Experimental research on slip-resistant bolted connections after fire

Lou, Guobiao; Zhu, Meifang; Li, Ming; Zhang, Chao; Li, Guoqiang

doi:10.1016/j.jcsr.2014.09.018

Cited by 20 publications

(7 citation statements)

References 1 publication

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“…The bolt pre-tension loss is considered as a characteristic example (Lou et al, 2015). Heating to temperatures lower than 300°C produces a reversible thermal expansion so that the bolt regains its lost pre-tension force.…”

Section: Simultaneous Loadingmentioning

confidence: 99%

“…greater than 320°C) than structural steel, as the bearing failure mode changes to bolt shear failure. Interestingly, Lou et al (2015) addressed the issue of slip-resistant bolted connections. The results indicated that the increase in the slip factor offsets the pre-load reduction in a way that the bolts exposed to temperatures lower than 300°C can be reused.…”

Section: S T Smentioning

confidence: 99%

“…The mechanical behavior of connections also plays a substantial role in the heating or cooling phase of an axially restrained member. For this purpose, many experimental studies deal with high-strength bolt failure after exposure to high temperatures and subsequent cooling down (Yu, 2006;Renner et al, 2014;Kawohl et al, 2014;Lou et al, 2012Lou et al, , 2015Hanus et al, 2011) to identify both the range and the causes of deterioration. In general, although the mechanical behavior of both structural steel and bolts depends on various factors (such as the steel type, manufacturing process, heating temperature and duration, cooling rate, etc.…”

Section: Introductionmentioning

confidence: 99%

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Post-fire assessment and reinstatement of steel structures

Maraveas

Fasoulakis²,

Tsavdaridis

2017

JSFE

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Purpose This paper aims to present technical aspects of the assessment method and evaluation of fire damaged steel structures. The current work focuses on the behavior of structural normal steel (hot-rolled and cold-formed) and high-strength bolts after exposure to elevated temperatures. Information on stainless steel, cast iron and wrought iron is also presented. Design/methodology/approach Because of the complexity of the issue, an elaborate presentation of the mechanical properties influencing factors is followed. Subsequently, a wide range of experimental studies is extensively reviewed in the literature while simplified equations for determining the post-fire mechanical properties are proposed, following appropriate categorization. Moreover, the reinstatement survey is also comprehensively described. Findings Useful conclusions are drawn for the safe reuse of the structural elements and connection components. According to the parametric investigation of the aforementioned data, it can be safely concluded that the most common scenario of buildings after fire events, i.e. apart from excessively distorted structures, implies considerable remaining capacity of the structure, highlighting that subsequent demolition should not be the case, especially regarding critical infrastructure and buildings. Originality/value The stability of the structure as a whole is addressed, with aim to establish specific guidelines and code provisions for the correct appraisal and rehabilitation of fire damaged structures.

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Section: Simultaneous Loadingmentioning

confidence: 99%

Section: S T Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Post-fire assessment and reinstatement of steel structures

Maraveas

Fasoulakis²,

Tsavdaridis

2017

JSFE

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“…The literature review reveals that knowledge of the post-fire behaviour of steel structures is limited. Most studies of the literature focus on the post-fire behaviour of bolted or welded connections [24][25][26][27][28][29][30][31][32] while research on the global behaviour of structures or structural members is limited [33,34].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Post-Fire Performance of Steel Columns

2022

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Research on the seismic performance of steel structures has led to the development of improved structures, which minimize structural and non-structural damage and can be reused immediately after an earthquake. Moreover, significant advances have been made for predicting the response of steel members, connections, and structural systems exposed to fire. Nevertheless, the research on the reuse of steel structures after a fire event is limited. A steel structure designed according to the current seismic codes can survive a fire without significant structural damage and may be repaired and reused. Therefore, it is of great importance to study whether the reuse of steel structures after a fire is safe in high seismicity areas. This paper investigates the seismic performance of steel columns that are pre-damaged due to fire. For this purpose, sophisticated finite element models have been developed and validated against experimental data. It was concluded that the models accurately predict the behaviour of beams-columns at elevated temperatures. First, the behaviour of the columns was studied using simplified boundary conditions; the surrounding structure was not included in the numerical model. Thermal-structural analyses were performed to determine the structural damage induced by the fire. Subsequently, the cyclic performance of the columns was investigated, considering both the residual post-fire deformations and the proper material properties. Aiming to obtain more realistic results, the complicated interaction between the heated columns and the surrounding structure was considered in the modelling. For this reason, the fire behaviour of a seismic resistant frame was simulated. Then, the behaviour of fire-damaged columns under cyclic loading was assessed. The analysis of the results demonstrates the effect of the post-fire damage on the cyclic behaviour of columns.

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“…Król and Wachowski [7] found that the temperature level of the fre, fre duration, and fre-fghting method signifcantly afect the bolts' mechanical properties. Lange and González [8], Lou et al [9], and Zhu et al [10] studied the mechanical properties, slip coefcient, and pretension force of high-strength grade 10.9 bolts at high temperatures. Hanus et al [11] investigated the mechanical behavior of high-strength grade 8.8 bolts under the situation of "nature fre," which means a temperature history including both heating and cooling phases.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of High-Strength Bolted Joints Fabricated from Fire-Resistant Steel at Elevated Temperatures

Wang

Li²,

Liu³

et al. 2022

Advances in Materials Science and Engineering

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The use of fire-resistant steel is an effective way to alleviate fire safety issues in steel structures. Considering the limited research on bolted joints fabricated from fire-resistant steel, this study presents the results of the experimental investigation on the mechanical behavior of 40 specimens of bolted joints at room temperature and elevated temperatures (20°C∼700°C). These specimens are assembled with fire-resistant steel plates and fire-resistant high-strength bolts (or ordinary high-strength bolts). The mechanical behavior of these specimens was investigated, which included the failure mode, deformation performance, and degradation of bearing capacity. The experimental results show that the treatment of the friction surface (specifically, impeller blasting and sprayed hard quartz sand) has a negligible effect on the ultimate strength of specimens and a relatively significant effect on the slip strength. In addition, reduction factors of the tensile strength (KN) and slip strength (KS) for both fire-resistant bolt specimens and ordinary high-strength bolt specimens decrease with the increase in temperature, especially in the case of elevated temperatures ranging from 400°C to 700°C. Prediction models with different reliability degrees are proposed to calculate the degradation of tensile strength under elevated temperatures, which has the potential to be used for the fire-resistant design of steel connections and structures.

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Experimental research on slip-resistant bolted connections after fire

Cited by 20 publications

References 1 publication

Post-fire assessment and reinstatement of steel structures

Post-fire assessment and reinstatement of steel structures

Numerical Investigation of the Post-Fire Performance of Steel Columns

Mechanical Behavior of High-Strength Bolted Joints Fabricated from Fire-Resistant Steel at Elevated Temperatures

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