Constant-amplitude fatigue behavior of M24 high-strength bolt of end-plate flange connection

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 2041-2053
Author(s):  
Jinfeng Jiao ◽  
Zhanxiang Liu ◽  
Qi Guo ◽  
Yong Liu ◽  
Honggang Lei
Keyword(s):  
Fatigue Behavior ◽  
High Strength ◽  
Constant Amplitude ◽  
Flange Connection ◽  
End Plate ◽  
High Strength Bolt

Experimental and Numerical Studies on the Joint of Special-Shaped Concrete-Filled Rectangular Composite Tubular Column with H-Shaped Beam

2013 ◽  
Vol 671-674 ◽  
pp. 417-423
Author(s):  
Ji Xiong Liu ◽  
Shao Bin Dai ◽  
Yao Peng ◽  
Jun Huang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Plate Thickness ◽  
Great Influence ◽  
High Strength ◽  
Hysteresis Curve ◽  
Element Analysis ◽  
Shaped Beam ◽  
End Plate ◽  
High Strength Bolt

3 extended-end-plate joints of T-shaped concrete-filled rectangular composite tubular column with H-shaped beam were designed. The experimental research and ANSYS nonlinear finite element analysis on the earthquake resistance behaviors of the joints were conducted under low cyclic loading. The results indicate that the shapes of hysteresis curve of each specimen is full and presents spindle, all the specimens possess good energy dissipation capacity. The end-plate thickness and high-strength bolt diameter have a great influence on the bearing capacity of the joints. Increasing the thickness of end-plate and the diameter of high-strength bolt, the displacement ductility factors of the joints decrease slightly, but their ultimate bearing capacities obviously enhance. The stress distributions and the finite element failure characteristics of the joints are basically consistent with the test phenomena, yield bearing capacity and ultimate bearing capacity of the finite element calculations can agree well with the experimental results.

Study on fire resistance of prefabricated concrete beam-column joint with end-plates

2020 ◽  
Vol 11 (4) ◽  
pp. 447-460
Author(s):  
Shufeng Li ◽  
Le Deng ◽  
Zhao Di
Keyword(s):  
Fire Resistance ◽  
Concrete Beam ◽  
Plate Thickness ◽  
High Strength ◽  
Content Type ◽  
Finite Element Software ◽  
Axial Compression Ratio ◽  
End Plate ◽  
High Strength Bolt ◽  
Column Joint

Purpose The purpose of this study is to put forward a high-strength bolt end-plate connection of prefabricated concrete beam-column joint and carry out the pseudo-static test. Design/methodology/approach ABAQUS finite element software is used to study the fire resistance performance of high-strength bolt end-plate prefabricated joint. This mainly considers the influence of axial compression ratio, screw preload, end-plate thickness and steel hoop thickness. Findings The results show that the thickness of end-plate and steel hoop has a certain effect on the fire resistance. The change of screw preload has little effect on the fire resistance limit. Compared with the cast-in-place concrete beam-column joint, the deformation trend of column-beam end of the fabricated joint is basically the same as that of cast-in-place joint. Originality/value To study the mechanical performance of this kind of joint more comprehensively, the finite element software is used to study the prefabricated concrete beam-column joint with end-plates, and the effects of axial compression ratio, screw preload, end-plate thickness and steel hoop thickness on the fire resistance of joints are mainly considered.

Constant amplitude fatigue test research on M20 high-strength bolts in grid structure with bolt–sphere joints

2016 ◽  
Vol 20 (10) ◽  
pp. 1466-1475 ◽  
Author(s):  
Xu Yang ◽  
Honggang Lei ◽  
Y Frank Chen
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
High Strength ◽  
Fatigue Tests ◽  
Structural System ◽  
Structural Components ◽  
Constant Amplitude ◽  
Grid Structure ◽  
Industrial Plants ◽  
High Strength Bolt

The grid structure with bolt–sphere joints is one type of large-span spatial structures. Due to small induced force, light weight, large stiffness, and good seismic performance, such structural system has been widely adopted in industrial plants with suspending cranes. The damage of the grid structure with bolt–sphere joints tends to occur at high-strength bolt joints, with fatigue fracture as the primary failure mode. The alternating and reciprocating action of the suspending crane will cause fatigue problems to the structural components of the grid structure, including rod, cone, sealing plate, bolted sphere, and high-strength bolt. The threads in high-strength bolt result in a significant stress concentration leading to bolt fatigue which is the key issue of fatigue failure. In this study, systematic constant amplitude fatigue tests were conducted for 18 M20 high-strength bolt made of 40Cr material using the developed efficient and smooth loading equipment combined with the Amsler fatigue testing machine, in which the tension condition of the high-strength bolt in the grid structure was simulated, simulation of high-strength bolt in tension works of grid structure. In addition, the signal-to-noise curve and the calculation method of constant amplitude fatigue for the high-strength bolt are proposed in grid structure with bolt–sphere joints.

Experimental Study on the Fatigue Behavior of Cracked Steel Component Repaired with High Strength Bolt Reinforced Stop-hole and CFRP Patched Stop-hole

2019 ◽  
Author(s):  
Xinyi Wu ◽  
Xu Jiang ◽  
Xuhong Qiang ◽  
Jiandong Zhang ◽  
Chenwei Luo
Keyword(s):  
Fatigue Life ◽  
Fatigue Behavior ◽  
High Strength ◽  
Fatigue Loading ◽  
Bridge Engineering ◽  
Element Analysis ◽  
Steel Component ◽  
High Strength Bolt ◽  
Stress Concentration Region ◽  
Crack Initiation Life

<p>The stop-hole method has been used widely to retard the fatigue crack growth of steel component in the field of bridge engineering. However, the component repaired by single stop-hole without any additional reinforcement is liable to crack again because of the drilling defects and new stress concentration region around the hole. In this paper, two kinds of strengthened stop-hole methods, the high strength bolt reinforced stop-hole method and the CFRP patched stop-hole method, were investigated and compared. Finite element analysis was conducted to predict the repair efficiency and investigate the optimal parameters of each method. A total of 12 fatigue damaged specimens were repaired by different ways and tested under fatigue loading subsequently. Experiment results indicate that the fatigue life of specimens repaired by stop-hole is more than 20 times that of the unrepaired specimens. The high strength bolt reinforced stop-hole and CFRP patched stop-hole can extend the fatigue life by 9 and 8 times respectively, compared with the single stop-hole method. Debonding has a decisive effect on the reinforcement effectiveness. In addition, all the three methods studied in this paper can only extend the crack initiation life of the cracked steel component, but can’t affect the crack propagation life.</p>

Rigidity Test Research of Rigid and Flexible Flange Connection in Power-Transformed Frames

2012 ◽  
Vol 204-208 ◽  
pp. 4449-4454
Author(s):  
Hong Bo Li ◽  
Jun Fen Yang ◽  
Yi Liang Peng ◽  
Yang Xiang
Keyword(s):  
Bearing Capacity ◽  
Flexural Rigidity ◽  
High Strength ◽  
Shear Rigidity ◽  
Test Results ◽  
Flange Connection ◽  
High Strength Bolt

The existing research on flange focused on bearing capacity, and there were few reports on the rigidity of flange. In this paper, rigidity test was carried on for the connection of rigid flange and flexible flange in power-transformed frames. According to the test results, the axial rigidity, shear rigidity and flexural rigidity was compared. The results indicated that the axial rigidity, shear rigidity and flexural rigidity of flexible flange connection was lower than those of rigid flange connection for both the plain bolt and high strength bolt.

scholarly journals Fatigue Life Improvement of Cracked Aluminum 6061-T6 Plates Repaired by Composite Patches

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1421
Author(s):  
Armin Yousefi ◽  
Saman Jolaiy ◽  
Reza Hedayati ◽  
Ahmad Serjouei ◽  
Mahdi Bodaghi
Keyword(s):  
Fatigue Life ◽  
Fatigue Behavior ◽  
Weight Ratio ◽  
High Strength ◽  
Plastic Strain Amplitude ◽  
Composite Patch ◽  
Life Improvement ◽  
Cracked Structures ◽  
Aluminum Plates ◽  
High Flexibility

Bonded patches are widely used in several industry sectors for repairing damaged plates, cracks in metallic structures, and reinforcement of damaged structures. Composite patches have optimal properties such as high strength-to-weight ratio, easiness in being applied, and high flexibility. Due to recent rapid growth in the aerospace industry, analyses of adhesively bonded patches applicable to repairing cracked structures have become of great significance. In the present study, the fatigue behavior of the aluminum alloy, repaired by a double-sided glass/epoxy composite patch, is studied numerically. More specifically, the effect of applying a double-sided composite patch on the fatigue life improvement of a damaged aluminum 6061-T6 is analyzed. 3D finite element numerical modeling is performed to analyze the fatigue performance of both repaired and unrepaired aluminum plates using the Abaqus package. To determine the fatigue life of the aluminum 6061-T6 plate, first, the hysteresis loop is determined, and afterward, the plastic strain amplitude is calculated. Finally, by using the Coffin-Manson equation, fatigue life is predicted and validated against the available experimental data from the literature. Results reveal that composite patches increase the fatigue life of cracked structures significantly, ranging from 55% to 100% for different applied stresses.

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