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Articles 13051 - 13080 of 21751
Full-Text Articles in Engineering
Sway Stability Testing Of High Rise Rack Sub-Assemblages, Elisha Harris, Gregory J. Hancock
Sway Stability Testing Of High Rise Rack Sub-Assemblages, Elisha Harris, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The stability in the down-aisle direction of high rise storage racks is usually provided by the beam-to-column and base-plate connections. In order to evaluate the effect of the beam-to-column connections, a complex test rig has been designed and developed at the University of Sydney to test rack sub-assemblages which are the lower levels of high rise rack systems. The rig is designed to apply up to 500 kN vertical load via gravity load simulators. Pins at the top and bottom of the uprights under test remove the effect of the base-plates on the lateral stability. To apply horizontal loads, a …
Design Of Channels Subjected To Concentrated Bearing Load, Ben Young, Gregory J. Hancock
Design Of Channels Subjected To Concentrated Bearing Load, Ben Young, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A test program on cold-formed steel channels subjected to concentrated bearing load is presented in this paper. The web slenderness values of the channel specimens ranged from comparatively stocky webs of 15.3 to relatively more slender webs of 62.7. The tests were performed under end and interior loading conditions, and the test setup was different from the one specified in the North American Specification and the Australian/New Zealand Standard for cold-formed steel structures where the loading support is assumed free to rotate in the plane of the beam. The test specimens were seated on a fixed flat solid steel base …
Web Crippling Strength Of Multi-Web Steel Deck Sections Subjected To End One Flange Loading, Onur Avci, Samuel W. Easterling
Web Crippling Strength Of Multi-Web Steel Deck Sections Subjected To End One Flange Loading, Onur Avci, Samuel W. Easterling
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel deck profiles are extensively used in building construction due to their versatility and economical considerations. Web crippling is one of the failure modes for these multi-web profiles. The 1996-AISI Specification for the Design of Cold-Formed Steel Structural Members provisions for web crippling are believed to be conservative for multi-web deck sections. They are based on unfastened specimens and are limited to the use of decks with certain geometric parameters. The unified web crippling equation of the North American Specification for the Design of Cold-Formed Steel Structural Members (AISI 2001) is also limited to certain geometric parameters. Although it …
Direct Strength Method For The Design Of Purlins, Luis Quispe, Gregory J. Hancock
Direct Strength Method For The Design Of Purlins, Luis Quispe, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The Direct Strength Method (DSM) has recently been developed by Schafer and Pekoz for the design of cold-formed steel structural members. What is now required is the calibration of the method against existing design methodologies for common structural systems such as roof and wall systems. The paper firstly explains the application of the DSM for the design of simply supported and continuous purlins. Some generalizations, such as how to handle combined bending and shear at the ends of laps, have had to be made to implement the method for continuous purlin systems. The method is then applied to study a …
Post-Buckling Analysis Of Light Gauge Members Using Finite Strips, J. Rhodes
Post-Buckling Analysis Of Light Gauge Members Using Finite Strips, J. Rhodes
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The development of an analysis technique for the behaviour of light gauge structural members is outlined. The analysis described is a form of finite strip approach in which the out-of-plane displacements are considered using plate theory and the in-plane displacements are considered using beam theory. Several different strip formulations are described, and the relative applicability of each formulation to buckling and post-buckling analysis is discussed. With regard to post-buckling analysis the relatively simple "lower bound approach" is discussed and compared to more complex analysis methods.
Design Provisions For Sections Containing Unstiffened Elements Under Stress Gradients, M. R. Bambach, Kim J. R. Rasmussen
Design Provisions For Sections Containing Unstiffened Elements Under Stress Gradients, M. R. Bambach, Kim J. R. Rasmussen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Current American design provisions treat unstiffened elements under stress gradients as if they were uniformly compressed for effective width calculations. This paper presents a design method for calculating the effective width of these elements, based on plate test results. Current international codes allow the capacity of sections that contain unstiffened elements under stress gradients to be calculated on the basis of initiation of yielding in the section. A non-iterative method for the calculation of the capacity, based on inelastic reserve capacity, is presented. The method is shown to be in good agreement with experimental data of I-sections and plain channels …
Finite Element Modelling Of Stainless Steel Columns With Variation In Mechanical Properties, M. Macdonald, J. Rhodes
Finite Element Modelling Of Stainless Steel Columns With Variation In Mechanical Properties, M. Macdonald, J. Rhodes
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes the results obtained from a finite element investigation into the column capacity of Type 304 stainless steel column members of lipped channel cross-section. Stress-strain curves derived from tests were incorporated into non-linear finite element analyses of eccentrically loaded stainless steel columns. The results obtained are compared with test results on stainless steel channel columns with the same properties and dimensions, and also with design code predictions.
The Behaviour Of Drive-In Storage Structures, M. H. R. Godley
The Behaviour Of Drive-In Storage Structures, M. H. R. Godley
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The paper describes the behaviour of Drive-in and Drive-thru pallet rack structures. It proposes a number of simplified two-dimensional models for the analysis of such structures. These models are shown to be conservative and take account of the non-linear behaviour of the structures. The paper makes some comparisons between the output from these and a 3-D finite element program. The effects of friction between the pallet and the supporting rail is discussed briefly.
Optimum Design Of Cold-Formed Steel Z-Shape Purlins Using A Genetic Algorithm, Wei Lu, Pentti Makelainen, Jyrki Kesti
Optimum Design Of Cold-Formed Steel Z-Shape Purlins Using A Genetic Algorithm, Wei Lu, Pentti Makelainen, Jyrki Kesti
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In this paper, a genetic algorithm is applied to optimize the dimensions of cold-formed Z-shape purlins continuous over two spans under gravity load. The optimization criterion is to maximize the load resistance per cross-section and the design variables are chosen from the discrete values based on the manufacturing requirements. Purlins are designed in accordance with Eurocode 3, Part 1.3. In addition, the modified Eurocode 3 method, in which the elastic local buckling stress and distortional buckling stress calculated using Finite Strip Method (FSM) are integrated into the design process, is used to determine the effective section properties. The results are …
Self-Drilling Screw Joints For Cold-Formed Channel Portal Frames, Julie Mills, Roger A. Laboube
Self-Drilling Screw Joints For Cold-Formed Channel Portal Frames, Julie Mills, Roger A. Laboube
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed C channel sections have been used in portal frame construction for agricultural sheds for many years in Australia. The knee joint designs have been copied from hot-rolled portal frames, regardless of the fact that many designers believe this is not realistic. Earlier testing conducted at the University of South Australia demonstrated that these concerns were justified and that the joint designs widely used in practice do not match the moment capacity of the sections and fail prematurely. An alternative joint design has been developed using self- drilling screws. The joint demonstrates excellent moment capacity and rigidity, and is simple …
Strength And Behavior Of Flare-Bevel And Flare-Vee Welded Connections In G450 Sheet Steel, Lip H. Teh, Gregory J. Hancock
Strength And Behavior Of Flare-Bevel And Flare-Vee Welded Connections In G450 Sheet Steel, Lip H. Teh, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
G450 steel to AS 1397 is a cold-reduced sheet steel with in-line galvanizing. Its grade is 65 ksi (450 MPa) yield and 70 ksi (480 MPa) tensile strength. It is widely used in Australia for purlins, and is being used to fabricate light-weight portal frames, often by welding. The effect of welding on G450 sheet steel in the heat affected zone (HAZ) was unknown and so the project was performed to investigate the strength of flare-bevel and flare-vee welded connections. Flare-bevel and flare-vee welded connections in 0.06-in (1.5-mm) and 0.12-in (3.0-mm) sheet steels were tested to failure. The failure modes …
Compression Tests Of Cold-Reduced High Strength Steel Stub Columns, Demao Yang, Gregory J. Hancock
Compression Tests Of Cold-Reduced High Strength Steel Stub Columns, Demao Yang, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes a series of compression tests performed on stub columns fabricated from cold-formed high strength steel plates with nominal yield stress of 550 MPa. (80 ksi) The steel is classified as G550 to Australia Standard AS 1397. The test results presented in this paper are the first stage of an Australian Research Council research project entitled "Compression Stability of High Strength Steel Sections with Low Strain-Hardening". The tests include lipped-square and hexagonal sections, including 94 box-shaped fix-ended stub columns. The purpose of these tests was to determine the influence of low strain hardening of G550 steel on the …
Plastic Strength Of Thin-Walled Members, Dan Dubina, Viorel Ungureanu
Plastic Strength Of Thin-Walled Members, Dan Dubina, Viorel Ungureanu
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Failure of thin-walled cold-formed members in compression is always characterized by a local plastic mechanisms, either a stub or slender column is referred. Starting from this observation, the authors suggest for the interactive local-overall buckling analysis to use instead of traditional "effective section", the sectional plastic mechanism strength. This is a new approach and for this reason it is compared with another one, namely the Direct Strength Method. Experimental results and advanced FEM simulations are used to evaluate the two methods. Comparisons with European and American relevant design codes are also presented in the paper.
Application Of A Finite Element Model To A Cold-Formed Steel C-Section With A Bearing Stiffener, G. W. Brodland, S. R. Fox
Application Of A Finite Element Model To A Cold-Formed Steel C-Section With A Bearing Stiffener, G. W. Brodland, S. R. Fox
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Described in this paper is the application of a finite element model to a cold-formed steel C-section with a bearing stiffener installed between its flanges. This model has been used to determine both the web crippling capacity of the joist, and the forces that develop in the fasteners connecting the bearing stiffener to the joist. The finite element model was also used to carry out parametric studies of the stiffened joist assembly to determine the impact on the web crippling capacity and the fastener forces caused by variations in the assembly. Based on the results of these finite element studies, …
Study Of Innovative Built-Up Cold-Formed Beams, Gianmaria Di Lorenzo, Raffaele Landolfo
Study Of Innovative Built-Up Cold-Formed Beams, Gianmaria Di Lorenzo, Raffaele Landolfo
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In the present work innovative built-up cold-formed steel beams are presented. These are obtained by combining the pressing and cold-rolling forming techniques of steel sheets, along with the use of suitable connecting systems. Firstly, the beam shape features and the possible application fields, as well as the research project devoted to the assessment of their structural behaviour, are discussed. Then, experimental results concerning the characterization of both sheet material properties and connecting system performances are shown. In particular, the study of the sheet material is carried out by using an appropriate methodology of analysis, aiming at evaluating both mechanical and …
Effective Widths Of Unstiffened Elements Under Combined Compression And Bending, M. R. Bambach, Kim J. R. Rasmussen
Effective Widths Of Unstiffened Elements Under Combined Compression And Bending, M. R. Bambach, Kim J. R. Rasmussen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Details of a dual-actuator rig developed for testing rectangular plates simply supported on three sides, with the remaining (longitudinal) edge free, under combined uni-axial compression and in-plane bending are presented. Particular attention is given to ensuring a constant strain eccentricity to the loaded ends, as opposed to a constant load eccentricity, in order to determine the post-buckling behavior and ultimate load and moment capacities of unstiffened thin-walled elements. Strain gradients varying from pure compression to pure bending are facilitated. The plate test results are presented in the form of strength curves, and are used to establish effective width equations for …
Interim Design Rules For Flexure In Cold-Formed Steel Webs, Benjamin W. Schafer, T. W. J. Trestain
Interim Design Rules For Flexure In Cold-Formed Steel Webs, Benjamin W. Schafer, T. W. J. Trestain
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The design of cold-formed steel webs in flexure is governed by section B2.3 of the AISI Specification. Harmonization of the AISI (1996) Specification with the Canadian Standard (S136 1994), for the development of the new North American Specification (NAS 2001) has brought to light shortcomings in both the U.S. and Canadian documents and lead to the adoption of an interim design approach in the NAS (2001). The interim approach employs the AISI (1996) rules for one class of members and the S136 (1994) rules for a second class. Assessment of the resulting method with existing bending tests on Cees and …
Web Crippling Of Cold-Formed Steel Members, B. Beshara, R. M. Schuster
Web Crippling Of Cold-Formed Steel Members, B. Beshara, R. M. Schuster
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The North American Specification for the Design of Cold-Formed Steel Structural Members (NAS 2001) has recently adopted a new web crippling approach, which is the approach contained in the Canadian S136 Standard (CSA 1994). The objective of this work was to develop new design coefficients for the web crippling strength design expression currently used in the Canadian S136 Standard (CSA 1994) and the North American Specification (NAS 2001). An extensive statistical analysis was performed using published test data up to 1999, from the United States, Canada and Australia. The resulting web crippling coefficients, calibrated resistance factors and respective factors of …
Adaptive Nonlinear Finite Element Analyses Of High Strength Steel Cladding Systems, M. Duan, Mahen Mahendran
Adaptive Nonlinear Finite Element Analyses Of High Strength Steel Cladding Systems, M. Duan, Mahen Mahendran
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In this paper, an adaptive nonlinear finite element method was developed and applied to the ultimate strength analysis of light gauge high strength steel cladding. Effect of mesh refinement on the solution accuracy was investigated for the nonlinear analysis of steel cladding systems under wind uplift loading. A comparison of numerical solutions was made with experimental results and a good agreement is shown using the adaptive finite element method. A parametric study was also conducted to investigate the factors that affect the ultimate strength behavior of high strength steel cladding systems. This paper presents the details of this study and …
Photoreflectance Spectroscopy Of Strained (In)Gaasn/Gaas Multiple Quantum Wells, J. B. Heroux, Xiaodong Yang, W. I. Wang
Photoreflectance Spectroscopy Of Strained (In)Gaasn/Gaas Multiple Quantum Wells, J. B. Heroux, Xiaodong Yang, W. I. Wang
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The effect of a variation of the indium and nitrogen concentrations in Inᵪ Ga1-x As1-y Ny /GaAs multiquantum wells grown by molecular beam epitaxy is studied systematically by room temperature photoreflectance spectroscopy. The band gap redshift caused by a nitrogen fraction of 1.5% decreases by as much as 30% as the indium fraction increases from 0% to 20%. A moderate increase of electron effective mass (Δmₑ ~ 0.03m₀) is found in all samples containing nitrogen (y ≳ 1%). In compressively strained quantum wells, the energy separation between the first confined heavy and light hole energy levels decreases …
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Members, Roger A. Laboube, R. Schuster
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Members, Roger A. Laboube, R. Schuster
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Members, R. M. Schuster, Roger A. Laboube
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Members, R. M. Schuster, Roger A. Laboube
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Application Of Maxwell Solvers To Pd Propagation. I. Concepts And Codes, David Pommerenke, S. Sakaguchi
Application Of Maxwell Solvers To Pd Propagation. I. Concepts And Codes, David Pommerenke, S. Sakaguchi
Electrical and Computer Engineering Faculty Research & Creative Works
This article reviews the basic approaches to solving electromagnetic propagation in the context of PD detection. It also investigates available commercial software, introduces the steps required to obtain trustworthy computational results, and gives an example of detailed analysis of PD propagation.
Phonon Dispersion Measurements Of Yba2cu3o6.15 And Yba2cu3o6.95 By Time-Of-Flight Neutron Spectroscopy, J-H Chung, T. Egami, R. J. Mcqueeney, M. Yethiraj, M. Arai, T. Yokoo, Herbert A. Mook, Y. Endoh, S. Tajima, C. Frost, Fatih Dogan
Phonon Dispersion Measurements Of Yba2cu3o6.15 And Yba2cu3o6.95 By Time-Of-Flight Neutron Spectroscopy, J-H Chung, T. Egami, R. J. Mcqueeney, M. Yethiraj, M. Arai, T. Yokoo, Herbert A. Mook, Y. Endoh, S. Tajima, C. Frost, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
We measured the phonon dispersions of YBa2Cu3O6.15 and YBa2Cu3O6.95 by time-of-flight inelastic neutron scattering. The in-plane bond-stretching modes in the metallic phase showed a distinct a-b plane an isotropy beyond what is expected for structural origin. Such an isotropy in the longitudinal optical modes, which is absent in the TO, suggests strong in-plane anisotropy in the underlying electronic structure. Apical oxygen bond-stretching modes showed a large frequency change between the insulating and the metallic phases. This large softening also is beyond structural origin, and suggests the effect of local electronic …
Metrics-Based Framework For Decision Making In Cots-Based Software Systems, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul
Metrics-Based Framework For Decision Making In Cots-Based Software Systems, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul
Electrical and Computer Engineering Faculty Research & Creative Works
The growing reliance on Commercial-Off-The-Shelf (COTS) components for developing large-scale projects introduces a new paradigm in software Engineering; which requires the design of new software development and business processes. Large scale component reuse leads to savings in development resources, enabling these resources to be applied to areas such as quality improvement. These savings come at the price of integration difficulties, performance constraints, and incompatibility of components from multiple vendors. Relying on COTS components also increases the system's vulnerability to risks arising from third-party development, which can negatively affect the quality of the system, as well as causing expenses not incurred …
Method For Sintering Ceramic Tapes, Fatih Dogan, Jian-Huei Feng, Lucian G. Ferguson
Method For Sintering Ceramic Tapes, Fatih Dogan, Jian-Huei Feng, Lucian G. Ferguson
Materials Science and Engineering Faculty Research & Creative Works
Flexible Setter powder deposition sheets containing Setter powders were developed for Sintering of ceramic articles including tapes by an economical, fast and Simple method. The sheets provide for deposition of a thin and uniform layer of Setter powders on a green ceramic article after burnout of a binder in the sheet. Because of high Strength and low burnout temperature, hydroxypropyl methylcellulose binder is preferred for production of these sheets. Tape cast sheets with low Solids loading can be obtained by optimizing the wetting behavior of aqueous slurries on tape carrier. Setter, powder deposition sheets are of particular benefit in processing …
On The Use Of Singular Perturbations To Neglect The Dynamic Saliency Of Synchronous Machines, Steven D. Pekarek, Michael T. Lemanski, Eric A. Walters
On The Use Of Singular Perturbations To Neglect The Dynamic Saliency Of Synchronous Machines, Steven D. Pekarek, Michael T. Lemanski, Eric A. Walters
Electrical and Computer Engineering Faculty Research & Creative Works
A common approximation used in the analysis of power systems is the neglect of the dynamic saliency in synchronous machines. In this paper, it is shown that eliminating the error associated with neglecting dynamic saliency can be accomplished with the addition of a singular perturbation(s) into the machine model. By considering the elimination of error in such a way, singular-perturbation-based model-order-reduction techniques are used to derive detailed- and reduced-order models of synchronous machines where dynamic saliency is eliminated with zero error and no added numerical cost.
Composite Structures Using Asphalt Based Roofing Scrap Materials: Eiera -- Final Report, V. J. Flanigan, K. Chandrashekhara, Susan L. Murray
Composite Structures Using Asphalt Based Roofing Scrap Materials: Eiera -- Final Report, V. J. Flanigan, K. Chandrashekhara, Susan L. Murray
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The uses of recycled materials in composites provide the potential for large cost savings and a solution to the ever-growing disposal problem. Shingles contain petroleum based binders and fillers, which used as a valuable resource in composite production. Composites offer inherent advantages over traditional materials in regard to corrosion resistance, design flexibility and extended service life. Use of scrap-roofing shingles as a core material in glass fiber reinforced composite materials offer potential low cost composite products such as sound barrier system, railroad ties and other building materials including blocks. In the present work, processes have been developed for shredding scrap …
Introducing Molecular Biology To Environmental Engineers: Through Development Of A New Course, Daniel B. Oerther
Introducing Molecular Biology To Environmental Engineers: Through Development Of A New Course, Daniel B. Oerther
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The introduction of a course "Molecular Methods in Environmental Engineering" is discussed. The course is developed to address the growing national need for integrating geonomics and molecular biology into the engineering curriculum. Fifteen graduate students were successfully introduced to molecular biology through lectures and hands-on laboratory excercises following the "full-cycle 165 rRNA approach". The course helps in providing supportive and independent learning environment to the students.
Dopant Effect On Local Dielectric Properties In Barium Titanate Based Electroceramics Determined By Transmission Eels, Kalpana S. Katti, Maoxu Quian, Fatih Dogan, Mehmet Sarikaya
Dopant Effect On Local Dielectric Properties In Barium Titanate Based Electroceramics Determined By Transmission Eels, Kalpana S. Katti, Maoxu Quian, Fatih Dogan, Mehmet Sarikaya
Materials Science and Engineering Faculty Research & Creative Works
Investigates the local electronic excitations of barium titanate electro ceramic using low-loss electron energy loss spectroscopy. Process for monitoring of electronic structure of titanate; Changes in valence and conduction band states by valence state of barium; Shift of oscillator strengths of excitations in local regions.