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CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
- Keyword
-
- Built-up section||modified slenderness ratio||axial strength (1)
- Cold-formed steel||LSF floors||gypsum plaster board||fire test||insulation||fire rating||finite element analysis (1)
- Finite strip method||constrained finite strip method||boundary conditions||elastic buckling analysis||CUFSM (1)
- Steel hollow sections||in-filled concretes||static test||cyclic test||FEM (1)
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Full-Text Articles in Engineering
A Life-Cycle Assessment Of Cold-Formed Steel Enclosures Verses Alternative Enclosures In Commerical Buildings, K. J. Van, L. Xu
A Life-Cycle Assessment Of Cold-Formed Steel Enclosures Verses Alternative Enclosures In Commerical Buildings, K. J. Van, L. Xu
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In North America, the operation of buildings accounts for approximately one third of the total energy use and greenhouse gas emissions each year. Over the life of a building, the total energy use is a combination of the embodied energy in the building materials and the operating energy of the building. Building enclosures (walls and roofs) have a huge impact on both the embodied energy and the operating energy of buildings. Historically, steel has been blacklisted as a material with a high embodied energy. This has led to a misconception that steel enclosures use significantly more energy than other enclosure …
Behavior And Design Of Axially Compressed Sheathed Wall Studs, L. C. M. Vieira Jr., B. W. Schafer
Behavior And Design Of Axially Compressed Sheathed Wall Studs, L. C. M. Vieira Jr., B. W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The objective of this paper is to summarize efforts in a multi year project dedicated to developing a reliable design method for cold - formed steel wall studs that rely on sheathing for bracing. Testing on single columns with sheathing, and full - scale walls with sheathin g, are summarized. Particular emphasis is placed on the observed limit states given the different sheathing conditions. The sheathing supplies beneficial restraint to the wall studs and the stiffness of this sheathing - based restraint is characterized exper imentally and analytically. A unique application of the Direct Strength Method of design is explored …
Lateral Torsional Instability Of Single Channels Restrained By Angle Cleats, G. M. Bukasa, M. Dundu Masce
Lateral Torsional Instability Of Single Channels Restrained By Angle Cleats, G. M. Bukasa, M. Dundu Masce
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A series of experiments on the lateral tors ional instability of single channels is presented. The channels are restrained by a purlin – angle cleat connection and subjected to a two point loading system in order to simulate a distributed load. Failure of the channels occurred by local buckling of the compression zone of the flange and web and lateral torsional buckling of the channels between points of lateral support. Tests have shown the purlin–angle cleat connection to be capable of restraining the frames from failing due to lateral-torsional buckling. This eliminates the idea of having fly-bracings, which is normally …
Extending Direct Strength Design To Cold-Formed Steel Beams With Holes, Christopher D. Moen, Benjamin W. Schafer
Extending Direct Strength Design To Cold-Formed Steel Beams With Holes, Christopher D. Moen, Benjamin W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The extension of the American Iron and Steel Institute’s Direct Strength Method (DSM) to cold-formed steel beams with holes is nearly in place. DSM was first introduced to th e AISI specification in 2004 as an alternative to the effective width met hod, and is widely considered a major advancement in cold-formed steel component design. In DSM, the beam elastic buckling properties for a general cross-section are obtained with a computer analysis utilizing the finite strip method. A disadvantage of the finite strip method and DSM has been that discrete holes along the member length could not be easily accounted …
Load-Carrying Capacity Estimation On Cold-Formed Thin-Walled Steel Columns With Built-Up Box Section, Yuangqi Li, Xingyou Yao, Zuyan Shen, Rongkui Ma
Load-Carrying Capacity Estimation On Cold-Formed Thin-Walled Steel Columns With Built-Up Box Section, Yuangqi Li, Xingyou Yao, Zuyan Shen, Rongkui Ma
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The use of cold-formed thin-walled steel structural members has increased in recent years, and most of their sections are open section with only one symmetrical axis, which would likely fail by twisting and interaction with the others buckling mode, such as local buckling and distortional buckling. To improve the ultimate strength of columns, built-up box section can be used. In this paper, a series of loading capacity tests on high-strength cold- formed steel columns with built-up bo x section are presented, including 21 axially-compressed columns and 19 eccentrically-compressed columns sub- jected to bending moments about weak axis as well as …
Flexural And Cyclic Behaviour Of Hollow And Concrete-Filled Steel Tubes, S. Arivalagan, S. Kandasamy
Flexural And Cyclic Behaviour Of Hollow And Concrete-Filled Steel Tubes, S. Arivalagan, S. Kandasamy
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents a study on the flexural and cyclic behaviour of concrete filled steel hollow beam sections. The specimens in-filled with normal mix concrete, fly ash concrete, quarry waste concrete and low strength concrete (Brick-bat-lime concrete) and hollow steel sections were tested. Measurements of strains and deflections were made under two-point loading. A theoretical model was also developed to predict the moment carrying capacity. The capacities of the beams were compared with the ultimate capacity obtained using the international standards EC4-1994, ACI-2002 and AISC-LRFD-1999. The result of the experimental investigation showed that the moment carrying capacity increases based on …
Improvements To The Fire Performance Of Light Gauge Steel Floor Systems, B. Baleshan, M. Mahendran
Improvements To The Fire Performance Of Light Gauge Steel Floor Systems, B. Baleshan, M. Mahendran
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Light gauge steel frame (LSF) struct ures are increasingly used in commercial and residential build ings because of their non- combustibility, dimensional stability and ease of installation. A common application is in floor-ceiling systems. The LSF floor-ceiling systems must be designed to serv e as fire compartment boundaries and provide adequate fire resistance. Fire-rated floor-ceiling assemblies have been increasingly used in buildings. However, limited research has been undertaken in the past and hence a thorough understanding of their fire resistance behaviour is not available. Recently a new composite floor-ceilin g system has been developed to provide higher fire rating. But …
Shear Behavior Of Screw Connections For Cold-Formed Thin-Walled Steel Structures, Yuangqi Li, Xingyou Yao
Shear Behavior Of Screw Connections For Cold-Formed Thin-Walled Steel Structures, Yuangqi Li, Xingyou Yao
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Self-drilling screws are the primary mean s to fasten cold-formed thin-walled steel members in construction. There are several failure modes for shear connections with self-drilling screws, including screw tilting, hole bearing, edge tearing, tensile fracture in net s ection of connected elements and shear fracture of screws. Meanwhile, the “g roup effect” will exist when a large number of screws are used in a shear connection. A series of tests (75 specimens) on single lap shear connections with self-drilling screws has been carried out and the results report ed in this paper. The end distance, screw spacing, pattern of screws …
Evaluation Of The Flexural Strength Of Cold-Formed Steel Studs With Embossed Flanges, K. B. Reynolds, S. F. Stephens, Roger A. Laboube
Evaluation Of The Flexural Strength Of Cold-Formed Steel Studs With Embossed Flanges, K. B. Reynolds, S. F. Stephens, Roger A. Laboube
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
New advances and improvements in the manufacture of cold-formed steel shapes are continually being made. One such advancement in the manufacturing of steel studs is flange embossing, a technique used to facilitate the installation of drywall screws into the stud flange. Currently, embossed flanges are not specifically addressed in the North American Specification for the Design of Cold-Formed Steel Structural Members (AISI S100), thereby drawing into question the use of current design equations from being used to calculate member properties for an embossed stud. A limited experimental investigation was undertaken to determine if light flange embossing affects the nominal flexural …
Cold-Formed Steel For Students A Website, Roger A. Laboube, C. M. Stratman
Cold-Formed Steel For Students A Website, Roger A. Laboube, C. M. Stratman
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
No abstract provided.
Innovative Damage Control Systems Using Replaceable Energy Dissipating Steel Fuses For Cold-Formed Steel Structures, Fuminobu Ozaki, Yoshimichi Kawai, Hiroshi Tanaka, Tadayoshi Okada, Ryoichi Kanno
Innovative Damage Control Systems Using Replaceable Energy Dissipating Steel Fuses For Cold-Formed Steel Structures, Fuminobu Ozaki, Yoshimichi Kawai, Hiroshi Tanaka, Tadayoshi Okada, Ryoichi Kanno
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes the development of innovative seismic technologies for cold-formed steel structures; a rocking steel shear wall system with replaceable energy dissipating steel fuses for low rise housing units. In this system, the fuses are placed at the base of a folded-steel sheet wall connecting an anchor bolt and the steel sheet wall. It is designed so that most of the earthquake energy can be dissipated by plastic deformation of the fuse elements, while the shear wall remains intact and resists vertical and horizontal forces caused by large earthquakes. As expected in seismic events, the fuses at the base …
Shear Behaviors Of Light-Gauge Composite Walls Under Monotonic And Cyclic Loading, Yuangqi Li, Fei Liu, Zuyan Shen, Xingyou Yao
Shear Behaviors Of Light-Gauge Composite Walls Under Monotonic And Cyclic Loading, Yuangqi Li, Fei Liu, Zuyan Shen, Xingyou Yao
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Shear properties of cold-formed thin-walled steel composite walls are af- fected by many factors, including the section of light-gauge studs, the space of self-drilling screws, the panel on both sides of wall, the distribution of hold down device, etc, which makes it is difficult to estimate the shear strength. In this paper, twelve Q345 light-gauge composite wall specimens with a dimension of 2400mm wide and 3000mm high were designed for shear capacity test. Two kinds of panel combination in the specimens were considered, one is gypsum board on one side and OSB board on another side, the other is gypsum …
On The Direct Strength Design Of Continuous Cold-Formed Steel Beams, Cilmar Basaglia, Dinar Camotim
On The Direct Strength Design Of Continuous Cold-Formed Steel Beams, Cilmar Basaglia, Dinar Camotim
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The work reported in this paper concerns an ongoing investigation aimed at developing an efficient methodology to design continuous cold-formed steel beams failing in modes that combine local, distortional and global features. At this stage, it is intended to assess how accurately can the load-carrying capacity of lipped channel continuous (two and three-span) beams subjected to non-uniform bending be predicted by means of the current Direct Strength Method (DSM) design curves. “Exact” ultimate strength values yielded by geometrically and materially non-linear shell finite element analyses are compared with estimates provided by the DSM equations and, on the basis of this …
Overview Of Recent Changes And Additions To Aisi Standards, Helen Chen, Roger Brockenbrough, Richard Haws
Overview Of Recent Changes And Additions To Aisi Standards, Helen Chen, Roger Brockenbrough, Richard Haws
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Since the publication of the 2007 edit ions of AISI standards, changes and additions have been made to some of the standards. This paper will provide an overview of the majo r revisions to those standards.
Review Of Aisi Design Guide For Cold-Formed Steel Purlin Roof Framing Systems-Component Stiffness Method, Michael W. Seek
Review Of Aisi Design Guide For Cold-Formed Steel Purlin Roof Framing Systems-Component Stiffness Method, Michael W. Seek
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper reviews the Component Stiffness Method for determining anchorage forces in roof systems as presen ted in Chapter 5 of the new AISI Design Guide for Cold-Formed Steel Purlin Roof Framing Systems . The four steps in the general methodology of the component stiffness method are presented. First, the development of forces requiring an chorage in purlin roof systems is discussed. Next, calculation of the stif fness of each of the components of the roof system and the procedure for distributing these forces through the system is presented. The final step, evaluation of the effectiveness of the anchors in …
Steel Roof Deck Diaphragms On Cold-Formed Steel Framing, Thomas Sputo
Steel Roof Deck Diaphragms On Cold-Formed Steel Framing, Thomas Sputo
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
No abstract provided.
The 2008 Aisi Cold-Formed Steel Design Manual, Richard C. Kaehler, Helen Chen
The 2008 Aisi Cold-Formed Steel Design Manual, Richard C. Kaehler, Helen Chen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The 2008 edition of the AISI Cold-Formed Steel Design Manual has been published. The new edition includes updated examples and design aids as well as newly developed example problems and design aids covering new material in the 2007 edition of the North American Specification for the Design of Cold-Formed Steel Structural Members . Also included are all current AI SI structural Test Standards.
Cross-Aisle Stiffness Tests On Rack Upright Frames, S. R. Sajja, R. G. Beale, M. H. R. Godley
Cross-Aisle Stiffness Tests On Rack Upright Frames, S. R. Sajja, R. G. Beale, M. H. R. Godley
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The US Rack Manufacturers Institution (RMI) code uses a theoretical formula derived by Timoshenko and the new Eurocode EN15512 requires testing. There is a considerable difference in the stiffn ess values determined by two approaches. This paper describes the experiments conducted on 80 full sized upright frames at Oxford Brookes University varying upright size, number of panels in the frame, aspect ratio of the panel (panel length/depth), restraints at the intermediate nodes of the frame, loading pattern, lacing pattern (channels back to back or front to front) and bolt tightness. The experimental data reported can be used in proposing revised …
Frame Analysis And Design Of Industrial Cold-Formed Steel Racks, Teoman Pekoz, Ali Karakaplan, Ali Koç
Frame Analysis And Design Of Industrial Cold-Formed Steel Racks, Teoman Pekoz, Ali Karakaplan, Ali Koç
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Industrial cold-formed steel racks have semi-rigid joints between the columns and beams. Frame analysis of such structures call for special considerations that are studied in this paper. The current design approach uses a linear idealization of the moment-rotation relation relationship based on an empirically decided secant to the nonlinear moment rotation curve. This study presents a refined analytical approach to the analysis such frames using the state-of-art finite elemen t based nonlinear analysis program LARSA 4D. Parametric studies are carri ed out to obtain an accurate design approach for usin g computer programs that treat linear moment-rotation relationships.
Experimental Investigation On 6 Feet Wide Cold-Formed Steel Framed Shear Walls With Steel Sheet Sheathing, Cheng Yu, Yujie Chen
Experimental Investigation On 6 Feet Wide Cold-Formed Steel Framed Shear Walls With Steel Sheet Sheathing, Cheng Yu, Yujie Chen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An AISI sponsored research project on the performance of 6 feet wide cold- formed steel (CFS) framed shear walls with single sided steel sheet sheathing is recently completed at the Un iversity of North Texas. This research project is aimed at determining the required seismic detailing for 6 feet wide 8 feet high CFS shear walls using two steel sheets, one is 4 feet wide, and the other is 2 feet wide. Both monotonic and cyclic tests are conducted and various parameters in the framing and sheathing details are considered in the test program. Those parameters include framing member thickne …
Experimental Evaluation Of A Vehicular Access Door Subjected To Hurricane Force Wind Pressures, Tian Gao, Christopher D. Moen
Experimental Evaluation Of A Vehicular Access Door Subjected To Hurricane Force Wind Pressures, Tian Gao, Christopher D. Moen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper describes an experimental study of a rolling sheet door under uniform positive and negative pressure, i.e. wind pushing the door into the building and wind suction pulling the door out of the building. Rolling sheet vehicular access doors are a commonly provided feature in metal building systems. The edges of the door slide freely during regular usage in tracks connected to cold-formed steel jambs. During an extreme wind event, the door engages the jambs with wind locks distributed along both vertical edges of the door to prevent excessive out-of-plane deformation. The goal of the study was to measure …
Performance Of Knee-Braced Cold-Formed Steel Shear Walls Subjected To Lateral Cyclic Loading, Mehran Zeynalian Dastjerdi, Hamid Reza Ronagh
Performance Of Knee-Braced Cold-Formed Steel Shear Walls Subjected To Lateral Cyclic Loading, Mehran Zeynalian Dastjerdi, Hamid Reza Ronagh
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Light weight Steel Framed structures currently in use in Australia, are normally braced using face mounted thin straps, cross braces that are of the same shape as studs, or compressed cement boards screwed to the face of the walls. While these are found adequate in low seismic regions of Australia, an investigation into the earthquake resistance properties of LSF have led authors to investigate alternative bracing types that may present a more favourable ductility. Knee braces that are specially designed for this purpose are introduced in the paper and studied in a specially designed testing rig. The tests are on …
20th International Specialty Conference: Recent Research And Developments In Cold-Formed Steel Structures, Wei-Wen Yu Center For Cold-Formed Steel Structures
20th International Specialty Conference: Recent Research And Developments In Cold-Formed Steel Structures, Wei-Wen Yu Center For Cold-Formed Steel Structures
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
No abstract provided.
Impact Of Corner Radius On Cold-Formed Steel Member Strength, V. Zeinoddini, B. W. Schafer
Impact Of Corner Radius On Cold-Formed Steel Member Strength, V. Zeinoddini, B. W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The objectives of this paper are to expl ore (a) how corners of cold-formed steel members are included or ignored in current design methods, and (b) the effectiveness of recent proposals for modifying the strength prediction for local buckling to account for corners. The imp act of round corners is examined on the behavior and strength of isolated elements and on full members using material and geometric nonlinear collapse analysis with shell finite elements in ABAQUS. Comparisons between the available methods and the nonlinear finite element analysis are completed to explore the regimes in which the methods are accurate, as …
Buckling Analysis Of Cold-Formed Steel Members With General Boundary Conditions Using Cufsm Conventional And Constrained Finite Strip Methods, Z. Li, B. W. Schafer
Buckling Analysis Of Cold-Formed Steel Members With General Boundary Conditions Using Cufsm Conventional And Constrained Finite Strip Methods, Z. Li, B. W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The objective of this paper is to provide the theoretical background and illustrative examples for elastic buckling analysis of cold-formed steel members with general boundary conditions as implemented in the forthcoming update to CUFSM. CUFSM is an open source finite strip elastic stability analysis program freely distributed by the senior author. Although the finite strip method presents a general methodology, the conventional implementation (e.g. CUFSM v 3.13 or earlier) employs only simply-supported boundary conditions. In this paper, utilizing specially selected longitudinal shape functions, the conventional finite strip method is extended to general boundary conditions, including the conventional case: simply-simply supported, …
Angle Cleat Base Connections, M. Dundu, S. Maphosa
Angle Cleat Base Connections, M. Dundu, S. Maphosa
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Tests, performed on base connections fabricated from cold-formed channels and hot-rolled angle cleats, are presented in this paper. This research is part of an on- going research to develop portal frames made out of cold-formed steel. The base connections are subjected to an axial load and moment. Hot-rolled angle cleats are used to prevent premature failing of the base connections. Several loading configurations are considered and these are dependent on the eccentricity of the load. In all the tests the cold-formed channels failed by local buckling. A significant amount of bearing distortion was observed in the heavily loaded flange. The …
Arc-Spot Welds For Multi-Overlap Roof Deck Panels, N. Guenfoud, R. Tremblay, C. A. Rogers
Arc-Spot Welds For Multi-Overlap Roof Deck Panels, N. Guenfoud, R. Tremblay, C. A. Rogers
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Roof deck construction often incorporates cold-formed steel panels that are connected to the underlying framing with the use of arc-spot welds. The welds are commonly located in areas where multiple layers of roof deck exist, such as at sidelaps or endlaps. CSA S136 restricts the use of multi-layer connections to being less than 2.5 mm thick; as well, the thickness of the supporting steel must exceed 2.5 times the aggregate thickness of the deck. In effect, the standard does not allow for the use of arc-spot welds for 18 ga (1.21 mm) and 16 ga (1.52 mm) roof deck panels. …
Cfsei Educating North American Practitioners In Principles Of Cfs Framing Design, W. D. Allen
Cfsei Educating North American Practitioners In Principles Of Cfs Framing Design, W. D. Allen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Educating North American structural engi neers in the principles of cold-formed steel (CFS) design in general, and about CFS framing in particular, has a unique set of challenges. The undergraduate curri cula virtually ignore the subjects, and only a handful of graduate programs address the issue. Several industry associations have existed for engineers, but none specialize in CFS framing. Several organizations existed in the co ld-formed steel framing marketplace, but none were set up to accommodate engi neers. This paper will review the formation, development, growth, and maturation of one such education- and engineer-focused organization within the framework of the …
Cold Formed Steel Tension Members With Two And Three Staggered Bolts, D. M. Fox, R. M. Schuster
Cold Formed Steel Tension Members With Two And Three Staggered Bolts, D. M. Fox, R. M. Schuster
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The second edition of the North American Specification for the Design of Cold Formed Steel Structural Members was published in October of 2007 for use in Canada, Mexico, and the United States. This Specification contains two country specific a ppe ndices, namely Appendix A (ANSI/AISI S100- 07) for use in the US and Mexico and Appendix B (CSA S136- 07) for use in Canada. Both Appendix A and B require that a bolt stagger reduction factor of 0.90 be used when calculating the tearing failure strength [resistance] of a cold formed steel member in tension with staggered bolts. This 10% …
Screw Connections Subject To Tension Pull-Out And Shear Forces, R. M. Francka, R. A. Laboube
Screw Connections Subject To Tension Pull-Out And Shear Forces, R. M. Francka, R. A. Laboube
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Currently, the behavior of screw connections subject to combined tension pull- out and shear forces is not well understood. An experimental study was conducted at Missouri Un iversity of Science and Technology to better understand the relationship or interac tion between these forces. The test program evaluated four parameters that may influence the behavior of pure tension and pure shear in screw connections: the thickness of the sheet not in contact with the screw head, the ultimate strength of the steel, the ductility of the steel, and the screw diameter. Based on the behavior observed and analysis of the test …