The behaviour of high-strength grade 8.8 bolts in fire

Kirby, B.R.

doi:10.1016/0143-974x(94)00013-8

Cited by 130 publications

(98 citation statements)

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“…Thread stripping causes the reduction or loss of tensile resistance of structural bolts, which has been demonstrated in the experimental tests of Kirby [6] and Hu et al [7]. They also indicated that the performance of assembled bolts and nuts at high temperatures would be affected by factors related to the manufacturing process and the variation in tolerance classes.…”

Section: Introductionmentioning

confidence: 91%

“…In 1995, Kirby from British Steel developed an experimental program on grade 8.8 high-strength structural bolts in fire, studying their fire performance under shear and tension [6]. The most valuable finding in this research is a strength reduction model produced for structural bolts at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The launched experimental program for 8.8 high-strength structural bolts (to BS 4190 and BS EN ISO 4014) was intended to verify an approach (proposed by Kirby) that 8.8 high-strength bolts assembled with nuts of one property class higher are capable of preventing the premature failure at high temperatures [6]. The component tests have been carried out at the Structural Laboratory of the University of Sheffield.…”

Section: Experimental Programmentioning

confidence: 99%

“…The most valuable finding in this research is a strength reduction model produced for structural bolts at high temperatures. Reference [6] also reported the failure mechanisms observed of structural bolts with different types of Property Class eight nuts. Hanus et al [12] investigated the behavior of Grade 8.8 bolts under natural fire conditions (considering the influence of heating-cooling cycles), and found that the mechanical behavior was seriously affected by temperature variation during the heating and cooling phases.…”

Section: Introductionmentioning

confidence: 99%

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FE simulation and experimental tests of high-strength structural bolts under tension

Shen

Nie

et al. 2016

Journal of Constructional Steel Research

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Highlights Bolts mating with nuts of higher class can lead to a higher probability in failure  8.8 structural bolts mating with bright nuts failed by thread stripping  In the numerical simulation, influence of different material laws was small  Some discrepancy in load-displacement relationship can be observed  Numerical simulation was capable of representing the failure mechanisms -1 - FE Simulation and Experimental Tests of High Strength Structural Bolts under Tension-2 - ABSTRACTExperimental tests has been completed for high strength 8.8 bolts for studying their mechanical performance subjected to tensile loading. As observed from these tests, failure of structural bolts has been identified as in one of two ways: threads stripping and necking of the threaded portion of the bolt shank, which is possibly due to the degree of fit between internal and external threads. Following the experimental work, a numerical approach has been developed for demonstration of the tensile performance with proper consideration of tolerance class between bolts and nuts. It has been found that the degree of fit between internal and external threads has been identified as a critical factor affecting failure mechanisms of high strength structural bolts in tension, which is caused by the machining process. In addition, different constitutive material laws have been taken into account in the numerical simulation, demonstrating the entire failure mechanism for structural bolts with different tolerance classes in their threads. It is also observed that the bolt capacities are closely associated with their failure mechanisms.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Experimental Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

FE simulation and experimental tests of high-strength structural bolts under tension

Shen

Nie

et al. 2016

Journal of Constructional Steel Research

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“…EC3 [40] provides the stress-strain relationship and the reduction coefficients (Fig 9) for normal steel, dependent on the temperature, to affect the values at room temperature (yield strength f y , proportional limit f p and Young modulus E). In addition, in its Annex D recommends specific strength reduction factors for steel bolts, which are based on research done by Kirby [41]. Figure 10 shows the true stress-strain curve for the steel bolts in the single blind-bolted connection at different temperatures, so, as in room temperature the reduction of the volume was considered.…”

Section: Mechanical Materials Properties At Elevated Temperaturesmentioning

confidence: 99%

Fire performance of blind-bolted connections to concrete filled tubular columns in tension

Pascual

Romero

Tizani

2015

Engineering Structures

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This paper describes an advanced numerical model to predict the fire behaviour of blind-bolts in the tension area of endplate connections between I-beams and concrete filled tubular (CFT) columns. It is the continuation of a previous research on the thermal response of connections, considering the tension load of a moment-resisting connection. Due to the absence of experiments and data on blind-bolts fire performance the aim was to provide a model for their study. The effect of two main variables was researched, the concrete infill of the columns and the anchored extension of the blind-bolt. The fire resistance rating (FRR), the failure mode and the force-displacement-temperature curve at high temperatures were discussed. Results proved that concrete inside the column enhances the connections response at elevated temperatures in terms of FRR and stiffness. On the other hand, the use of anchored blind-bolts compared with normal blind-bolts provided stiffer connections, but the FRR improvement depended on the plate thickness and steel bolt properties. Finally, the use of fire resistant steel bolts as a method to enhance the fire response was assessed, observing the benefits to these connections when the shank of the blind-bolt governs the failure.Pascual A M, Romero M L, Tizani W. Fire performance of blind-bolted connections to concrete filled tubular columns in tension. Engineering structures 2015;96:111-125. http://dx

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Selecting Suitable Bolt Parameters to Achieve Ductility at Elevated Temperatures

et al. 2021

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A detailed FE study is presented investigating the factors affecting failure modes of bolt assemblies under tensile force at ambient and elevated temperatures. Axisymmetric FE models incorporating important behavioural aspects including surface interaction and damage modelling were developed. Stripping failure is generally undesirable because it results in premature failure of the bolt, which can deteriorate the rotational capacity of connections and robustness of steel frames. The paper discusses how the thread length in the grip Lt can affect the failure mode of bolt assemblies at elevated temperatures. This paper concludes that at ambient temperature, stripping can occur at certain Lt length dependent upon the nut dimension deviation from the basic profile; this length reduces with temperature.

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The behaviour of high-strength grade 8.8 bolts in fire

Cited by 130 publications

References 0 publications

FE simulation and experimental tests of high-strength structural bolts under tension

FE simulation and experimental tests of high-strength structural bolts under tension

Fire performance of blind-bolted connections to concrete filled tubular columns in tension

Selecting Suitable Bolt Parameters to Achieve Ductility at Elevated Temperatures

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