Mechanical properties of high-strength bolts after fire

Lou, Guobiao; Yu, Sophia; Wang, Rui; Li, Guoqiang

doi:10.1680/stbu.11.00015

Cited by 23 publications

(12 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The material properties of Grade 8.8 bolt assembly at ambient temperature without fire exposure input herein are in accordance with those reported by the University of Sheffield in literature (Hu et al, 2007(Hu et al, , 2008Hu, 2009) (Theodorou, 2003), and the remaining factors of mechanical properties of Grade 8.8 bolt assembly after fire reported by Lou et al (2010) are used herein. The material properties of high strength steels S690 and S960 after cooling down from fire input in this finite element model are obtained by the experimental study presented in references (Qiang et al, 2012.…”

Section: Materials Propertiessupporting

confidence: 69%

Performance assessment on high strength steel endplate connections after fire

Qiang

Jiang

et al. 2017

JSFE

View full text Add to dashboard Cite

If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.*Related content and download information correct at time of download. Design/methodology/approach -An experimental and numerical study on seven endplate connections after cooling down from fire temperature of 550°C has been carried out and reported herein. Moreover, the provisions of European design standard for steel structures, Eurocode 3, were validated with test results of high strength steel endplate connections.Findings -In endplate connections, a proper design using a thinner high strength steel endplate can achieve the same failure mode, similar residual load bearing capacity and comparable or even higher rotation capacity after cooling down from fire. It is found that high strength steel endplate connection can regain more than 90 per cent of its original load bearing capacity after cooling down from fire temperature of 550°C.Originality/value -The post-fire performance of high strength steel endplate connection has been reported. The accuracy of Eurocode 3 for endplate connections is validated against test results.

show abstract

Section: Materials Propertiessupporting

confidence: 69%

Performance assessment on high strength steel endplate connections after fire

Qiang

Jiang

et al. 2017

JSFE

View full text Add to dashboard Cite

show abstract

“…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. Lou et al [13] completed an extensive series of fire tests on structural bolts (grades 8.8 and 10.9) to look into the after-fire performance. Different cooling conditions (cooling in air and cooling in furnace) were taken into account in Lou et al's research to produce the feasible reduction factors for bolts after fire.…”

Section: Introductionmentioning

confidence: 99%

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

Shen

Nie

et al. 2016

Journal of Constructional Steel Research

View full text Add to dashboard Cite

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.

show abstract

“…This test method can be used to evaluate the bolt residual strength during the cooling phase. There are many tests on high strength bolts found in the literature subjected to natural fire conditions [17,20,73].…”

Section: Testing Proceduresmentioning

confidence: 99%

“…European designations will be used hereafter, however, when a specific reference is being discussed, the designation of the reference will be adopted. Table Tested parameter at ambient temperature during the last century Re-evaluation at elevated temperature during the last two decades Bolt grade 10.9 [8,[12][13][14][17][18][19] Bolt grade 8.8 [7, 10-12, 14, 17, 20] Bolt grade 5.6…”

Section: Introductionmentioning

confidence: 99%

Behaviour of stainless and high strength steel bolt assemblies at elevated temperatures — A review

Shaheen

Foster

Cunningham

et al. 2020

Fire Safety Journal

View full text Add to dashboard Cite

This study documents important aspects of bolt assembly performance in structural steel connections at elevated temperatures that have not been the subject of detailed investigation to date. The codified strength reduction factors listed in the European and US standards are evaluated against experimental results obtained from the literature. It is concluded that the codified reduction factors should be updated as they are in many cases found to be non-conservative, particularly in the high temperature ranges. The effect of fire on the microstructure of steel bolts is also discussed, providing an insight into the roles that phase transformation and metallurgical failure play in the performance of high strength and stainless steel bolt assemblies at elevated temperatures. The study concludes by proposing a new reduction factor equation, based upon experimental results found in the literature.

show abstract

Mechanical properties of high-strength bolts after fire

Cited by 23 publications

References 3 publications

Performance assessment on high strength steel endplate connections after fire

Performance assessment on high strength steel endplate connections after fire

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

Behaviour of stainless and high strength steel bolt assemblies at elevated temperatures — A review

Contact Info

Product

Resources

About