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Articles 31 - 60 of 224
Full-Text Articles in Structural Engineering
Investigation On Shear Capacity For Screw Connections Of Cold-Formed Steel Framed Shear Walls With Steel Sheathing, Ruoqiang Feng, Ying Ma
Investigation On Shear Capacity For Screw Connections Of Cold-Formed Steel Framed Shear Walls With Steel Sheathing, Ruoqiang Feng, Ying Ma
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Experimental and numerical investigations were carried out to learn the shear capacities for screw connections of cold-formed steel framed shear walls with steel sheets for the base layer combined with gypsum wallboards for the face layer. The design methods of test specimens, the loading equipment and the data processing method were introduced. According the phenomenon of tests for multiple self-drilled screw connections, the loading-deformation curves, shear capacity and failure modes were testified. The influence of end distance of screw, edge distance of screw, diameter of screw, spacing of screw, thickness of steel sheets, thickness of gypsum wallboards, thickness of studs …
Wei-Wen Yu International Specialty Conference On Cold-Formed Steel Structures 2018: Recent Research And Developments In Cold-Formed Steel Design And Construction, Wei-Wen Yu Center For Cold-Formed Steel Structures
Wei-Wen Yu International Specialty Conference On Cold-Formed Steel Structures 2018: Recent Research And Developments In Cold-Formed Steel Design And Construction, 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.
Low Fatigue Response Of Crest-Fixed Cold-Formed Steel Drape Curved Roof Claddings, Krishanu Roy, James B. P. Lim, Amir Mohammad Yousefi, G. Charles Clifton, Mahen Mahendran
Low Fatigue Response Of Crest-Fixed Cold-Formed Steel Drape Curved Roof Claddings, Krishanu Roy, James B. P. Lim, Amir Mohammad Yousefi, G. Charles Clifton, Mahen Mahendran
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel roof claddings are subjected to significant suction/uplift pressures during high wind events. In New Zealand, the strong prevailing winds makes this a common occurrence. Suction pressures are generated by the turbulence of the wind flow around the building which can vary both spatially and temporally. The weakest link in the roofing system is the connection between roof sheeting and screw fasteners, which if fails, can lead to progressive collapse of the whole roofing assembly. Fluctuating high wind suction pressures can result in either static or fatigue pull-through failure of the roof sheeting at its screw fastener connections. Current …
Stressed Skin Design Of Steel Sheeting Panels – Part 1: Shear Resistance And Flexibility Of Screw Lapped Joists, A. M. Wrzesien, James B. P. Lim, I. A. Macleod, R. M. Lawson
Stressed Skin Design Of Steel Sheeting Panels – Part 1: Shear Resistance And Flexibility Of Screw Lapped Joists, A. M. Wrzesien, James B. P. Lim, I. A. Macleod, R. M. Lawson
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The shear resistance and flexibility of a steel roof diaphragm depend largely on shear resistance and slip flexibility of the single screw lap joint. In this paper, screw connections relevant to modern roof construction are investigated. The tests provided experimental values of shear/tearing resistance and joint flexibility of seam connections, cladding/purlin connections and purlin/rafter connections. The novel aspects of the experimental research include investigation of the behaviour of shear connections in 0.5mm thick sheeting and thick-to-thin connections in S550 high tensile steel. Overall, six series of tests were conducted and each test was repeated five times in order to demonstrate …
Stressed Skin Design Of Steel Sheeting Panels – Part 2: Shear Panels With Sheeting Fixed On All 4 Sides, A. M. Wrzesien, James B. P. Lim, I. A. Macleod, R. M. Lawson
Stressed Skin Design Of Steel Sheeting Panels – Part 2: Shear Panels With Sheeting Fixed On All 4 Sides, A. M. Wrzesien, James B. P. Lim, I. A. Macleod, R. M. Lawson
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In this paper, the strength and stiffness of different roof panels were investigated, in order to establish their ability to act as in-plane diaphragms for stressed skin design of cold-formed steel portal frames. A total of 6 roof panels, approximately 3 x 3m, were examined by testing with sheeting profiles fixed on 4 sides. A variety of sheeting profiles in two industry standard thicknesses of 0.5 and 0.7mm were tested, all using top-hat shaped purlins fixed with self-drilling, self-tapping screws. The experimental strength and stiffness of each panel were then compared against existing design methods. The Finite Element Analysis (FEA) …
Computational Modeling Of Joist-To-Ledger Connections In Cold-Formed Steel Diaphragms, Hernan Castaneda, M. Eng, Kara D. Peterson
Computational Modeling Of Joist-To-Ledger Connections In Cold-Formed Steel Diaphragms, Hernan Castaneda, M. Eng, Kara D. Peterson
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel framed buildings can involve a range of options for framing systems, including balloon framing, platform framing, and ledger framing. Transfer of lateral forces from the diaphragms to the wall system (and ultimately to the ground) depends on the interactions within the wall-diaphragm connection, which is dependent on choice of framing system. In ledger framing, floor joists are hung from top of wall studs via a rim track (ledger) and clip angle connection. Recent experimental efforts at Johns Hopkins University studied the wall-diaphragm connection with the goal of quantifying its contribution to overall diaphragm response. Results from these experiments …
Effect Of Connection Details On The Cyclic Behavior Of Nestable Screw Sidelaps, S. Torabian, H. Folk, Benjamin W. Schafer
Effect Of Connection Details On The Cyclic Behavior Of Nestable Screw Sidelaps, S. Torabian, H. Folk, Benjamin W. Schafer
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The connection strength and stiffness sensitivity of screwed sidelaps in nestable steel decks to screw installation details has been experimentally explored via cyclic testing. The cyclic behavior of sidelaps has been recently incorporated in the high fidelity modeling and seismic evaluation of the steel deck diaphragm in rigid wall - flexible diaphragm buildings, where “unzipping” a sidelap (loss of a significant number of sidelap connections along a deck edge) could significantly reduce the seismic performance of the whole diaphragm. A total of 24 monotonic and cyclic sidelap tests have been performed in the Thin-Walled Structures Laboratory at Johns Hopkins University. …
Fire Resistance Of Cavity Insulated Light Gauge Steel Framed Walls, Anthony Deloge Ariyanayagam, Mahen Mahendran
Fire Resistance Of Cavity Insulated Light Gauge Steel Framed Walls, Anthony Deloge Ariyanayagam, Mahen Mahendran
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Light-gauge steel framed (LSF) wall systems are made of cold-formed steel studs and tracks and lined with gypsum plasterboards. They are mostly cavity insulated to provide acoustic and thermal performance. Cavity insulation delays the temperature rise across the wall as it restrains the heat transfer. This delays the ambient plasterboard surface temperature rise and thus improves the insulation failure time of LSF walls. However, LSF walls are also used as load bearing walls. Having cavity insulation causes the fire side temperatures to increase rapidly, resulting in a higher temperature gradient across the stud depth. This leads to higher thermal bowing …
Shake Table Testing For Seismic Response Evaluation Of Cold-Formed Steel-Framed Nonstructural Architectural Components, Luigi Fiorino, Bianca Bucciero, Tatiana Pali, Ornella Iuorio, Raffaele Landolfo
Shake Table Testing For Seismic Response Evaluation Of Cold-Formed Steel-Framed Nonstructural Architectural Components, Luigi Fiorino, Bianca Bucciero, Tatiana Pali, Ornella Iuorio, Raffaele Landolfo
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The seismic response evaluation of cold-formed steel-framed nonstructural architectural components was investigated in an experimental campaign carried out within of the research study agreement between Knauf Gips KG and the Department of Structures for Engineering and Architecture of the University of Naples “Federico II”. The main objective of this research was to investigate the seismic performance of drywall nonstructural systems, i.e. cold-formed steel-framed indoor partition walls, outdoor façade walls and suspended ceilings. The present paper deals with the dynamic shake table tests. The tests were carried out on two different typologies of prototypes (Type 1 and Type 2) for a …
Numerical Simulation Of The Thermal And Mechanical Behavior Of Cold-Formed Steel Composite Floor Under Fire Conditions, Jixian Peng, Wei Chen, Jihong Ye, Zhengliu Wang
Numerical Simulation Of The Thermal And Mechanical Behavior Of Cold-Formed Steel Composite Floor Under Fire Conditions, Jixian Peng, Wei Chen, Jihong Ye, Zhengliu Wang
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel (CFS) building structures are generally acknowledged as green and industrialized buildings, and the fire resistance behavior has become an important issue. Previous studies were mainly to investigate the fire performance of load-bearing CFS walls lined with different panels. Based on the finite element (FE) software package, ABAQUS, this paper presented a numerical simulation on a new CFS channel joist – ALC (autoclaved lightweight concrete) composite floor under fire conditions. Finally, the present numerical simulation of CFS composite floor in fire was compared with previous full-scaled fire experiments of such floors. The results showed that the temperature progression of …
Human-Structure Interaction In Cold-Formed Steel Floor Systems: An Analytical Perspective, Sigong Zhang, Lei Xu
Human-Structure Interaction In Cold-Formed Steel Floor Systems: An Analytical Perspective, Sigong Zhang, Lei Xu
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Designing cold-formed steel (CFS) floors to prevent annoying vibrations induced by human activities such as walking is still a challenge because human occupants not only generate impact loads but also behave as dynamical systems that interacting with structures. Such interaction, known as human-structure interaction (HSI), can be significant for lightweight floor systems particularly for the case when the mass of human occupants becomes comparable to those of the floors. The aim of this study was therefore to investigate the HSI in vibration of CFS floors subjected to human walking excitations by using the recently proposed damped plate-oscillator model to predict …
New Web Crippling Design Rules For Cold-Formed Steel Beams, L. Sundararajah, M. Mahendran, P. Keerthan
New Web Crippling Design Rules For Cold-Formed Steel Beams, L. Sundararajah, M. Mahendran, P. Keerthan
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Lipped channel beams (LCBs) and SupaCee sections are commonly used as floor joists and bearers in the construction industry. SupaCee section is one of the cold-formed steel members, which is increasingly used in the building construction sector. It is characterized by unique ribbed web and curved lip elements, and is claimed to be more economical with extra strength than the traditional channel sections. These thin-walled LCBs and SupaCee sections are subjected to specific local and global failures, one of them being web crippling. Several experimental and numerical studies have been conducted in the past to study the web crippling behaviour …
New Proposals For The Direct Strength Method Of Design Of Cold-Formed Steel Beams With Holes In Shear, Song Hong Pham, Cao Hung Pham, Colin A. Rogers, Gregory J. Hancock
New Proposals For The Direct Strength Method Of Design Of Cold-Formed Steel Beams With Holes In Shear, Song Hong Pham, Cao Hung Pham, Colin A. Rogers, Gregory J. Hancock
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In the latest North American Specification for the design of cold-formed steel structural members AISI S100-16, an empirical approach is specified to design beams with web holes in shear. Recently, a Direct Strength Method (DSM) of design for shear for perforated beams with the aspect ratio (shear span / web depth) of 1.0 has been proposed. This paper presents a comprehensive review of the proposal and an experimental validation using a test series on beams with the aspect ratio of 2.0 and with various square and circular web opening sizes conducted at the University of Sydney, and other experimental data …
Experimental Investigation Into The Behavior Of Back-To-Back Gapped Built-Up Cold-Formed Steel Channel Sections Under Compression, Krishanu Roy, Tina Chui Huon Ting, Hieng Ho Lau, James B. P. Lim
Experimental Investigation Into The Behavior Of Back-To-Back Gapped Built-Up Cold-Formed Steel Channel Sections Under Compression, Krishanu Roy, Tina Chui Huon Ting, Hieng Ho Lau, James B. P. Lim
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Back-to-back gapped built-up cold-formed steel channel-sections are used as compression members in cold-formed steel structures, such as trusses, space frames and portal frames etc. Because of the complex and non-uniform cross section of the back-to-back gapped built- up cold-formed steel channel columns, it is difficult to calculate the strength of these sections accurately. Current guidance by the direct strength method in the AISI Specification and the Australian/New Zealand Standard doesn’t include the gap between the back-to-back channels, thus not being able to predict the axial capacities of these sections accurately. In the literature, very few results have been reported for …
Cyclic Performance And Behavior Characterization Of Steel Deck Sidelap And Framing Connections, S. Torabian, D. Fratamico
Cyclic Performance And Behavior Characterization Of Steel Deck Sidelap And Framing Connections, S. Torabian, D. Fratamico
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A wide variety of steel deck sidelaps and framing connections have been experimentally studied to characterize the cyclic performance required in seismic evaluation of steel deck diaphragms. This study intends to provide cyclic test results of common steel deck connections including screw nestable and top arc seam sidelaps; and powder actuated fasteners, arc spot weld, and arc seam weld framing connections. A total of 24 sidelap and 36 framing connection tests have been performed in the Thin-Walled Structures Laboratory at Johns Hopkins University by NBM Technologies. The connection test results have been used to parameterize a nonlinear hysteretic spring element …
Screw And Pin Fastener Tests For Cold-Formed Steel, Brian S. Wilson, Fredrick R. Rutz, James R. Harris
Screw And Pin Fastener Tests For Cold-Formed Steel, Brian S. Wilson, Fredrick R. Rutz, James R. Harris
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Because of limited available information on strength and ease of installation of specific fasteners for a particular application to a steel deck diaphragm, a preliminary testing program comparing the shear strength of commercially available screws and gas-actuated shot pins was conducted by J. R. Harris and Company at the University of Colorado Denver in 2018. A test was designed to explore the behavior and capacity of various fasteners, securing two and three pieces of sheet steel of various thicknesses together. Specimens were fabricated and load tested, with the sheet steel pieces in tension, so the fasteners were subject to shear. …
Sdi Steel Deck On Cold-Formed Steel Framing Design Manual, Thomas Sputo
Sdi Steel Deck On Cold-Formed Steel Framing Design Manual, Thomas Sputo
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
No abstract provided.
Transverse Shear Stiffness Of Bolted Cold-Formed Steel Storage Rack Upright Frames With Channel Bracing Members, Nima Talebian, Benoit P. Gilbert, Hassan Karampour
Transverse Shear Stiffness Of Bolted Cold-Formed Steel Storage Rack Upright Frames With Channel Bracing Members, Nima Talebian, Benoit P. Gilbert, Hassan Karampour
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Accurately evaluating the transverse shear stiffness of cold-formed steel storage rack upright frames is crucial to calculate the frame elastic buckling load, perform earthquake design and serviceability checks. This is especially essential for high-bay racks, which are subjected to large second-order effects, and racks supporting the building enclosure, which are exposed to transverse wind loads. The shear behaviour of these frames is poorly understood and experimental testing is usually required to measure their stiffness. Previous studies have shown that Finite Element Analyses (FEA), solely using beam elements, fail to reproduce experimental test results and may overestimate the transverse shear stiffness …
Finite Element Modeling And Validation Of Steel Sheathed Cold-Formed Steel Framed Shear Walls, Amanpreet Singh, Tara C. Hutchinson
Finite Element Modeling And Validation Of Steel Sheathed Cold-Formed Steel Framed Shear Walls, Amanpreet Singh, Tara C. Hutchinson
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The objective of this paper is to validate the concept of utilizing a truss-element based finite element model for capturing the in-plane cyclic response of steel sheathed cold-formed steel (CFS) framed shear wall. The model is developed within the OpenSees finite element platform. Steel sheathed CFS shear walls show shear buckling of their sheathing as a tension field develops. This inelastic behavior of the shear walls is replicated by using the Pinching4 material for truss elements acting along the tension field. Importantly, the model employs beam-column elements for framing members, rotational springs for representing frame stiffness and vertical springs for …
Proposal To Improve The Dsm Design Of Cold-Formed Steel Angle Columns: Need, Background, Quality Assessment And Illustration, Pedro Borges Dinis, Dinar Camotim
Proposal To Improve The Dsm Design Of Cold-Formed Steel Angle Columns: Need, Background, Quality Assessment And Illustration, Pedro Borges Dinis, Dinar Camotim
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
This paper presents a proposal for the codification of an efficient design approach, based on the Direct Strength Method (DSM), for cold-formed steel equal-leg angle columns with short-to-intermediate lengths, i.e., those buckling in flexural-torsional modes. Initially, the available experimental failure load data, comprising fixed-ended and pin-ended (“cylindrical hinges”) columns with several geometries (cross-section dimensions and lengths) and tested by various researchers, are collected and used to show that the currently codified DSM design provisions are not able to handle adequately short-to- intermediate angle columns and that a specific DSM-based design approach is needed to estimate the failure loads of such …
Distortional Buckling Of Cold-Formed Steel Flanges Under Stress Gradient, Robert S. Glauz
Distortional Buckling Of Cold-Formed Steel Flanges Under Stress Gradient, Robert S. Glauz
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The strength of cold-formed steel beams with stiffened flanges may be controlled by distortional buckling. Buckling stress prediction methods have been developed for flanges under uniform compression. However, channel sections are commonly used where bending occurs about the minor axis with flanges under stress gradient, such that the edges are in compression and the flanges may experience distortional buckling. Current design specifications do not explicitly address this failure mode, which could lead to unsafe designs. This paper presents and verifies an analytical approach for distortional buckling stress prediction for flanges under stress gradient. The approach is consistent with the design …
The Design And Development Of Lightweight Composite Panels For Rigid Wall Structures, Jeremy J. Artman, Cheng Yu
The Design And Development Of Lightweight Composite Panels For Rigid Wall Structures, Jeremy J. Artman, Cheng Yu
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The paper presents a research effort aimed at developing a stronger, lighter, and more economic shelter for both military and civilian use. Reported herein are the research results on developing solid wall panels using cold-formed steel corrugated sheathing and members, as well as polyurethane spray foam for insulation. This research includes calculating uniform load density, determining the overall strength of the panel, and investigating the flexural strength of the roof panels. Research incorporated different connection methods, with varied stud spacing, to determine the safest design for the new mobile facilities. Previous research has shown that cold-formed steel corrugated sheathing performs …
Web Crippling Behavior Of Cold-Formed Ferritic Stainless Steel Unlipped Channels Under Interior-One-Flange And End-One-Flange Loadings, Amir M. Yousefi, James B. P. Lim, G. Charles Clifton
Web Crippling Behavior Of Cold-Formed Ferritic Stainless Steel Unlipped Channels Under Interior-One-Flange And End-One-Flange Loadings, Amir M. Yousefi, James B. P. Lim, G. Charles Clifton
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The web crippling strength of cold-formed ferritic stainless steel unlipped channels subject to interior-one-flange and end-one-flange loading is considered in this paper. A total of 144 results are presented, comprising 36 laboratory and 108 numerical results. These results cover the cases of both flanges restrained and unrestrained to the load and reaction plates. Unlike other work in the literature, the numerical analysis in this paper uses nonlinear quasi-static finite element analysis with an implicit integration scheme, which has advantages over static and quasi-static with an explicit integration scheme analyses, particularly for post buckling predictions of unlipped channels subject to web …
Experimental And Analytical Studies Of Cold-Formed Steel Sections With Edge-Stiffened Circular Holes Subjected To Web Crippling, Asraf Uzzaman, James B. P. Lim, David Nash, Amir M. Yousefi, Benjamin Young
Experimental And Analytical Studies Of Cold-Formed Steel Sections With Edge-Stiffened Circular Holes Subjected To Web Crippling, Asraf Uzzaman, James B. P. Lim, David Nash, Amir M. Yousefi, Benjamin Young
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel sections are often used as wall studs or floor joists and such sections often include web holes for ease of installation of services. The holes are normally punched or bored and are unstiffened; when the holes are near to points of concentrated load, web crippling can be the critical design consideration. Recently, a new generation of cold-formed steel channel sections with edge-stiffened circular holes has been developed. The web holes are stiffened through a continuous edge stiffener/lip around the perimeter of the hole. In this paper, a combination of experimental investigations and non-linear finite element analyses are used …
On The Effect Of Web Stiffening Of Cold-Formed Steel Thin-Walled Lipped Sigma Sections In Compression Members, Rashideddin Cheraghi, Hamidreza Mohammadzadeh
On The Effect Of Web Stiffening Of Cold-Formed Steel Thin-Walled Lipped Sigma Sections In Compression Members, Rashideddin Cheraghi, Hamidreza Mohammadzadeh
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel cross sections are high strength thin-walled profiles which are highly prone to local and distortional instabilities. Stiffening techniques are utilized in the industry as a solution to enhance local and distortional buckling strengths. The sigma section is that channel section which its web pushed inward for the stiffening reason. In this research, the effect of side sway of the web (dx) on the buckling behavior of lipped sigma sections is investigated. The results demonstrate that stiffening inclined components of the web in lipped sigma sections for dx up to 0.5512”(14 mm) act as a stiffener and change the …
The Impact Of Bearing Conditions On The Behavior Of Cold-Formed Steel Stud Assemblies, Abbas Joorabchian, Zhanjie Li, Kara D. Peterman
The Impact Of Bearing Conditions On The Behavior Of Cold-Formed Steel Stud Assemblies, Abbas Joorabchian, Zhanjie Li, Kara D. Peterman
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
The objective of this study is to explore the structural response of cold-formed steel stud assemblies (i.e., stud and track) with partial bearing conditions. It is hypothesized that studs bearing under partial bearing conditions (i.e., not fully bearing on a concrete slab) may result in reduced axial capacities. Currently, the behavior of these systems on concrete slabs due to member instabilities is not well-understood, and cold-formed steel design specifications provide no guidance. This study provides an integral experimental and numerical investigation of the stability response of the studs under partial bearing conditions in order to quantify the reduction of their …
Finite-Element Analysis Of The Eaves Joint Of Cold-Formed Steel Portal Frames Having Single Channel-Sections, Pouya Pouladi, John Ronaldson, George Charles Clifton, Jason Maxwell Ingham, Andrzej M. Wrzesien, Paul Milewski, James B. P. Lim
Finite-Element Analysis Of The Eaves Joint Of Cold-Formed Steel Portal Frames Having Single Channel-Sections, Pouya Pouladi, John Ronaldson, George Charles Clifton, Jason Maxwell Ingham, Andrzej M. Wrzesien, Paul Milewski, James B. P. Lim
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
A finite element model is described for the eaves joint of a cold-formed steel portal frame that comprises a single channel section for the column and rafters eaves connections. The members are connected to the brackets through both screws and bolts. Such a joint detail is commonly used in practice in New Zealand and Australia, where the function of the screws is to prevent slip of the joint during frame erection since the bolt holes are detailed for nominal clearance. The results of the finite element model are compared against two experimental test results. In both, the critical mode of …
Experimental Study Of Apex Connection Stiffness And Strength Of Cold-Formed Steel Double Channel Portal Frames, J. Peng, J. Bendit, H. B. Blum
Experimental Study Of Apex Connection Stiffness And Strength Of Cold-Formed Steel Double Channel Portal Frames, J. Peng, J. Bendit, H. B. Blum
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Cold-formed steel portal frames are an increasingly popular structure in the housing and industrial sectors, and are commonly used for garages, sheds, and shelters. Longer span cold-formed steel portal frames are relatively new to the market, and as a result limited design guidance and recommendations exist, including the strength and stiffness of the connections. The apex connection stiffness affects the distribution of internal actions and deflections of a portal frame, and therefore, it is necessary to quantify the apex stiffness for use in design models to accurately determine the frame behavior. An experimental program was carried out on a series …
Shear Resistance Mechanisms On Steel Sheet Shear Walls With Burring Holes And Cross-Rails, Yoshimichi Kawai, Kazunori Fujihashi, Shigeaki Tohnai, Atsushi Sato, Tetsuro Ono
Shear Resistance Mechanisms On Steel Sheet Shear Walls With Burring Holes And Cross-Rails, Yoshimichi Kawai, Kazunori Fujihashi, Shigeaki Tohnai, Atsushi Sato, Tetsuro Ono
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
Steel sheet shear walls with burring holes are employed in low and mid-rise buildings in seismically active regions. A configuration with burrs on the inside enables the thinner wall and omitting the machining of equipment holes. The effects of cross-rails which are generally designed to strengthen the bearing capacities of the studs, on 2.73~4.53m height shear walls were clarified by finite element analysis and experiments. Post-buckling behavior depends on tension fields restrained by the cross-rails. The formulas of the allowable strengths and the indexes of ultimate strengths were developed using the mechanisms.
Using Generalized Beam Theory To Assess The Behavior Of Curved Thin-Walled Members, Nuno Peres, Rodrigo Goncalves, Dinar Camotim
Using Generalized Beam Theory To Assess The Behavior Of Curved Thin-Walled Members, Nuno Peres, Rodrigo Goncalves, Dinar Camotim
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)
In this work, the first-order behavior of naturally curved thin-walled bars with circular axis, without pre-twist, is assessed with the help of the Generalized Beam Theory (GBT) formulation previously developed by the authors. With respect to the previous work, which dealt with simple cross-sections, the present paper presents a method to obtain the deformation modes for arbitrary flat-walled cross-sections. Despite the complexity involved in this generalization, the standard GBT kinematic assumptions are kept, since they are essential to (i) subdivide the modes in a meaningful way and (ii) reduce the number of DOFs necessary to obtain accurate solutions. It is …