Seismic Tests of Welded Moment Resisting Connections Made of Laser-Welded Stainless Steel Sections

2018 ◽  
Vol 763 ◽  
pp. 440-449
Author(s):  
Hafez Taheri ◽  
George Charles Clifton ◽  
Ping Sha Dong ◽  
Michail Karpenko ◽  
Gary M. Raftery ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Large Scale ◽  
Steel Structures ◽  
Steel Beams ◽  
Steel Connections ◽  
Steel Members ◽  
Moment Resisting ◽  
Steel Sections ◽  
Seismic Tests

Steel structures are well established as the preferred material for constructing seismic resisting systems in New Zealand and around the world. While the majority of steel framing is made of carbon steel, stainless steel is increasingly being considered for designing exposed steel structures. Because of significant differences in the mechanical properties between the two materials, seismic resisting system design rules for connections between carbon steel members may not be applicable, at least without modification, to connections between stainless steel members. This study has investigated the seismic performance of welded T-shaped beam-column moment resisting connections made of structural stainless steel beams and columns manufactured by laser welding. The paper included the results of three large-scale T-shaped specimens, of varying sizes, subjected to seismic loads. The grade of laser-fused stainless steel was 304 L and its specification was according to ASTM A276. The sections were subject to the seismic tests in accordance with the SAC protocol given in ANSI/AISC 341-10. The results shows substantial amount of energy dissipation by welded moment resisting stainless steel connections along with a high ductility capability and dependable behaviour in the inelastic range.

scholarly journals Review on Cold-Formed Steel Connections

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yeong Huei Lee ◽  
Cher Siang Tan ◽  
Shahrin Mohammad ◽  
Mahmood Md Tahir ◽  
Poi Ngian Shek
Keyword(s):  
Structural Characteristics ◽  
Steel Structures ◽  
Rolled Steel ◽  
Steel Connections ◽  
Steel Framing ◽  
Steel Sections ◽  
Cold Formed Steel ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Review Current

The concept of cold-formed light steel framing construction has been widespread after understanding its structural characteristics with massive research works over the years. Connection serves as one of the important elements for light steel framing in order to achieve its structural stability. Compared to hot-rolled steel sections, cold-formed steel connections perform dissimilarity due to the thin-walled behaviour. This paper aims to review current researches on cold-formed steel connections, particularly for screw connections, storage rack connections, welded connections, and bolted connections. The performance of these connections in the design of cold-formed steel structures is discussed.

scholarly journals Semi-continous beam-to-column joints for slim-floor systems in seismic zones

2018 ◽  
Author(s):  
Adrian Ciutina ◽  
Cristian Vulcu ◽  
Rafaela Don
Keyword(s):  
Finite Element ◽  
Concrete Slab ◽  
Bending Moment ◽  
Steel Structures ◽  
Bending Test ◽  
Steel Beams ◽  
Element Analysis ◽  
Natural Fire ◽  
Floor Systems ◽  
Moment Resisting

The slim-floor building system is attractive to constructors and architects due to the integration of steel beam in the overall height of the floor, which leads to additional floor-to-floor space, used mostly in acquiring additional storeys. The concrete slab offers natural fire protection for steel beams, while the use of novel corrugated steel sheeting reduces the concrete volume, and replaces the secondary beams (for usual spans of steel structures). Currently the slim-floor solutions are applied in non-seismic regions, and there are few studies that consider continuous or semi-continuous fixing of slim-floor beams. The present study was performed with the aim to develop reliable end-plate bolted connections for slim-floor beams, capable of being applicable to buildings located in areas with seismic hazard. It is based on numerical finite element analysis, developed in two stages. In a first stage, a finite element numerical model was calibrated based on a four point bending test of a slim-floor beam. Further, a case study was analysed for the investigation of beam-to-column joints with moment resisting connections between slim-floor beams and columns. The response was investigated considering both sagging and hogging bending moment. The results are analysed in terms of moment-rotation curve characteristics and failure mechanism. 

Experimental and numerical study of CFRP reinforced steel beams

2020 ◽  
pp. 147509022096026
Author(s):  
Minos E Kypriadis ◽  
Elias P Bilalis ◽  
Nicholas G Tsouvalis
Keyword(s):  
Large Scale ◽  
Numerical Study ◽  
Load Capacity ◽  
Steel Structures ◽  
High Strength ◽  
Maximum Load ◽  
Steel Beams ◽  
High Fatigue ◽  
Reinforced Steel ◽  
Large Scale Tests

The use of composite materials patches for the reinforcement of steel structures attracts particular interest. Due to their high strength, light weight, and high fatigue and corrosion resistance, composite patches represent a versatile reinforcement solution. In this paper, the reinforcement of steel beams with CFRP patches is examined. Large scale tests of “H” and “square hollow” cross section steel beams are conducted. The beams are reinforced with CFRP patches, investigating the effect of the thickness and the length of the patch, and the type of the cohesive joint. All reinforced specimens showed increase of their stiffness and their maximum load capacity. Furthermore, advanced finite element models are developed for the simulation of the mechanical behavior of the reinforced steel beams. FE results relate very well to the experimental ones for most of the measured magnitudes, thus verifying the reliability of the developed models in estimating stiffness, yield load and maximum load capacity of the beams.

Structural Fire Performance of Innovative Moment-Resisting Connection Joining Steel Beams to HSS Columns

2014 ◽  
Vol 5 (4) ◽  
pp. 331-352
Author(s):  
Osama Salem ◽  
George Hadjisophocleous ◽  
Ehab Zalok
Keyword(s):  
Large Scale ◽  
Plate Thickness ◽  
Steel Beams ◽  
Fire Performance ◽  
Structural Fire ◽  
End Plate ◽  
Moment Connection ◽  
Moment Resisting ◽  
Regular Configuration ◽  
Extended End Plate

In this paper, experimental results of the structural fire behaviour of four large-scale steel frame test assemblies are presented. Test assemblies were made of HSS beams and columns connected together using an innovative extended end-plate moment connection configuration. Two different parameters were investigated, the connection end plate thickness and the degree of beam axial restraint. The fire performance of this beam-to-column configuration was compared to the behaviour of a commonly-used connection configuration with similar parameters and fire testing conditions. The newly-developed connection configuration behaved in a more flexible manner at elevated temperature than the regular configuration. In addition to improved constructability and pleasant appearance, the new connection configuration exhibits greater moment-carrying capacity and enhanced fire resistance characteristics.

scholarly journals Creep-free fire analysis of steel structures with Eurocode 3 material model

2016 ◽  
Vol 7 (3) ◽  
pp. 234-248 ◽  
Author(s):  
Neno Toric ◽  
Rui Rui Sun ◽  
Ian W. Burgess
Keyword(s):  
Steel Structures ◽  
Material Model ◽  
Steel Beams ◽  
Heating Rates ◽  
Content Type ◽  
Simply Supported ◽  
Fire Engineering ◽  
Steel Members ◽  
Steel Material ◽  
Eurocode 3

Purpose This paper aims to propose a methodology to remove inherent implicit creep from the Eurocode 3 material model for steel and to present a creep-free analysis on simply supported steel members. Design/methodology/approach Most of the available material models of steel are based on transient coupon tests, which inherently include creep strain associated with particular heating rates and load ratios. Findings The creep-free analysis aims to reveal the influence of implicit creep by investigating the behaviour of simply supported steel beams and columns exposed to various heating regimes. The paper further evaluates the implicit consideration of creep in the Eurocode 3 steel material model. Originality/value A modified Eurocode 3 carbon steel material model for creep-free analysis is proposed for general structural fire engineering analysis.

Camber In Electron-Beam Welded Stainless Steel Sections

1976 ◽  
Vol 4 (2) ◽  
pp. 97-100
Author(s):  
M. J. Bibby ◽  
J. A Goldak
Keyword(s):  
Stainless Steel ◽  
Electron Beam ◽  
Carbon Steel ◽  
Mild Steel ◽  
Heat Input ◽  
Steel Alloys ◽  
Section Size ◽  
Steel Sections ◽  
Semi Empirical

Camber measurements in a series of small electron-beam (EB) welded stainless-steel Tee and bar sections are presented. The results are rationalized in terms of the semi-empirical deflection relationship for predicting camber in welded mild steel sections. It is demonstrated that the same relationship can be used for both austenitic stainless and carbon steel alloys. Some of the limits of camber predictability in terms of section size and heat input are discussed.

scholarly journals Performance of axially restrained carbon and stainless steel perforated beams at elevated temperatures

2021 ◽  
pp. 136943322110339
Author(s):  
Mohamed A Shaheen ◽  
Sheida Afshan ◽  
Andrew SJ Foster
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Austenitic Stainless Steel ◽  
Elevated Temperatures ◽  
Compressive Force ◽  
Load Ratio ◽  
Experimental Tests ◽  
Steel Beams ◽  
Web Openings ◽  
Steel Composite

This article compares the fire performance of axially restrained perforated carbon and austenitic stainless steel composite beams with circular and rectangular web openings. Finite element models, validated against experimental tests from the literature, were used to perform parametric analysis. The beams were analysed under various levels of load ratio and axial restraint stiffness covering the ranges which may exist in practice. It is concluded that austenitic stainless steel perforated beams show a more ductile fire response compared to carbon steel beams of similar geometry. It is shown that despite stainless steel’s higher thermal expansion, the beams exhibit lower thermal-induced peak compressive forces than carbon steel beams giving rise to lower levels of thermal-induced compressive force on the adjacent cold structures. The load ratio was found to determine the relative survivability of stainless steel and carbon steel beams, where at load ratios lower than 0.6, stainless steel beams show superior fire resistance than their carbon steel counterparts. The article also assesses the applicability and accuracy of the Steel Construction Institute method for the design of carbon and stainless steel perforated beams, and recommendations for future improvements are made.

scholarly journals PARAMETRIC STUDY ON THE LATERAL TORSIONAL BUCKLING OF STAINLESS STEEL I BEAMS WITH CLASS 4 CROSS-SECTIONS IN CASE OF FIRE

2016 ◽  
Author(s):  
Nuno Lopes ◽  
Pedro Gamelas ◽  
Paulo Vila Real
Keyword(s):  
Stainless Steel ◽  
Cross Sections ◽  
Elevated Temperatures ◽  
Numerical Study ◽  
Design Guidelines ◽  
Steel Grade ◽  
Steel Beams ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Steel Members

For predicting the behaviour of beams with thin-walled I sections, named Class 4 in Eurocode 3 (EC3), it is necessary to account for the occurrence of both local and lateral torsional buckling (LTB). These instability phenomena, which are intensified at elevated temperatures, should be accurately considered in design rules. The fire design guidelines for stainless steel members, given in Part 1-2 of EC3, propose the use of the same formulae developed for carbon steel (CS) elements. However, these two materials have different constitutive laws, leading to believe that the use of those formulae should be validated. This work presents a parametric numerical study on the behaviour of stainless steel beams with Class 4 I sections at elevated temperatures. The influences of several parameters such as stainless steel grade, loading type and cross section slenderness are evaluated, and comparisons between the obtained numerical results and EC3 rules are presented.

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