Cold-Formed Lean Duplex Stainless Steel Rectangular Hollow Sections In Combined Compression And Bending,
2014
Missouri University of Science and Technology
Cold-Formed Lean Duplex Stainless Steel Rectangular Hollow Sections In Combined Compression And Bending, Yuner Huang, Ben Young
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An experimental investigation of cold-formed lean duplex stainless steel members in combined compression and minor axis bending is performed. The test specimens were cold-rolled from flat strips of lean duplex stainless steel grade EN 1.4162 into two rectangular hollow sections. Different eccentricities were applied to the rectangular hollow sections, so that a beam-column interaction curve for each series of test can be obtained. Initial overall geometric imperfections of the members were measured prior to testing. The ultimate loads and the failure modes of each specimen were obtained. Failure modes include flexural buckling as well as interaction of local and flexural …
Steel Deck Institute Design Manuals For Floor And Roof Deck,
2014
Missouri University of Science and Technology
Steel Deck Institute Design Manuals For Floor And Roof Deck, Thomas Sputo
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The Steel Deck Institute (SDI) has developed new design manuals to assist in the use of their consensus floor and roof deck standards. The SDI Floor Deck Design Manual, 1st Edition (FDDM) is based on the requirements of the ANSI/SDI NC-2010 Standard for Non-composite Steel Floor Deck and the ANSI/SDI C-2011 Standard for Composite Steel Floor Deck-Slabs. The SDI Roof Deck Design Manual, 1st Edition (RDDM) is based on the requirements of the ANSI/SDI RD-2010 Standard for Steel Roof Deck. Both manuals contain information on available deck profiles and finishes, and design and installation information. Additionally, both manuals …
Cold-Formed Steel Channel Sections With Web Stiffeners Subjected To Local And Distortional Buckling — Part Ii: Parametric Study And Design Rule,
2014
Missouri University of Science and Technology
Cold-Formed Steel Channel Sections With Web Stiffeners Subjected To Local And Distortional Buckling — Part Ii: Parametric Study And Design Rule, Liping Wang, Ben Young
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A parametric study of cold-formed steel channel sections with web stiffeners subjected to bending was performed using finite element analysis (FEA). An accurate finite element model was used for the parametric study. The parametric study included 75 beams of plain and lipped channel sections with web stiffeners. The beams were simply supported and subjected to four-point bending. The strengths and failure modes of specimens obtained from experimental and FEA results were compared with design strengths predicted using the direct strength method (DSM) specified in the North American Specification for cold-formed steel structures. The comparison shows that the design strengths predicted …
Aisi Newly Developed Standard Aisi S310-13, North American Standard For The Design Of Profiled Steel Diaphragm Panels,
2014
Missouri University of Science and Technology
Aisi Newly Developed Standard Aisi S310-13, North American Standard For The Design Of Profiled Steel Diaphragm Panels, John Mattingly, Helen Chen
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
AISI S310, North American Standard for the Design of Profiled Steel Diaphragm Panels, has been approved by AISI consensus committee and approved by American National Standard Institute (ANSI) as American National Standard (ANS). This standard determines the resistance and stiffness of steel panels with or without concrete-fills, and the resistance and stiffness of connections in a diaphragm. Both analytical and test methods are provided in the standard. In this paper, a brief review of the background information and design provisions is provided.
The Effects Of End Conditions On The Load Capacity Of Cold-Formed Steel Column Members Of Lipped Channel Cross-Section With Perforations Subjected To Compression Loading,
2014
Missouri University of Science and Technology
The Effects Of End Conditions On The Load Capacity Of Cold-Formed Steel Column Members Of Lipped Channel Cross-Section With Perforations Subjected To Compression Loading, Martin Macdonald, Muditha P. Kulatunga
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The effects of end boundary conditions on the compressive load carrying capacity of cold-formed lipped channel sections with perforations are investigated and discussed. Most structural cold-formed steel members are typically manufactured with perforations. These perforations are pre-cut to accommodate electrical, plumbing, and heating services and so on. Due to the size, shape, and position of perforations and end conditions, ultimate strength and elastic stiffness of a structural member can be varied. This paper describes the ultimate strength results obtained from numerical, experimental, and theoretical investigations for two types of end conditions namely, flat-end and fixed-fixed. The numerical results given have …
22nd International Specialty Conference: Recent Research And Developments In Cold-Formed Steel Structures,
2014
Missouri University of Science and Technology
22nd 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.
Finite Element Analysis Of Cold-Formed Dimpled Steel Columns,
2014
Missouri University of Science and Technology
Finite Element Analysis Of Cold-Formed Dimpled Steel Columns, V. B. Nguyen, M. A. English, M. A. Castellucci
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Dimpled steel products are produced from the combination of an innovative dimpling process and a traditional forming process such as cold-roll forming or press-braking. The wider use of cold-formed dimpled steel members has promoted considerable interest in the local instability and strength of these members. Of particular interest is their buckling behaviour and ultimate strength capacity. However, the dimpling process produces cold-formed sections with a complex ‘dimpled’ surface topography and the ‘dimpled’ material is nonuniformly work hardened through the entire thickness. Owing to these complex issues, there are no existing methods to calculate the buckling strength of the dimpled products …
Compressive Strength Of Cold-Formed Steel C-Shape Columns With Slotted Holes,
2014
Missouri University of Science and Technology
Compressive Strength Of Cold-Formed Steel C-Shape Columns With Slotted Holes, L. Xu, Y. Shi, S. Yang
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Presented in this paper is an experimental investigation on the effect of web holes on the strength of cold-formed steel (CFS) C-shape columns. A total of 18 CFS C-shape stub columns were tested without and with web holes. The column length and web height of C-shape section were 490 mm (19 in) and 150 mm (6 in), respectively; and the lengths of the holes investigated were 74 mm (3 in), 114 mm (4.5 in) and 130 mm (5 in) whereas the width of the holes remains as 38 mm (1.5 in). It is noted that for the strength determination of …
On The Influence Of Local-Distortional Interaction In The Behavior And Design Of Cold-Formed Steel Web-Stiffened Lipped Channel Columns,
2014
Missouri University of Science and Technology
On The Influence Of Local-Distortional Interaction In The Behavior And Design Of Cold-Formed Steel Web-Stiffened Lipped Channel Columns, André D. Martins, Pedro Borges Dinis, Dinar Camotim, Paulo Providência
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper reports the results of a numerical (ABAQUS shell finite element analysis) investigation on the influence of local-distortional (L-D) interaction in the ultimate strength and design of cold-formed steel fixed-ended web-stiffened lipped channel columns -- hereafter termed “WSLC columns”. These results concern columns with various geometries and yield stresses, ensuring a wide variety of combined ratios between (i) the distortional and local critical buckling stresses, and (ii) the yield and the higher of the above buckling stresses. The objectives of this work are two-fold: (i) to acquire in-depth understanding on the mechanics underlying the L-D interaction in the WSLC …
Numerical Studies On The Composite Action And Buckling Behavior Of Built-Up Cold-Formed Steel Columns,
2014
Missouri University of Science and Technology
Numerical Studies On The Composite Action And Buckling Behavior Of Built-Up Cold-Formed Steel Columns, Davide C. Fratamico, Benjamin W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An exploratory study is performed herein on the global, local, and distortional buckling behavior of built-up cold-formed steel members constructed using industry standard lipped channel sections. The stability characteristics of these columns under concentric axial compressive loads offers insights on member assembly (e.g. fastener spacing), and on the prediction of buckling loads (e.g., section rigidities) used in design formulations. Currently, built-up column buckling is determined using a modified flexural slenderness ratio, which reduces the buckling capacity in part due to a loss of shear rigidity in the overall member’s interconnections. In this paper, a numerical study is performed to analyze …
Gbtul 2.0 −A New/Improved Version Of The Gbt-Based Code For The Buckling Analysis Of Cold-Formed Steel Members,
2014
Missouri University of Science and Technology
Gbtul 2.0 −A New/Improved Version Of The Gbt-Based Code For The Buckling Analysis Of Cold-Formed Steel Members, Rui Bebiano, Dinar Camotim, Rodrigo Gonçalves
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents the very recent 2.0 release of software GBTUL – a computer code developed by the authors and made available as freeware at the website of the Department of Civil Engineering of the Technical University of Lisbon (Bebiano et al. 2013). The program performs linear buckling and vibration analyses of thin-walled bars based on Generalized Beam Theory (GBT), a bar theory that accounts for cross-section deformation. Its domain of application is much wider than that of the previous release (1.0ß): indeed, it is now possible to analyze single or multi-span members (i) with various support conditions, including those …
Shape Optimisation Of Cold-Formed Steel Profiles With Manufacturing Constraints - Part I: Algorithm,
2014
Missouri University of Science and Technology
Shape Optimisation Of Cold-Formed Steel Profiles With Manufacturing Constraints - Part I: Algorithm, Bin Wang, Benoit P. Gilbert, Adrien M. Molinier, Hong Guan, Lip H. Teh
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents a Genetic Algorithm optimisation method with manufacturing constraints for shape optimisation of cold-formed steel (CFS) profiles. Previous studies on unconstrained shape optimization of CFS crosssections, where the sole aim was to optimise the weight-to-capacity ratio of the profiles, yielded cross-sections that cannot be manufactured. Current coldforming processes, such as roll-forming and brake-pressing, have limited ability to form continuously curved surfaces without discrete bends. This paper defines simple manufacturing rules and introduces them into the evolutionary algorithm. Augmented Lagrangian constraint-handling technique, with equality and inequality constrained violations, is used to avoid ill-conditioned problems. The ability and accuracy of …
Shape Optimisation Of Cold-Formed Steel Profiles With Manufacturing Constraints - Part Ii: Applications,
2014
Missouri University of Science and Technology
Shape Optimisation Of Cold-Formed Steel Profiles With Manufacturing Constraints - Part Ii: Applications, Bin Wang, Benoit P. Gilbert, Adrien M. Molinier, Hong Guan, Lip H. Teh
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper uses the Genetic Algorithm (GA)-based optimisation method for cold-formed steel (CFS) profiles with manufacturing constraints, developed in the companion paper, to shape-optimise simply-supported and singly-symmetric open-section columns. Having a uniform wall thickness of 0.047 inch (1.2 mm), the columns are subjected to a compressive axial load of 16,860 lbf (75kN) and optimised for yielding and global buckling. Column lengths ranging from 3.28 ft (1,000 mm) to 9.84 ft (3,000 mm) are investigated. The algorithm is run with and without considering the manufacturing constraints. Differences between the two types of cross-sections, i.e. manufacturable and non-manufacturable, are evaluated. The influence …
Understanding The Global Buckling Behavior Of Thin-Walled Members With Slotted Web,
2014
Missouri University of Science and Technology
Understanding The Global Buckling Behavior Of Thin-Walled Members With Slotted Web, B. Geleji, M. Szedlák, D. Visy, S. Ádány
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In this paper flexural buckling of thin-walled members with holes are discussed. Members with few but large openings, as well as with slotted webs are studied. Large number of finite element analyses has been performed, by using a carefully constrained shell finite element model in order to exclude the distortion of the cross-section, which makes it possible to analyze flexural buckling separately from other modes. Based on the results general conclusions are drawn regarding the global behavior of members with holes. Moreover, analytical models are developed for column members with slotted webs, with neglecting or with considering the effect of …
Improved Effective Width Method Considering Distortional Buckling For Cold-Formed Thin-Walled Steel Members With Lipped Channel Section,
2014
Missouri University of Science and Technology
Improved Effective Width Method Considering Distortional Buckling For Cold-Formed Thin-Walled Steel Members With Lipped Channel Section, Xingyou Yao, Yuanqi Li
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The local buckling, distortional buckling, and overall buckling would occur for cold-formed thin-walled steel members with lipped channel section. The effective width method is used to considering the effect of local and distortional buckling on load-carrying capacity of member in Chinese code. Especially, a very conservative stability coefficient of partially stiffened elements used to considering the local buckling and distortional buckling of flange of lipped channel sections. In this paper, the half-wave length, the elastic buckling stress of distortional-buckling of cold-formed thin-walled steel members with lipped channel section and the corresponding stability coefficient of partially stiffened elements were developed based …
Laser Scanning To Develop Three-Dimensional Fields For The Precise Geometry Of Cold-Formed Steel Members,
2014
Missouri University of Science and Technology
Laser Scanning To Develop Three-Dimensional Fields For The Precise Geometry Of Cold-Formed Steel Members, Xi Zhao, Benjamin W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Geometric imperfections play an important role in the performance and behavior of cold-formed steel members. The objective of this paper is to detail a newly developed imperfection measurement rig, where the full three-dimensional (3D) imperfect geometry of a cold-formed steel member can be measured and reconstructed. The measurement results in a dense three-dimensional point cloud that may be utilized to provide precise knowledge of the basic member dimensions (width, angle, radius including variation along the length), frequency content in the member (waviness, local dents, etc.), or directly as the exact geometry of the member. Practical applications of the data include …
Tailoring Compression Performance Of Cold-Formed Steel Columns,
2014
Missouri University of Science and Technology
Tailoring Compression Performance Of Cold-Formed Steel Columns, Talha Ekmekyapar, M. Tolga Göğüş, Mustafa Özakça
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Since thin-walled structural analysis and design procedures are utilized for cold-formed steel columns, it is first necessary to understand thin plate behavior to employ proper cross sections which will serve under compression actions. As is well known, thin plates without any longitudinally and/or laterally stiffening elements usually are not present in structural applications. These stiffening elements significantly improve local buckling and collapse characteristics of plates, providing optimized solutions in terms of strength and cost. In cold-formed steel industry there exist some tailoring methods for columns to use the cross-section material more effectively. Designing lipped channels instead of plain ones or …
Cold-Formed Steel Lipped Channel Columns Undergoing Local-Distortional-Global Interaction: Experimental And Numerical Investigation,
2014
Missouri University of Science and Technology
Cold-Formed Steel Lipped Channel Columns Undergoing Local-Distortional-Global Interaction: Experimental And Numerical Investigation, Eliane S. Santos, Pedro Borges Dinis, Eduardo M. Batista, Dinar Camotim
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Experimental and numerical results concerning the post-buckling behavior and strength of fixed-ended cold-formed steel lipped channel columns experiencing interaction involving local, distortional and global buckling (i.e., stemming from the closeness between the critical buckling stresses associated with these three buckling mode types), are reported. After briefly addressing the column specimen geometry selection, the paper presents and discusses the results of an experimental investigation carried out at COPPE, Federal University of Rio de Janeiro (UFRJ, Brazil) and involving 16 columns − its output consists of steel material properties, initial imperfection measurements, equilibrium paths and failure loads/modes. Then, some test results are …
Cold-Formed Steel Channel Sections With Web Stiffeners Subjected To Local And Distortional Buckling — Part I: Tests And Finite Element Analysis,
2014
Missouri University of Science and Technology
Cold-Formed Steel Channel Sections With Web Stiffeners Subjected To Local And Distortional Buckling — Part I: Tests And Finite Element Analysis, Liping Wang, Ben Young
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
An experimental investigation of simply supported beams with two different stiffened channel sections has been conducted under both four-point bending and three-point bending about the major axis of the sections. Stiffeners were employed to the web of plain channel and lipped channel sections to improve the flexural strength of cold-formed steel sections that are prone to local buckling and distortional buckling. In this study, the channel sections were brake-pressed from high strength zinc-coated grades G500 and G550 structural steel sheets with nominal 0.2% proof stresses of 500 and 550 MPa, respectively. The high strength stiffened channel sections had the thicknesses …
Numerical Studies Of Rivet-Fastened Rectangular Hollow Flange Channel Beams,
2014
Missouri University of Science and Technology
Numerical Studies Of Rivet-Fastened Rectangular Hollow Flange Channel Beams, R. Siahaan, P. Keerthan, M. Mahendran
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The rivet-fastened rectangular hollow flange channel beam (RHFCB) is a new cold-formed hollow section proposed as an alternative to welded hollow flange beams. It is a monosymmetric channel section made by rivet-fastening two torsionally rigid rectangular hollow flanges to a web plate. This method will allow the designers to develop optimum sections, with affordable rivet connection between their web and flange elements. In addition to this unique geometry, the rivet-fastened RHFCBs also have unique characteristics relating to their stress-strain characteristics, residual stresses, initial geometric imperfections and hollow flanges that are not encountered in conventional hot-rolled and cold-formed steel channel sections. …
