Experimental Investigation Of Optimized Cold-Formed Steel Compression Members,
2010
Missouri University of Science and Technology
Experimental Investigation Of Optimized Cold-Formed Steel Compression Members, D. J. Klingshirn, E. A. Sumner, N. A. Rahman
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In the past, standard C - shaped metal studs have been the only option for designers and contractors when selecting a cross section for load bearing compression members. T he sigma shaped section has recently emerged as an alternative to the C - section. The sigma shaped section is very similar to the C - shape, with the exception of having an intermediate web return and complex stiffeners. The experimental results of concentric axial compression tests of fifty - eight sigma shaped members are reported. Specimen s were tested at various lengths to force global, distortional, and local buckling failure …
Comparative Behavior Of Built-Up Cold-Formed Box Sections Under Rigid And Flexible End Support Conditions,
2010
Missouri University of Science and Technology
Comparative Behavior Of Built-Up Cold-Formed Box Sections Under Rigid And Flexible End Support Conditions, W. Reyes, F. A. Guzman
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
According to section D1.2 of AISI S100-2007 for compression members composed of two sections in contact whose buckling mode involves shear forces in the connectors, a reduction must be made, KL r ⁄ must be replaced by ሺ KL r ⁄ሻ ୫ . This new modified slenderness ratio takes into account the connection weld spacing and the minimum radius of gyration of an individual shape in the built-up member. Under the provisions of section D1.2 a reduction in load capacity must be made for built-up welded box members, which are the subject of this study. An experimental investigation on 48 …
Theoretical Analysis Of Cold-Formed Steel Battened Double Angle Members Under Compression,
2010
Missouri University of Science and Technology
Theoretical Analysis Of Cold-Formed Steel Battened Double Angle Members Under Compression, W. F. Maia, J. Munaiar Neto, M. Malite
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In Brazil, battened double angle system is one of the systems most used in light truss, however, there are not any specific studies on its behavior, resulting in the fact that the standard procedures do not provide subsidies for the design of this section. Moreover, cold-formed steel si mple angles under compression, mostly with slender legs, have an interesting structural behavior compared to other cold-formed steel shapes. Two critical modes are observed in the elastic stability analysis: (i) global flexural mode in the case of longer members and (ii) a coincident local-plate/global flexural-torsional mode, which is critical for shorter members. …
Direct Strength Design Of Cold-Formed C-Sections For Shear,
2010
Missouri University of Science and Technology
Direct Strength Design Of Cold-Formed C-Sections For Shear, Cao Hung Pham, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The Direct Strength Method (DSM) rece ntly included in the North American Specification and Australian/New Zealand Standard AS/NZS 4600:2005 gives design rules for compression and bending. No rules are presente d at this stage for shear. Two series of tests on C-section can be used to develop and calibrate rules for design in shear. These are the University of Missouri Rolla tests of the 1970’s and recent tests on high strength C-sections at the University of Sydney. Both series of tests use a similar test rig altho ugh different levels of tension field action have been observed. Two features research …
Direct Strength Design Of Cold-Formed C-Sections In Combined Bending And Shear,
2010
Missouri University of Science and Technology
Direct Strength Design Of Cold-Formed C-Sections In Combined Bending And Shear, Cao Hung Pham, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The paper describes a research program including tests on both plain C- and SupaCee ® purlin sections in combined bending and shear, and bending only. The high strength SupaCee ® profile steel sections contain additional return lips and web stiffeners which enhance the bending and shear capacity of the sections. They are used widely in Austra lia as purlins in roof and wall systems. The tests were performed at the University of Sydney with and without straps on the flange and thus allowed distortional buckling in the latter case. Design methods for these sections are normally specified in the Australian/New …
On The Direct Strength Design Of Continuous Cold-Formed Steel Beams,
2010
Missouri University of Science and Technology
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 …
Cross-Aisle Stiffness Tests On Rack Upright Frames,
2010
Missouri University of Science and Technology
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,
2010
Missouri University of Science and Technology
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.
Evaluation Of The Flexural Strength Of Cold-Formed Steel Studs With Embossed Flanges,
2010
Missouri University of Science and Technology
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,
2010
Missouri University of Science and Technology
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.
Impact Of Corner Radius On Cold-Formed Steel Member Strength,
2010
Missouri University of Science and Technology
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 …
Cfsei Educating North American Practitioners In Principles Of Cfs Framing Design,
2010
Missouri University of Science and Technology
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,
2010
Missouri University of Science and Technology
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,
2010
Missouri University of Science and Technology
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 …
Shear Behavior Of Screw Connections For Cold-Formed Thin-Walled Steel Structures,
2010
Missouri University of Science and Technology
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 …
Single Shear Bolted Connection Tests Of G500 1.20mm Thin Sheet Steel At Elevated Temperatures,
2010
Missouri University of Science and Technology
Single Shear Bolted Connection Tests Of G500 1.20mm Thin Sheet Steel At Elevated Temperatures, Shu Yan, Ben Young
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The current design rules on bolted connections of thin sheet steels for cold-formed steel structures are applicable for ambient temperature condition only. Research on such kind of connections at high temperatures is limited. In this study, 47 single shear bolted connection specimens fabricated from G500 1.20mm thin sheet steel and 9 coupon specimens were conducted by using steady state test method in the temperature range from 22ºC to 900ºC. Two failure modes were observed in the single shear bolted connection tests, namely the net section tension, and bearing . The test results were compared with the predicted values calculated from …
Strength Prediction Model For Power Acutated Fasteners Connecting Steel Members In Tension And Shear-North American Applications,
2010
Missouri University of Science and Technology
Strength Prediction Model For Power Acutated Fasteners Connecting Steel Members In Tension And Shear-North American Applications, J. R. Ubejd Mujagic, Perry S. Green, William G. Gould
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Power-actuated fasteners (PAFs), also referred to as pins, are small nail-like or threaded stud t ype connectors. They can be used in conjunction with several materials and in a number of different applications. Typical applications in steel include attachments of deck sh eeting or diaphragms, architectural or mechanical components, or miscellaneous support brackets or connections to supporting steel members. Traditionally, the design strength of the connections featuring power-actuated fasteners has been determined through standardized testing protocols. In the United States, this protocol is embodied in the American Society for Testing and Materials (ASTM) Standard E 1190. The purpose of this …
Study On The Behavior Of Cold-Formed Steel Angle Tension Members,
2010
Missouri University of Science and Technology
Study On The Behavior Of Cold-Formed Steel Angle Tension Members, R. Padmapriya, S. Kandasamy
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel tension members with bolted end connections are frequently used in a variety of structures such as trusses, transmission towers etc. Among all the shapes, angles are widely used. When angle sections are connected with gusset plates and eccentrically loaded, their ultimate load- carrying capacity is influenced by the effect of shear lag. This paper presents the details of an experimental and numerical investigation with a primary objective of studying the effect of shear lag on cold-formed steel single and double angles subjected to tension. Seventy-two single plain and lipped angles made from thicknesses 2,3 and 4 mm connected …
Test And Finite Element Analysis On Distortional Buckling Of Cold-Formed Thin-Walled Steel Lipped Channel Columns,
2010
Missouri University of Science and Technology
Test And Finite Element Analysis On Distortional Buckling Of Cold-Formed Thin-Walled Steel Lipped Channel Columns, Xingyou Yao, Yanli Guo, Zhiguang Huang
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
High-strength cold-formed thin-walled steel sections have been widely used in the recent several years. However, distortional buckli ng or interaction between it and local buckling can occur for high strength cold-formed thin- walled steel members. This paper desc ribes a series of compression tests performed on lipped channel section columns with V-shape intermediate stiffener in the web and flanges fabricated from cold-formed high strength steel of thickness 0.48 and 0.6mm with nominal yield stress 550MPa. The lipped channel sections were tested to failure with both ends of the columns fixed. The test results of 16 specimens show that the local …
Feasibility Study For A Repetitive Member Factor For Cold-Formed Steel Framing Systems,
2010
Missouri University of Science and Technology
Feasibility Study For A Repetitive Member Factor For Cold-Formed Steel Framing Systems, S. Clayton, S. F. Stephens
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel has become a preferred building material for structural framing in many different types of structures, commonly used as repetitive members such as floor joists, roof rafters, roof trusses and wall studs. For wood framed structures with repetitive members, a repetitive member factor increases the allowable bending stress from 1.00 to 1.50 times the reference design value, depending on both the type of material and the type of load. Currently, however, the bending strength of cold-formed steel repetitive members is not permitted to be increased, even though the method of framing is quite similar to that of wood except …
