scholarly journals Initial rotational stiffness of tubular joints with axial force in chord

2017 ◽  
Vol 50 (3) ◽  
pp. 309-312
Author(s):  
Marsel Garifullin ◽  
Sami Pajunen ◽  
Kristo Mela ◽  
Markku Heinisuo
Keyword(s):  
Axial Force ◽  
Numerical Study ◽  
Global Analysis ◽  
Frame Analysis ◽  
Current Approach ◽  
Axial Loads ◽  
Rotational Stiffness ◽  
Initial Stiffness ◽  
T Joints ◽  
Hollow Section

In the frame analysis, the local model of the joint must follow the behavior of the joint. When completing the elastic global analysis, the initial rotational stiffness of joints should be known to obtain reliable moment distributions in frames. This paper consists of two parts. The first one evaluates the existing calculation approach for the initial rotational stiffness of welded rectangular hollow section T joints. The validation with the experimental data shows that the current approach significantly underestimates the initial rotational stiffness. An improvement for determining the initial stiffness of T joints is proposed. The second part deals with the influence of the axial force in the main member on the rotational stiffness of the joint. The conducted numerical study shows the extreme reduction of the initial stiffness, when the main member is loaded by axial loads. To consider this effect in the frame analysis, the paper proposes a chord stress function for the initial rotational stiffness for square hollow section T joints, using the curve fitting technique.

scholarly journals Design and analysis of concrete-filled tubular flange girders under combined loading

2021 ◽  
pp. 136943322110015
Author(s):  
Rana Al-Dujele ◽  
Katherine Ann Cashell
Keyword(s):  
Finite Element ◽  
Axial Force ◽  
Failure Modes ◽  
Numerical Study ◽  
Combined Loading ◽  
Torsional Stiffness ◽  
Fe Model ◽  
Combined Effects ◽  
Element Analysis ◽  
Hollow Section

This paper is concerned with the behaviour of concrete-filled tubular flange girders (CFTFGs) under the combination of bending and tensile axial force. CFTFG is a relatively new structural solution comprising a steel beam in which the compression flange plate is replaced with a concrete-filled hollow section to create an efficient and effective load-carrying solution. These members have very high torsional stiffness and lateral torsional buckling strength in comparison with conventional steel I-girders of similar depth, width and steel weight and are there-fore capable of carrying very heavy loads over long spans. Current design codes do not explicitly include guidance for the design of these members, which are asymmetric in nature under the combined effects of tension and bending. The current paper presents a numerical study into the behaviour of CFTFGs under the combined effects of positive bending and axial tension. The study includes different loading combinations and the associated failure modes are identified and discussed. To facilitate this study, a finite element (FE) model is developed using the ABAQUS software which is capable of capturing both the geometric and material nonlinearities of the behaviour. Based on the results of finite element analysis, the moment–axial force interaction relationship is presented and a simplified equation is proposed for the design of CFTFGs under combined bending and tensile axial force.

Static Strength of Cracked Square Hollow Section T Joints under Axial Loads. II: Numerical

2006 ◽  
Vol 132 (3) ◽  
pp. 378-386 ◽  
Author(s):  
Seng-Tjhen Lie ◽  
Chi-King Lee ◽  
Sing-Ping Chiew ◽  
Zheng-Mao Yang
Keyword(s):  
Static Strength ◽  
Axial Loads ◽  
T Joints ◽  
Hollow Section

Analysis of rectangular hollow section trusses

2019 ◽  
Vol 46 (3) ◽  
pp. 160-175 ◽  
Author(s):  
Kyle Tousignant ◽  
Jeffrey A. Packer
Keyword(s):  
Axial Force ◽  
Frame Analysis ◽  
Bending Moment ◽  
Bending Moments ◽  
Hollow Section ◽  
Simply Supported ◽  
Axial Forces ◽  
Detailed Method ◽  
Elastic Loading ◽  
Analysis Models

A database of 26 previous full-scale experiments on rectangular hollow section (RHS) trusses is supplemented by nine tests on a 10-metre-span, simply supported, RHS Warren truss, reported herein. Measured axial forces, bending moments and truss deflections are compared to four 2D, elastic, frame-analysis models consisting of: (i) all joints pinned and concentric; (ii) all joints rigid and concentric; (iii) pin-ended webs connected eccentrically to continuous chords; and (iv) rigid-ended webs connected eccentrically to continuous chords. On average, all four models predict sufficiently accurate axial force distributions and deflections under elastic loading. However, all four models under-predict bending moment magnitudes. Implications for RHS truss analysis according to the “detailed method” of CSA S16-14 are discussed, and recommendations for modelling are made.

Initial in-plane rotational stiffness of welded RHS T joints with axial force in main member

2017 ◽  
Vol 139 ◽  
pp. 353-362 ◽  
Author(s):  
Marsel Garifullin ◽  
Sami Pajunen ◽  
Kristo Mela ◽  
Markku Heinisuo ◽  
Jarmo Havula
Keyword(s):  
Axial Force ◽  
Rotational Stiffness ◽  
T Joints

Static Strength of Cracked Square Hollow Section T Joints under Axial Loads. I: Experimental

2006 ◽  
Vol 132 (3) ◽  
pp. 368-377 ◽  
Author(s):  
Seng-Tjhen Lie ◽  
Sing-Ping Chiew ◽  
Chi-King Lee ◽  
Zheng-Mao Yang
Keyword(s):  
Static Strength ◽  
Axial Loads ◽  
T Joints ◽  
Hollow Section

scholarly journals Finite element model for rectangular hollow section T joints

2018 ◽  
Vol 51 (3) ◽  
pp. 15-40
Author(s):  
Marsel Garifullin ◽  
Sami Pajunen ◽  
Kristo Mela ◽  
Markku Heinisuo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Bending Moment ◽  
High Strength ◽  
Experimental Tests ◽  
Element Model ◽  
Fe Model ◽  
Initial Stiffness ◽  
T Joints ◽  
Hollow Section

Major developments in hardware and software enable researchers and engineers to apply non-linear finite-element analyses to study the behavior of tubular structures. However, to provide reasonable results, constructed finite element models should be verified and validated with experimental data. This article develops a finite element model for high strength steel rectangular hollow section T joints. The joints are considered under in-plane bending moment and axial brace loading. The paper determines the most suitable finite elements and the number of layers in the thickness direction for the numerical assessment of initial stiffness and modeling the whole action-deformation behavior of joints. Finally, the proposed FE model is validated with the series of experimental tests. The validation shows that the developed model properly captures the local behavior of tubular joints and can efficiently serve as a reliable tool in routine numerical analyses.

Experimental, numerical and parametric studies on stress concentration factors of T-joints under tension

2021 ◽  
pp. 136943322110499
Author(s):  
Feleb Matti ◽  
Fidelis Mashiri
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Numerical Study ◽  
Hot Spot ◽  
Joint Models ◽  
Element Analysis ◽  
T Joints ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Good Agreement

This paper investigates the behaviour of square hollow section (SHS) T-joints under static axial tension for the determination of stress concentration factors (SCFs) at the hot spot locations. Five empty and corresponding concrete-filled SHS-SHS T-joint connections were tested experimentally and numerically. The experimental investigation was carried out by attaching strain gauges onto the SHS-SHS T-joint specimens. The numerical study was then conducted by developing three-dimensional finite element (FE) T-joint models using ABAQUS finite element analysis software for capturing the distribution of the SCFs at the hot spot locations. The results showed that there is a good agreement between the experimental and numerical SCFs. A series of formulae for the prediction of SCF in concrete-filled SHS T-joints under tension were proposed, and good agreement was achieved between the maximum SCFs in SHS T-joints calculated from FE T-joint models and those from the predicted formulae.

Crack surface under weld toe in square hollow section T-joints

2017 ◽  
pp. 621-628
Author(s):  
S.P. Chiew ◽  
S. T. Lie ◽  
C.K. Lee ◽  
H.L. Ji
Keyword(s):  
Crack Surface ◽  
T Joints ◽  
Hollow Section ◽  
Weld Toe

Compressive strength of square hollow section T-joints reinforced with novel collar-plate

2017 ◽  
pp. 295-301
Author(s):  
H.F. Chang ◽  
J.W. Xia ◽  
G.H. Tian ◽  
Y.L. Qian ◽  
W. Xu
Keyword(s):  
Compressive Strength ◽  
T Joints ◽  
Hollow Section

Design recommendations for axially loaded elliptical hollow section X and T joints

2014 ◽  
Vol 7 (2) ◽  
pp. 89-96 ◽  
Author(s):  
Jaap Wardenier ◽  
Yoo Sang Choo ◽  
Jeffrey A. Packer ◽  
Gerhardus J. van der Vegte ◽  
Wei Shen
Keyword(s):  
T Joints ◽  
Design Recommendations ◽  
Hollow Section ◽  
Axially Loaded
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