Plate reinforced square hollow section T-joints of unequal width

1982 ◽  
Vol 9 (2) ◽  
pp. 143-148 ◽  
Author(s):  
R. M. Korol ◽  
H. Mitri ◽  
F. A. Mirza
Keyword(s):  
Carrying Capacity ◽  
Failure Modes ◽  
Bending Moment ◽  
Punching Shear ◽  
T Joints ◽  
Hollow Section ◽  
Yield Line ◽  
Plate Length ◽  
Ultimate Moment ◽  
Hollow Structural Section

The carrying capacity of square hollow structural section T-joints stiffened by a rectangular flange plate is investigated for both branch bending moment and punching shear. The ultimate moment or load is determined from the simple yield line method of which one of three failure modes is applicable depending on the plate length. A large number of combinations of branch, chord, and plate sizes are analysed to provide a statistical basis for making recommendations of optimum plate lengths and thicknesses for stiffened joints in Vierendeel truss applications.

Behavior of branch-rotated T joints with cold-formed square hollow sections

2006 ◽  
Vol 33 (7) ◽  
pp. 827-836 ◽  
Author(s):  
Kyu-Woong Bae ◽  
Keum-Sung Park ◽  
Young-Hwan Choi ◽  
Tae-Sup Moon ◽  
S F Stiemer
Keyword(s):  
Ultimate Strength ◽  
Failure Modes ◽  
Longitudinal Axis ◽  
Linear Interpolation ◽  
T Joints ◽  
Yield Line ◽  
Experimental Parameters ◽  
Out Of Plane ◽  
Web Buckling ◽  
Hollow Structural Section

An experimental investigation of branch-rotated T joints was carried out in which the branch was rotated by 45° with respect to its longitudinal axis. The main experimental parameters were the ratio of the width of the branch to the width of the chord, β′, with 0.38 ≤ β′ ≤ 1.00, and the ratio of the width of the chord to the thickness of the chord, 2γ, with 16.7 ≤ 2γ ≤ 33.3. Experimental results from 27 specimens showed that the ultimate strength increases and the failure mode changes under compression loading due to the rotated branch. The failure modes were out-of-plane bending yielding of the upper flange of the chord for β′ ≤ 0.85 and buckling of the chord web for 0.85 < β′ ≤ 1.00. Theoretical analysis was then carried out to compute the ultimate strength using a yield-line model for β′ ≤ 0.85 and web buckling model for β′ =  1.00. Linear interpolation was used for 0.85 < β′ < 1.00. Design formulas are presented for estimating the strength of T joints with a rotated branch.Key words: hollow structural section, truss T joint connections, yield-line instability, chord web instability, design equations.

scholarly journals Experimental moment resistance of rectangular hollow section T joints

2018 ◽  
Vol 245 ◽  
pp. 08003
Author(s):  
Marsel Garifullin
Keyword(s):  
Bending Moment ◽  
Main Property ◽  
Deformation Curve ◽  
T Joints ◽  
Hollow Section ◽  
Labour Intensity ◽  
Single Opinion ◽  
The Difference ◽  
Ultimate Resistance

Resistance is the main property of tubular joints. The determination of the joint resistance from the experimental load-deformation curve always represents a challenging task. Currently there are two main methods to find the experimental resistance, which are called plastic and ultimate resistance. However, there is no single opinion on which one should be commonly used. Based on the experimental results, this paper directly compares the two existed approaches. The study is restricted to welded square hollow section T joints under in-plane bending moment. The paper considers only the joints with β < 0.85, i.e. when the behaviour of the joint is governed by chord face failure. The results show that plastic resistance leads to more conservative results than ultimate resistance, providing thus safer results. However, attention should be also paid to the difference between the labour intensity of the presented methods.

scholarly journals Punching Shear Mechanism Based Design of Concrete-Filled CHS T-Joints under In-Plane Bending

2018 ◽  
Author(s):  
Fei Xu ◽  
Tak-Ming Chan ◽  
Ju Chen
Keyword(s):  
Failure Mode ◽  
Large Scale ◽  
Tube Wall ◽  
Fracture Initiation ◽  
Punching Shear ◽  
Composite Joints ◽  
T Joints ◽  
Moment Capacity ◽  
Hollow Section ◽  
Plane Bending

The in-plane bending behaviour of concrete-filled circular hollow section (CHS) T-joints was examined in this paper. The main failure mode, the punching shear of the chord-wall, was observed from the test of four large-scale joints with the diameter ratio of brace to chord (β) ranging from 0.44 to 0.85. The tube-wall deformation was measured to assess the governing failure mode of the composite joints. Complementary finite element (FE) methodology was verified against the experimental findings and the validated FE models were used to further investigate the mechanical behaviour and the design methodology. The feasibility to apply a fracture criterion in the material-level to a large-scale structural simulation was evaluated. The validated FE modes could successfully capture the tube-wall fracture initiation and propagation. Based on both experimental and numerical investigations, it was shown that the capacity of composite joints was governed by the ultimate strength limit, i.e. punching shear strength, due to the infill concrete that mitigated both inward and outward deformation on the compressive and tensile sides, respectively. The analytical model was established to reveal the composite actions between the tube and the inner concrete, and to elaborate the development of the flexural section-resistance. Finally, the design equation was proposed and could well predict the moment capacity. 

Dynamic Mechanical Behavior of Aluminum Alloy Mortise-and-Tenon T-Joints

2018 ◽  
Vol 777 ◽  
pp. 533-537
Author(s):  
Hui Yuan Xiong ◽  
Zhi Peng Luo
Keyword(s):  
Experimental Investigation ◽  
Aluminum Alloy ◽  
Failure Modes ◽  
Bending Moment ◽  
Restoring Force ◽  
T Joints ◽  
Failure Characteristics ◽  
Dynamic Mechanical Behavior ◽  
Rigid Connection ◽  
Mortise And Tenon

An experimental investigation was conducted on aluminum alloy mortise-and-tenon T-joints (MT-joints) under dynamic cyclic loading. The MT-joints strengths, stiffness, failure characteristics, hysteresis curves, skeleton curves, restoring force models and energy dissipation curves of the joints have been reported. It’s shown from the experiment that main failure modes of the MT-joints are plastic deformation of squeezing area and tenon divorced from joint. And MT-joints structure is a typical semi-rigid connection that can withstand both rotation and bending moment.

Branch plate to reinforced HSS connections in tension and compression

1993 ◽  
Vol 20 (4) ◽  
pp. 631-641 ◽  
Author(s):  
J. L. Dawe ◽  
S. J. Guravich
Keyword(s):  
Punching Shear ◽  
Width Ratio ◽  
Hollow Section ◽  
Tension And Compression ◽  
Plate Connections ◽  
Joint Behaviour ◽  
Hollow Structural Section ◽  
Hollow Structural Sections ◽  
Key Words Hollow ◽  
Plate Width

The tension and compression zones of moment plate connections were studied separately by testing branch plate and hollow structural section connections under each type of loading. Square hollow section flanges were reinforced by doubler plates fillet-welded all around. The results from 13 specimens tested in tension indicate that branch plate to reinforcing plate width ratio is an important parameter in joint behaviour. The dominant failure mode was punching shear of the reinforcing plate. The importance of reinforcing plate and HSS wall thicknesses was apparent from the results of 13 specimens tested in the compression series. The capacities of specimens in all but one test in this series were limited by failure of the HSS webs. Key words: hollow structural sections, W-shape, columns, beams, connections, experimental, design, steel.

Predicting the strength of branch plate – RHS connections for punching shear

1982 ◽  
Vol 9 (3) ◽  
pp. 458-467 ◽  
Author(s):  
Gwynne Davies ◽  
Jeffrey A. Packer
Keyword(s):  
Tube Wall ◽  
Steel Plates ◽  
Punching Shear ◽  
Width Ratio ◽  
Test Results ◽  
Early Failure ◽  
Hollow Section ◽  
Yield Line ◽  
Steel Sections ◽  
Line Analysis

The stress distribution in steel plates welded at right angles to either I-section or rectangular hollow section members is notoriously nonuniform, leading to early failure of the plate, tube wall, or weld. The paper proposes an upper-bound approach that combines lócal punching shear with normal yield line analysis. The resulting expression for strength and branch efficiency is seen to be sensitive to the value of tube wall slenderness, and in reasonable agreement with a previously obtained efficiency expression based on a lower bound to test results. The theory also confirms the experimental observation that the width ratio between the plate and the rectangular hollow section does not have a significant effect on the efficiency of the connection. The theory presented enables a parametric study of the joint strength and efficiency to be made, and thus leads to a greater understanding of the behaviour of joints to hollow steel sections.

Static Strength of Concrete-Filled Circle Tubular (CFCT) T-Joints under Axial Loading

2010 ◽  
Vol 163-167 ◽  
pp. 854-857
Author(s):  
Sheng Zhi Song ◽  
Yong Bo Shao
Keyword(s):  
Axial Compression ◽  
Failure Modes ◽  
Axial Loading ◽  
Axial Direction ◽  
Static Strength ◽  
The Finite Element Method ◽  
Joint Models ◽  
T Joints ◽  
Hollow Section ◽  
Weld Toe

For typical tubular T-joint, the common failure generally occurs near the weld toe on the chord surface due to the fact that the stiffness of the chord in radial direction is much smaller than that of the brace in axial direction. In this paper, the static strength of tubular T-joints is improved by filling concrete into the chord. The finite element method is used to investigate the improving effeciency of the static strength for tubular T-joints with filling concrete in the chord under axial compression and tension. Firstly, 6 T-joint models were analyzed to prove that filling concrete in the chord is effective to increase the static strength and the stiffness of T-joints with hollow section. Afterwards, based on the analyzing mechanism for CFCT T-joint under axial compression and tension, the different performances under axial compression and tension between circle hollow tubular T-joint and CFCT T-joint were clarified, and the different failure modes for tubular T-joints with hollow section and CFCT T-joints were compared and analyzed.

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