Behaviour and design of high-strength Grade 12.9 bolts under combined tension and shear

Li, Dongxu; Uy, Brian; Wang, Jia; Song, Yuchen

doi:10.1016/j.jcsr.2020.106305

Cited by 26 publications

(12 citation statements)

References 33 publications

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“…Lots of damage models have been proposed to explain the fracture of metal material in the past few decades [33,34]. Using reasonable damage models in the simulation of bolt assemblies makes it possible to analyse the fracture behaviour of bolts under different loadings [17][18][19][20][21][22]. As the shear fracture of bolts is the major concern in this study, an appropriate damage model which could predict the shear fracture of metal material is adopted in the analysis.…”

Section: Fracture Criterionmentioning

confidence: 99%

“…Fracture properties of the structural bolts were simulated through calibrating steel damage models in the numerical analysis. Song et al [19,20] reported a comprehensive study on the behaviour of stainless bolts under combined tension and shear. Fracture of the stainless bolts under combined tension and shear was simulated using a calibrated steel damage model.…”

Section: Introductionmentioning

confidence: 99%

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Fracture simulation of a demountable steel-concrete bolted connector in push-out tests

Yang

Liu

Xin

et al. 2021

Engineering Structures

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Many bolted connectors were proposed for use in steel-concrete composite structures over the past few decades. This is because using bolted connectors could make the assembly and disassembly of steel-concrete composite structures more convenient and reusing the dismantled structural components could also improve structural sustainability. Lots of static and fatigue experimental tests on steel-concrete bolted connectors were conducted but detailed finite element simulations including fracture of bolted connectors were rarely reported. This paper presents a series of simulations of a demountable steel-concrete bolted connector in push-out tests, which was proposed and reported by the authors of this paper before. Damage models of bolt and concrete materials are incorporated in the simulations to better understand the behaviour of the bolted connector and the failure mode of the push-out tests. Direct tension tests on bolts are simulated to calibrate the stress-strain relationship of bolt material and assumed pure shear tests on bolts are modelled to validate the fracture criterion used in the simulations. Results of modelling push-out tests indicate that the friction force at the steel-concrete interface accounts for a part of shear resistance of the bolted connector in push-out tests conducted. The load-slip curves and the fracture of bolts in push-out tests can be approximately predicted by incorporating damage models of bolt and concrete materials and considering an appropriate friction coefficient. The effects of concrete damage model, clearance in bolt hole, and pretension of short bolt on the shear performance of the bolted connector are discussed at last.

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Section: Fracture Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fracture simulation of a demountable steel-concrete bolted connector in push-out tests

Yang

Liu

Xin

et al. 2021

Engineering Structures

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“…Nevertheless, bolted joints are generally exposed to combined actions in steel structures applications, including combined tension and shear actions, twin shear actions, and combined tension-twin shear actions. The ultimate strength of grade 10.9 bolts [11], grade 12.9 bolts [12], and stainless bolts [13] under combined tension and shear actions has recently been evaluated. The research on ultimate resistance subject to twin shear loading and combined tension-twin shear loading is limited.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the strength of grade 10.9 bolts subject to multiaxial loading using the micromechanical failure index: MCEPS

Xin

Veljković

et al. 2022

Steel Construction

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Bolted joints in steel structures are generally subject to combined actions. The research on ultimate capacity of bolted joints under combined tension and shear actions, twin shear actions, and combined tension-twin shear actions is relatively limited. The aim of this paper is to calibrate the fracture locus of grade 10.9 bolts using the mesoscale critical equivalent plastic strain (MCEPS). We use ductile fracture simulation to numerically evaluate the ultimate resistance of bolts subject to multiaxial loading and compare the results with the current design standards. The results show that predictions for grade 10.9 bolts subject to multiaxial loading in Chinese code GB 50017 and American code AISC-360 are not on the safe side, while predictions in European code EN1993-1-8:2005 are slightly on the conservative side. We propose two modification factors to improve prediction of bolt strength subject to multiaxial loading; namely the multiaxial loading factor for shear resistance x v and the multiaxial loading factor for tensile resistance x t .

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“…Moreover, the effect of the geometrical dimensions of the plate, the layout properties of the bolt holes [13,14] and the material properties [15] on the resistance and deformation of the specimen were discussed. In the past decades, high strength bolts with nominal tensile strengths of over 800MPa were widely used in building engineering and the behaviour was investigated [16] . Pretension was required for the high-strength bolts in most cases, while it was not taken into consideration in most investigations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Behaviour of Q345 Steel High-Strength Bolt Bearing-Type Connections

2021

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Static tensile tests were performed on 45 sets of Q345 steel high-strength bolt bearing-type connections, in which grade 10.9 and 12.9 high-strength bolts were used. In the tests, tearout failure, splitting failure, pure bearing failure, net crosssection failure and bolt shear failure were observed. The effect of the thickness and geometrical dimensions of the test plates, and the property grade, diameter, pretension, layout of the bolts on the load -carrying capacity and deformation of the connections were investigated. Further, the experimental results were compared with the calculated values that employed the design methods in GB 50017-2017, Eurocode 3, and the AISC 360-10. And finally, the applicability of the calculation methods in various specifications to the connections with two bolts arranged parallelly to the load was discussed. It was found that bolt specifications controlled the occurrence of the shear failure mode, and the pretension of bolts improved the load-carrying capacity and peak displacement of the specimens with bolt shear failure. Meanwhile, the calculation methods in GB50017-2017 and Eurocode 3 were conservative for predicting the load-carrying capacity of connections, and the calculated resistance using method 2 in AISC360-10 was the closest to the experimental results. And for the shear connection with two bolts arranged parallelly to the load and with a relatively small end distance, the resistance calculated by the simple summation method in Eurocode 3 or AISC360-10 would be higher than the actual load-carrying capacity.

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Behaviour and design of high-strength Grade 12.9 bolts under combined tension and shear

Cited by 26 publications

References 33 publications

Fracture simulation of a demountable steel-concrete bolted connector in push-out tests

Fracture simulation of a demountable steel-concrete bolted connector in push-out tests

Evaluating the strength of grade 10.9 bolts subject to multiaxial loading using the micromechanical failure index: MCEPS

Experimental Study on the Mechanical Behaviour of Q345 Steel High-Strength Bolt Bearing-Type Connections

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