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Articles 15781 - 15810 of 21740
Full-Text Articles in Engineering
Recent Research And Developments In Cold-Formed Steel Design And Construction, Wei-Wen Yu, Roger A. Laboube
Recent Research And Developments In Cold-Formed Steel Design And Construction, Wei-Wen Yu, Roger A. Laboube
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Unstiffened Elements - Some Interesting Features - Tests of Profiled Steel Decks with V-Stiffeners - Bending Strength of Beams with Non-Linear Analysis - Local and Distortional Buckling of Thin-Walled Beams - Design of C-Sections Against Deformational Lip Buckling - Lateral Buckling of Singly Symmetric Beams - Flexural Capacity of Discretely Braced C's and Z's - The Buckling Behaviour of Hollow Flange Beams - Experimental Investigations of I-Beams - Tests of Continuous Purlins Under Downwards Loading - Tests of Full-Scale Roofing Systems - Profiled Sheet Behaviour Under Concentrated Load - On Design of Profiled Sheets with Varying Cross Sections - Properties …
Prediction Of Corner Mechanical Properties For Stainless Steels Due To Cold Forming, P. Van Der Merwe, G. J. Van Den Berg
Prediction Of Corner Mechanical Properties For Stainless Steels Due To Cold Forming, P. Van Der Merwe, G. J. Van Den Berg
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The results of a study of the degree of workhardening on stainless steel Types 304, 409, 430 and Type 3CR12 corrosion resisting steel due to cold work of forming are presented in this paper. Analytical inelastic stress-strain relationships are established for virgin tensile specimens. An equation for predicting the yield strength of comers are developed.
Stainless Steel Tubular Beams - Tests And Design, Gregory J. Hancock, Kim J. R. Rasmussen
Stainless Steel Tubular Beams - Tests And Design, Gregory J. Hancock, Kim J. R. Rasmussen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The paper presents tests on square and circular stainless steel tubular beams. An important part of the test programme was to quantify the increase in bending strength resulting from cold-work during the fabrication process. Tension and compression tests on coupons cut from finished tubes were also included in the test programme. Stress-strain curves for shear were obtained using the coupon test results and the concept of affinity factors. A design method is proposed for stainless steel tubular beams. The method incorporates the increase in strength produced by the cold-rolling process and is validated by comparing it to the test strengths. …
The Lateral Torsional Buckling Strength Of Cold-Formed Stainless Steel Lipped Channel Beams, P. Van Der Merwe, P. J. Bredenkamp, G. J. Van Den Berg
The Lateral Torsional Buckling Strength Of Cold-Formed Stainless Steel Lipped Channel Beams, P. Van Der Merwe, P. J. Bredenkamp, G. J. Van Den Berg
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The findings of an investigation into the lateral buckling strength of cold-formed singly-symmetric stainless steel beams are reported in this study. The singly-symmetric sections under consideration were lipped channel sections fabricated from a modified AISI stainless steel Type 409 designated 3CR12, a ferritic corrosion resisting steel. The purpose of this study was to compare the experimental strengths of singly-symmetric sections to the theoretical predictions proposed by the new ASCE Specification for the Design of Cold-Formed Stainless Steel Structural Members. It was concluded in this investigation that the tangent modulus approach adopted in the design specification for stainless steels, compared well …
Influence Of Deformed Metal Decking Composite Floors To Beam-Column Connections, Y. Xiao, D. A. Nethercot, B. S. Choo
Influence Of Deformed Metal Decking Composite Floors To Beam-Column Connections, Y. Xiao, D. A. Nethercot, B. S. Choo
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A series of tests designed to investigate the interaction of a variety of different steel beam to column connection details with a composite metal deck floor is described. The main emphasis is on assessing the connections' moment capacity, rotational stiffness and rotation capacity. The full details of the experimental behaviour of the flush end plate and partial depth end plate connections will be described in this paper. A simple method for moment capacity calculation based on the test results is proposed herein.
Testing And Design Of Bolted Connections In Cold Formed Steel Sections, F. Zadanfarrokh, E. R. Bryan
Testing And Design Of Bolted Connections In Cold Formed Steel Sections, F. Zadanfarrokh, E. R. Bryan
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A detailed analysis of the strength and rigidity of bolted connections in cold formed steel has been carried out. Design expressions are proposed that improve on the existing equations for bearing strength, and for the first time, quantify the rigidity of such connections. The effects on the design of bolted joints are described and it is shown how, by incorporating the proposed expressions, it is now possible to select the correct semirigid joint and achieve economy without having to resort to testing.
The Bi-Axial Behaviour Of Shear Connectors In Composite Slabs And Beams, Chris T. Duffy, David O'Leary, Michel Montourcy
The Bi-Axial Behaviour Of Shear Connectors In Composite Slabs And Beams, Chris T. Duffy, David O'Leary, Michel Montourcy
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The use of composite beams which utilise steel beams together with a composite steel sheet/concrete floor slab is well developed. Many forms of steel profile are used and the form of attachment to the steel beam is generally by welded shear studs or shot-fired shear connectors. The design procedures for these beams require a knowledge of the shear capacity of the connectors which may be influenced by the type of profile being used for the beam. This shear capacity is often deduced from information obtained from standard push-off tests which mayor may not include in the test set-up the actual …
Design Of C-Sections Against Deformational Lip Buckling, D. Buhagiar, J. C. Chapman, P. J. Dowling
Design Of C-Sections Against Deformational Lip Buckling, D. Buhagiar, J. C. Chapman, P. J. Dowling
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Deformational lip buckling is one of the considerations affecting the choice of cross-section dimensions which were adopted for the C-sectlon chord members of a space frame system. No guidance on lip buckling of channel sections is given in the current British design specification. A method was therefore required for determining the lip buckling resistance of the members when subjected to axial compression or bending. A design procedure was formulated in which the lips are represented as a strut on an elastic foundation, the stiffness of which depends on the deformational stiffness of the section. The critical buckling stress and the …
Local And Distortional Buckling Of Thin-Walled Beams, Reynaud Serrette, Teoman Pekoz
Local And Distortional Buckling Of Thin-Walled Beams, Reynaud Serrette, Teoman Pekoz
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Recent research has characterized the behavior of panel beams with laterally unsupported compression flanges as either a complex local buckling mode or an overall buckling mode. Tests have shown that the behavior of the unsupported flange and web is similar to that of lateral buckling, except, rotation is enforced along the axis of the web and the tension flange--a behavior which may be described as distortional buckling. In the work described here, an analytical expression is presented for computing the elastic distortional buckling stress based on a model which treats the web and compression flange as an elastically restrained beam. …
Tests On Full-Scale Roofing Systems, D. B. Moore
Tests On Full-Scale Roofing Systems, D. B. Moore
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This report details an experimental investigation on three full-scale, cold-formed steel roofing systems. The test programme included both uniformly and variably distributed loadings representative of drifting snow. Comparisons between the performance of each roof subject to these distributions are made and recommendations for the design of roofs loaded with variably distributed loads are presented. Finally observations on the tests to failure are discussed.
Contrasting Behaviour Of Thin Steel Roof Claddings Uder Simulated Cyclonic Wind Loading, Mahen Mahendran
Contrasting Behaviour Of Thin Steel Roof Claddings Uder Simulated Cyclonic Wind Loading, Mahen Mahendran
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
During an investigation on thin steel roof claddings under simulated cyclonic wind loading, it was found that trapezoidal roofing behaved quite differently to corrugated roofing due to the presence of overload cycles. This paper examines this contrasting behaviour of these two roofing profiles.
On Design Of Profiled Sheets With Varying Cross Sections, Laszlo Horvath, Miklos Nemeti, Bela Veroci
On Design Of Profiled Sheets With Varying Cross Sections, Laszlo Horvath, Miklos Nemeti, Bela Veroci
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A short review is given on the effective width concept and about its use for determining of the moment capacity of sheets. A modified method, taking into account the varying flexural rigidity along the spans, is described and illustrated on examples carried out on first -generation panels.
Properties For Cellular Decks In Negative Bending, K. Balaji, Larry D. Luttrell
Properties For Cellular Decks In Negative Bending, K. Balaji, Larry D. Luttrell
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cellular roof and floor decks may be formed by attaching essentially flat sheets to a "hat-shapes" or to fluted profiles by spot welding along the contact lines. This leads to a closed cellular deck unit suitable for such purposes as in-floor power distribution or communication systems. In positive bending, or when the flat sheet is in tension and stable, cellular deck flexural properties can be determined following the American Iron and Steel Institute Cold Formed Steel Design Manual. When the flat sheet is in compression, its contribution is not described in the AISI Manual since it is not continuously connected …
Composite Slabs Analyzed By Block Bending Test, Li An, Krister Cederwall
Composite Slabs Analyzed By Block Bending Test, Li An, Krister Cederwall
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A new small-scale test, concrete block bending test, was carried out to determine the amount of shear stress and the slip distribution at the interface between the steel sheet and the concrete. The result was then used in the finite element analysis to predict the behaviour of composite slabs. Good agreement has been shown between the analytical results and measured results from the full-scale composite slabs.
Repeated Point Loading Tests On Composite Slabs, Yoshimitsu Itoh, Kiyoshi Komori, Hiroshi Fujioka
Repeated Point Loading Tests On Composite Slabs, Yoshimitsu Itoh, Kiyoshi Komori, Hiroshi Fujioka
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Single span and double span composite slab specimens were tested by subjecting them to concentrated repeated point loading. From the test results, it was found that the control of concrete cracks caused by the negative moment over the interior support is important in the latter case.
Thermal Shielding Near Intermediate Supports Of Continuous Span Composite Slabs, Kees Both, Leen Twilt, Jan W. B. Stark
Thermal Shielding Near Intermediate Supports Of Continuous Span Composite Slabs, Kees Both, Leen Twilt, Jan W. B. Stark
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
At TNO Building and Construction Research, in close co-operation with the Eindhoven University of Technology, research is carried out on the behaviour of fire-exposed composite steel/concrete slabs, in the framework of a research project co-sponsored by the ECSC (European Community for Steel and Coal). The paper describes the state of the art of the research project.
Design Of Channels Against Distortional Buckling, Y. B. Kwon, Gregory J. Hancock
Design Of Channels Against Distortional Buckling, Y. B. Kwon, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Thin-walled lip-stiffened channel columns composed of high strength steel may fail in a distortional mode involving movement of the lip stiffener perpendicular to the flange plate it supports. In this report, test results for a simple lipped channel section(CH1) and an intermediate stiffened channel section (CH2) of thickness of approximately 1.1 mm (0.043 in) and 550 MPa (79.8 ksi) steel and undergoing distortional or mixed local-distortional buckling failure are compared with different design methods. The design methods compared are Australian Standard AS1538, EC3 Partl/ Annexe A, the ECCS Recommendations and the AISI Specification. In addition, new methods based on a …
Distortional Buckling Of Cold-Formed Steel Z-Section Columns, P. Charnvarnichborikarn, Dimos Polyzois
Distortional Buckling Of Cold-Formed Steel Z-Section Columns, P. Charnvarnichborikarn, Dimos Polyzois
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Current North American guidelines for the design of cold-formed steel members consider the web of cold-formed steel sections under direct compression to be a fully stiffened element. This, however, may not be true if the flanges cannot provide sufficient restraint to the web. In this case, instability of the web element may cause distortional failure of the flange-edge stiffener component which may limit the load-carrying capacity of these sections with very little post-buckling strength being realized. In the present paper, the effect of web buckling on the load-carrying capacity of Z-sections with partially stiffened flanges is examined. The current design …
Flexibly Connected Thin-Walled Space Frame Stability, Sundar Chandramouli, Shien T. Wang, George E. Blandford
Flexibly Connected Thin-Walled Space Frame Stability, Sundar Chandramouli, Shien T. Wang, George E. Blandford
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The elastic stability of a cubic space frame composed of cold-formed steel members is studied for various bending and warping rigidities. A finite element technique is used to perform a parametric study of the elastic stability response of the flexibly connected frame. The results are compared with previously published observations for hot-rolled steel sections. The criterion used for deciding the significance of warping for hot-rolled sections is not found to be applicable to cold-formed sections.
Shah Alam Sports Complex Design And Construction Of Unistrut Space-Frame Roof Structure, Khaldoun Mhaimeed, Sun Chien Hsiao
Shah Alam Sports Complex Design And Construction Of Unistrut Space-Frame Roof Structure, Khaldoun Mhaimeed, Sun Chien Hsiao
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The Shah Alam Sports Complex is a $100-million multiuse sports facility in Selangor, Malysia. The main feature of this complex is a 72000-seat multisport stadium. Seating on both sides of the stadium will be covered by a pair of barrel-vaulted acrylic sky roofs. Each roof is structurally supported by a Unistrut Space-Frame which in tum is supported at three of its four edges with a free span of 931 feet (284 m). The frame is cantilevered from the back 226 feet (69 m) over the seats. In this paper, design philosophy to satisfy serviceability and ultimate limit states is discussed. …
Some Applications Of Generalized Beam Theory, J. Michael Davies, Philip Leach
Some Applications Of Generalized Beam Theory, J. Michael Davies, Philip Leach
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Generalised Beam Theory (GBT) has been developed by Professor R Schardt and his colleagues at the University of Darmstadt in Germany. The definitive reference at the present time is a recent German text(1) which describes the first-order theory. For the analysis of cold-formed sections, second-order theory may be required and this is less well documented. This paper will attempt to describe the principles involved and illustrate them by means of some practical examples. GBT unifies the conventional theories for the analysis of prismatic thin-walled structural members within a consistent notation. It then extends them into new territory. Conventional beam theory …
Recent Developments In Cold Formed Steel, Robert W. Dannemann
Recent Developments In Cold Formed Steel, Robert W. Dannemann
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
During the last fifteen years the author has been working in the development of new products in cold formed steel, mainly in building applications. Cold formed steel makes possible practically an infinite variety of shapes, one for each need and function. This possibility is a continuous challenge for designers in finding, among many alternatives, the optimal solution for each problem. The author describes briefly a set of six proposals, which are either an already tested and proven product, or just its phase of design. As in any human doing, the author is conscious that these proposals may be accomplished and …
The 1989 Edition Of The Canadian Cold Formed Steel Design Standard, R. M. Schuster
The 1989 Edition Of The Canadian Cold Formed Steel Design Standard, R. M. Schuster
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents excerpts from the latest edition of the Canadian Standard for the design of cold formed steel structural members (CAN/CSA-SI36-M89). Considerable technical changes, reflecting the latest research developments, have been incorporated into this edition of the Standard. These changes are based on an increased understanding of the behaviour of cold formed steel structures, members, and elements and of cold formed steel as a structural material. Some of the more significant technical changes of the Standard are discussed in greater detail. Comparisons with the Standard's predecessor (CAN3-S136-M84), and whenever appropriate, with the 1986 AISI Specifications are also made.
Axial Load Capacity Of Sheeted Cold-Formed C And Z Members, Neil J. Glaser, Richard C. Kaehler, James M. Fisher
Axial Load Capacity Of Sheeted Cold-Formed C And Z Members, Neil J. Glaser, Richard C. Kaehler, James M. Fisher
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Conservative Confidence Intervals Of Importance Sampling Estimates, Kurt Louis Kosbar, T. F. Chang
Conservative Confidence Intervals Of Importance Sampling Estimates, Kurt Louis Kosbar, T. F. Chang
Electrical and Computer Engineering Faculty Research & Creative Works
Confidence intervals (CI) are used to gauge the accuracy of bit error rate (BER) estimates produced by Monte Carlo (MC) simulations. This work attempts to objectively evaluate the performance of Important Sampling (IS) simulations by applying the same statistical analysis tool. While it is not possible to evaluate the minimum size CI for arbitrary IS estimates, it is possible to over-bound the interval using a technique called conservative confidence interval (CCI) estimation. This bounding procedure is applied to a simple IS biasing technique. While the IS estimate may be superior to the MC estimate, the CCI fails to support this …
Interval Estimation And Monte Carlo Simulation Of Digital Communication Systems, Kurt Louis Kosbar, T. F. Chang
Interval Estimation And Monte Carlo Simulation Of Digital Communication Systems, Kurt Louis Kosbar, T. F. Chang
Electrical and Computer Engineering Faculty Research & Creative Works
This work quantifies the accuracy of bit error rate (BER) estimates produced by Monte Carlo simulations by carefully applying confidence interval estimation techniques. Due to numerical difficulties, some previous work in this area has assumed that the BER statistic possessed a Gaussian distribution. This work demonstrates that in some important regions the estimate is decidedly non-Gaussian, and application of central limit theorem arguments can result in errors in excess of an order of magnitude. This work investigates the accuracy of common approximations and the feasibility of exact calculation of confidence intervals, and presents a novel polynomial class approximation. By combining …
Object-Oriented Modeling Of Communication Systems, Kurt Louis Kosbar, Kevin W. Schneider
Object-Oriented Modeling Of Communication Systems, Kurt Louis Kosbar, Kevin W. Schneider
Electrical and Computer Engineering Faculty Research & Creative Works
Conventional communication system simulation programs and packages are written using procedural programming languages. Newly developed, object-oriented languages offer the simulation designer significantly different options and structures. By exploiting these new techniques it is possible to significantly increase the flexibility and extensibility of the simulation package. This allows the system analyst to efficiently re-use complex simulation code and quickly and reliably reconfigure the simulation. In addition, a single object-oriented simulation can be used in all stages of the design process, from conceptual design through fabrication and testing. A final benefit of the object-oriented techniques is that the simulation code closely matches …
The Effect Of Additives On The Nucleation And Growth Of Copper Onto Stainless Steel Cathodes, M. Sun, Thomas J. O'Keefe
The Effect Of Additives On The Nucleation And Growth Of Copper Onto Stainless Steel Cathodes, M. Sun, Thomas J. O'Keefe
Materials Science and Engineering Faculty Research & Creative Works
A potentiostatic technique has been used to study the effects of chloride ion, glue, and thiourea on the initial electrodeposition of copper. A stainless steel (AISI 304) rotating disc electrode (RDE) with an electrolyte containing 40 g/1 Cu2+ and 180 g/1 H2SO4 at 40 °C was employed. The current transients from the potential step measurements for the additive-free electrolyte could be fitted to a model that assumed progressive nucleation followed by growth of three-dimensional (3-D) centers under diffusion control. The growth mechanism and the type of nuclei were also confirmed by scanning electron microscopy (SEM) of …
The Management Of Replicated Data, Hsueh-Chi Shih, C. Y. Ho, S. Alptekin
The Management Of Replicated Data, Hsueh-Chi Shih, C. Y. Ho, S. Alptekin
Computer Science Technical Reports
Data replication, which has the benefits of improving system availability and read performance, proved to be indispensable to many database applications. In a replicated database, the one-copy serializability of transaction executions can be ensured by employing a replica control mechanism on top of the traditional concurrency control mechanism. This work contains two replica control algorithms and a read-only transaction processing algorithm. Both replica control algorithms handle multiple site, communication and partitioning failures. The replica control algorithms achieve read operation efficiency by always translating a logical read operation into one local physical read operation and by taking advantage of the locality …
Diffraction In The Binary Encounter Electron Peak Observed In Collisions Of 0.6 Mev Amu⁻¹ I7+, I23+ And Au11+ Projectiles With He And Ar, W. Wolff, J. L. Shinpaugh, H. E. Wolff, Ronald E. Olson, Jee-Ching Wang, S. Lencinas, D. Piscevic, R. Herrmann, H. Schmidt-Böcking
Diffraction In The Binary Encounter Electron Peak Observed In Collisions Of 0.6 Mev Amu⁻¹ I7+, I23+ And Au11+ Projectiles With He And Ar, W. Wolff, J. L. Shinpaugh, H. E. Wolff, Ronald E. Olson, Jee-Ching Wang, S. Lencinas, D. Piscevic, R. Herrmann, H. Schmidt-Böcking
Physics Faculty Research & Creative Works
Relative double differential cross sections for electron emission from collisions of 0.6 MeV amu-1I7+and I23+ projectiles with Ar and Au11+projectiles with He were measured for electron energies from 100 eV to 2000 eV and for angles from 0° to 50°. Experimentally observed sudden shifts of the position of the binary encounter peak were interpreted as resulting from quantum interference in the scattering of target electrons from the partially stripped projectile ion. To this end calculations for the elastic scattering of free electrons initially at rest in the laboratory reference frame from the screened …