitted to the stress-strain results and these are compared with the experimental results and Ramberg-Osgood type curves derived on an alternative basis.
The Development Of An Australian Standard For Stainless Steel Structures, Kim J. R. Rasmussen
The Development Of An Australian Standard For Stainless Steel Structures, Kim J. R. Rasmussen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The paper describes the recent development of an Australian standard for the design of cold-formed stainless steel structures. The standard is based on the ANSI/ASCE-8 (1991) Specification for the Design of Cold-formed Stainless Steel Structural Members but augmented to provide rules for cold-formed hollow section members and welded connections. Explicit design rules for the flexural buckling of compression members are also implemented. Further, mechanical properties are included for weldable chromium steels and austenitic-ferritic (duplex) alloys, which are in addition to the alloys included in the ANSII ASCE-8 Specification. The purpose of this paper is to summarise the new rules and …