scholarly journals EC3-Compatible Methods for Analysis and Design of Steel Framed Structures

Modelling ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 567-590
Author(s):  
Sofia Antonodimitraki ◽  
Pavlos Thanopoulos ◽  
Ioannis Vayas
Keyword(s):  
Cross Section ◽  
Steel Frames ◽  
Steel Structures ◽  
Ultimate Capacity ◽  
Framed Structures ◽  
Analysis And Design ◽  
Order Analysis ◽  
Advantages And Disadvantages ◽  
Moment Resisting ◽  
Safe Side

The behaviour of steel structures is affected by two nonlinearities—the geometric and material nonlinearity—and by the unavoidable presence of imperfections. To evaluate the ultimate capacity of a structure, these effects should be taken into consideration during the design process, either explicitly in the analysis or implicitly through the verification checks. In this context, Eurocode 3 provides several design approaches of different complexity and accuracy. The advantages and disadvantages of these approaches are discussed. Five different methods in conformity with the Eurocode provisions are applied for the design of four moment resisting steel frames of varying slenderness. The influence of nonlinearities and imperfections in respect to the slenderness of the structure is illustrated. The examined methods are compared in terms of the predicted ultimate capacity and their efficiency is assessed against the most accurate between them, i.e., an advanced geometrically and materially nonlinear analysis. It is shown that considerable differences arise between the methods. Nevertheless, except for the commonly used 2nd order analysis followed by cross-section verifications, the remaining methods are mostly on the safe side.

Behaviour of steel frames under fire conditions

1999 ◽  
Vol 26 (2) ◽  
pp. 156-167 ◽  
Author(s):  
D I Nwosu ◽  
VKR Kodur
Keyword(s):  
Fire Resistance ◽  
Steel Frames ◽  
Load Ratio ◽  
Steel Structures ◽  
Point Of View ◽  
Frame Structures ◽  
Structural Behaviour ◽  
Analysis And Design ◽  
In Fire ◽  
Fire Conditions

A state-of-the-art review of the behaviour of steel frame structures in fire is presented. Results from different studies indicate that the behaviour of a complete structure is different from that of a single structural member under fire conditions from the point of view of fire resistance. Earlier studies also show that analysis and design of steel structures against fire based on their overall behaviour could lead to a reduction or the elimination of applied fire protection to certain structural members. The effects of continuity, restraint conditions, and load ratio on the fire resistance of frame structures are discussed. The beneficial aspects derived from considering overall structural rather than single-member behaviour in fire are illustrated through the analysis on two one-bay, one-storey, unprotected steel portal frames, a column, and a beam. Also comparison is made between the performance of a beam with different end restraints in fire. Results from the analyses indicate that the fire resistance of a member is increased when it is considered as part of a structure compared with when it is considered as a single member.Key words: steel, frames, fire resistance, buckling, loads, overall structural behaviour.

Seismic design of steel buildings: lessons from the 1995 Hyogo-ken Nanbu earthquake

1996 ◽  
Vol 23 (3) ◽  
pp. 727-756 ◽  
Author(s):  
Robert Tremblay ◽  
Andre Filiatrault ◽  
Michel Bruneau ◽  
Masayoshi Nakashima ◽  
Helmut G. L. Prion ◽  
...  
Keyword(s):  
Seismic Design ◽  
Steel Structures ◽  
Structural Systems ◽  
Braced Frames ◽  
Steel Buildings ◽  
Concentrically Braced Frames ◽  
Framed Structures ◽  
Concentrically Braced ◽  
Moment Resisting ◽  
Column Bases

Past and current seismic design provisions for steel structures in Japan are presented and compared with Canadian requirements. The performance of steel framed structures during the January 17, 1995, Hyogo-ken Nanbu earthquake is described. Numerous failures and examples of inadequate behaviour could be observed in buildings of various ages, sizes, and heights, and braced with different structural systems. In moment resisting frames, the damage included failures of beams, columns, beam-to-column connections, and column bases. Fracture of bracing members or their connections was found in concentrically braced frames. The adequacy of the current Canadian seismic design provisions is examined in view of the observations made. Key words: earthquake, seismic design, steel structures.

scholarly journals Cold-formed Steel Framing of a Dairy Products Warehouse in Brest, Belarus

2021 ◽  
Vol 350 ◽  
pp. 00014
Author(s):  
Vasili Stsepaniuk ◽  
Andrei Shuryn ◽  
Dmitry Zhdanov ◽  
Pavel Tsikhanchuk
Keyword(s):  
Structural Design ◽  
Dairy Products ◽  
Structural Features ◽  
Basic Principles ◽  
Framed Structures ◽  
Analysis And Design ◽  
Advantages And Disadvantages ◽  
Steel Framing ◽  
Cold Formed Steel

The main advantages and disadvantages of cold-formed steel framed structures are discussed, and the basic principles for their analysis and design are considered. Some specific structural features of the thinwalled cold-formed steel framing of a dairy warehouse designed by Proektnauka LLC (Brest, RB), are described, and several recommendations so as to improve its structural design are given.

scholarly journals Experimental Testing of Innovative Cold-Formed "GEB" Section / Badania Eksperymentalne Innowacyjnego Kształtownika Giętego Na Zimno Typu „Geb“

2015 ◽  
Vol 16 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Agnieszka Łukowicz ◽  
Elżbieta Urbańska-Galewska ◽  
Małgorzata Gordziej-Zagórowska
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Experimental Testing ◽  
Steel Frames ◽  
Steel Structures ◽  
Limit Load ◽  
Bending Tests ◽  
Low Weight ◽  
Steel Sections ◽  
Cold Formed Steel

Abstract One of the major advantages of light gauge steel structures made of cold-formed steel sections is their low weight so the production of typical single-storey steel structures of this kind of profiles is still rising. The well known profiles, e.o. Z-sections, C-sections and the so called hat-sections studied and described in the literature, are used mainly as purlins or truss components. A new profile GEB was patented for the use for primary load-bearing member in fabricated steel frames. According to the code [1] every novel cross section should be tested to assign the deformation shape and bearing capacity. The paper deals with the numerical and experimental research of bearing capacity of cold formed GEB profiles. The deformation shape and limit load was obtained from bending tests. The GEB cross section bearing capacity was also determined according to codes [1, 2].

scholarly journals Performance of steel structures during the 1994 Northridge earthquake

1995 ◽  
Vol 22 (2) ◽  
pp. 338-360 ◽  
Author(s):  
Robert Tremblay ◽  
André Filiatrault ◽  
Peter Timler ◽  
Michel Bruneau
Keyword(s):  
Current Knowledge ◽  
Steel Frames ◽  
Steel Structures ◽  
Northridge Earthquake ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Load Paths ◽  
Concentrically Braced ◽  
Moment Resisting ◽  
Observed Damage

The performance of concentrically braced steel frames and moment resisting steel frames during the January 17, 1994, Northridge, California, earthquake is examined. Most of the observations made during the reconnaissance visits confirmed the current knowledge on the inelastic response of these structural systems. This permits the anticipation of proper seismic behavior for buildings designed according to the seismic provisions that have been recently introduced in the Canadian building code and standard for steel structures. In some cases, however, the observed damage raised concerns that should be addressed in future investigations or next editions of these codes. Preventing potentially hazardous nonstructural damage, avoiding premature nonductile failures anywhere along the lateral load paths, limiting structural and nonstructural damage due to brace buckling, and accounting for the vertical ground motion are among those issues. Key words: earthquake, seismic, steel, concentrically braced frames, moment resisting frames, weld.

scholarly journals On California Structural Steel Seismic Design

1986 ◽  
Vol 2 (4) ◽  
pp. 703-727 ◽  
Author(s):  
Egor P. Popov
Keyword(s):  
Structural Steel ◽  
Seismic Design ◽  
Steel Frames ◽  
Steel Structures ◽  
Concentrically Braced Frames ◽  
Concentrically Braced ◽  
Moment Resisting ◽  
The Usa ◽  
Major Attention ◽  
Eccentric Bracing

A number of new code developments, largely initiated in California, are taking place in the USA for the seismic design of steel structures. The principal ones are reviewed and commented upon in the paper. Key experimental support for some of the changes is indicated. Major attention is directed to the three main types of steel construction: moment-resisting frames, concentrically braced steel frames, and, the relatively new method for seismic design, eccentric bracing. Some of the proposed and possible practical improvements in moment-resisting connections are given; the reasons for some concern over the use of concentrically braced frames for severe seismic applications are discussed; and a brief overview on the application of eccentrically braced steel frames is presented. The paper concludes with a few remarks on future trends and needs in structural steel seismic design.

Second-Order Analysis and Design of Wall-Framed Structures Allowing for Imperfections

2010 ◽  
Vol 13 (3) ◽  
pp. 513-524 ◽  
Author(s):  
Y.P. Liu ◽  
S.L. Chan ◽  
Z.H. Zhou ◽  
D. So ◽  
R. Yu
Keyword(s):  
Second Order ◽  
Framed Structures ◽  
Analysis And Design ◽  
Order Analysis

scholarly journals Improving the Structural Reliability of Steel Frames Using Posttensioned Connections

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Edén Bojórquez ◽  
Arturo López-Barraza ◽  
Alfredo Reyes-Salazar ◽  
Sonia E. Ruiz ◽  
Jorge Ruiz-García ◽  
...  
Keyword(s):  
Ground Motion ◽  
Structural Reliability ◽  
Narrow Band ◽  
Steel Frames ◽  
Steel Structures ◽  
Incremental Dynamic Analysis ◽  
Spectral Acceleration ◽  
Residual Drift ◽  
Interstory Drift ◽  
Moment Resisting

In this paper, various moment-resisting steel frames (MRSFs) are subjected to 30 narrow-band motions scaled at different ground motion intensity levels in terms of spectral acceleration at first mode of vibration SaT1 in order to perform incremental dynamic analysis for peak and residual interstory drift demands. The results are used to compute the structural reliability of the steel frames by means of hazard curves for peak and residual drifts. It is observed that the structures exceed the threshold residual drift of 0.5%, which is perceptible to human occupants, and it could lead to human discomfort according to recent investigations. For this reason, posttensioned connections (PTCs) are incorporated into the steel frames in order to improve the structural reliability. The results suggest that the annual rate of exceedance of peak and residual interstory drift demands are reduced with the use of PTC. Thus, the structural reliability of the steel frames with PTC is superior to that of the MRSFs. In particular, the residual drift demands tend to be smaller when PTCs are incorporated in the steel structures.

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