Abstract
The friction-type bolted joint transfers the internal forces in the structural members by interface friction, but noticeable seasonal temperature and bolt fracture cause the redistribution of interface friction and threaten the joint safety. Therefore, this study carried out finite element analysis on the interface friction considering the influence of seasonal temperature and bolt fracture. Through finite element analysis, the simulation of interface friction under seasonal temperature revealed the distribution of temperature induced interface friction in different areas and locations. Further simulation of fractured bolts revealed the influence of quantity and location of fractured bolts on the redistribution of interface friction. Finally, the interface frictions in the bolted joint were evaluated using limit state equations. The results showed that: 1) the quantity and location of fractured bolts cause obvious redistribution of interface friction in the bolt-fractured areas; 2) the quantity and location of fractured bolts have slight effect on the total interface friction in the whole splice plate; 3) the reduced interface friction in the bolt-fractured areas was transferred to the areas without bolt fracture, producing little change in the total interface friction; 4) all the splice plates had abundant safety margin after analysis of their limit state equations.
Highlights
Bolts have been widely used in the joints to connect the members of steel structures (Bednarz III & Zhu, 2014; Ju& Oh, 2016; Wu, Cao, Han, & Ren, 2017; Yeum & Dyke, 2015), especially in the steel truss bridges such as the Dashengguan Railway Bridge (Jin, 2013)
For the frictional bolt joint with high strength (FBJHS), the interface friction on the contact surfaces of splice plates plays a critical role in transferring the internal forces from one steel truss member to another
The Dashengguan Railway Bridge is one long-span steel truss arch bridge (Figure 1), and friction-type high-strength bolt is used in this bridge to connect the numerous truss members, but from December 2010 to March 2016 a total of 277 fractured bolts were found from this bridge (Zhu, 2016)
Summary
Bolts have been widely used in the joints to connect the members of steel structures (Bednarz III & Zhu, 2014; Ju& Oh, 2016; Wu, Cao, Han, & Ren, 2017; Yeum & Dyke, 2015), especially in the steel truss bridges such as the Dashengguan Railway Bridge (Jin, 2013). One top chord member in the Dashengguan Railway Bridge contains 16 splice plates and over 700 friction-type high-strength bolts Concerning such FBJHS, relevant studies usually focus on the interface friction in the bolted joint before bolt fracture, and it is difficult to answer whether the bolted joint still satisfies the safety demand after bolt fracture. What is mentioned is that the results are only subjected to the seasonal temperature, and the results ignore the influence of trains and gradient temperature Such a case usually occurs between 12 a.m. and 6 a.m., and during this period the temperature field in the Dashengguan Railway Bridge is uniform, and the bridge traffic is closed either (Wang & Ding, 2015). Future research work will focus on more influence factors including temperature gradient, running trains and bolt fracture for the safety evaluation of the FBJHS
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