Experimental study on bearing capacity of corroded high-strength bolt connections under shear force

Kong, Zhengyi; Yang, Fan; Jin, Ya; Hong, Shaozheng; Wang, Xueqing; Vu, Quang-Viet; Truong, Viet-Hung; Yu, Bo; Kim, Seung-Eock

doi:10.1016/j.conbuildmat.2021.125117

Cited by 18 publications

(8 citation statements)

References 29 publications

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“…A shear connection with four high-strength tension control bolts is simulated using ABAQUS. Similar with Kong et al [17] and Hong's test [18], Q345 steel is adopted for cover plates and inner plates. Grade 10.9 high-strength bolts with a diameter of 20 mm are utilized.…”

Section: Finite Element Analysismentioning

confidence: 99%

“…Mesh size for steel plates is 8.8 mm, and 1.5 mm for bolts is utilized. All contacts are selected as surface-to-surface contact, and the friction coefficient is established from Kong et al [17] and Hong's test [18].…”

Section: Finite Element Analysismentioning

confidence: 99%

“…According to GB 50017-2017 [5], the preload force of Grade 10.9 high-strength bolts is 155 kN, and the effect of stress relaxation of high-strength bolts is considered according to Hong's test [18]. In order to investigate the preload force loss of high-strength bolts, a stiffness reduction method is used to simulate the corrosion on the high-strength bolts connections.…”

Section: Fig 1 Finite Element Modelmentioning

confidence: 99%

“…To the best of authors' knowledge, only Ahn et al [15] employed the loss of sectional area of high-strength bolts to consider the influence of corrosion on the preload force of high-strength bolts using experimental method, and a model was suggested for predicting the residual value of the preload force of high-strength bolts. Jiang et al [16], Kong and Hong [17], and Hong [18] performed test to study the preload force loss of high-strength bolts after corrosion, and the results showed that the preload force loss reached 41.2% when the corrosion rate reached 10%. In this study, a finite element method is developed to investigate the preload force loss of high-strength bolts after corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Preload Force Loss of Corroded High- Strength Bolts

2022

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Corrosion significantly affects the structural behavior of members in a connection (i.e., the preload force of bolts, the thickness of steel plates, and the anti-sliding friction of steel plates). The preload force of bolts is a key factor affecting the bearing capacity of high-strength bolts shear connections, and it will be significantly influenced by corrosion. In this study, the preload force loss of high-strength bolts shear connections after corrosion is studied. A finite element model validated by previous experiment is developed for estimating the preload force loss of high-strength bolts after corrosion. The value of the preload force loss of corroded highstrength bolts increases as the corrosion rate, but the effect of steel grade on the preload force loss is not obvious. Based on the results of finite element analysis, a degradation model for predicting the preload force loss of corroded high-strength bolts is suggested, and the degradation model agrees well with various test data. The results of this study can provide a reference for safety assessment of corroded high-strength bolted shear connections.

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Section: Finite Element Analysismentioning

confidence: 99%

Section: Finite Element Analysismentioning

confidence: 99%

Section: Fig 1 Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Preload Force Loss of Corroded High- Strength Bolts

2022

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“…However, what should be noted is that almost all of the existing bond-slip models have been developed based on a default assumption that the steel substrate is flat and intact. For the existing steel structures that may need to be strengthened with CFRP, generally, they have been in service for a long time, and it is difficult to avoid corrosion on the surface of steel structures [ 30 , 31 , 32 ]. Limited experimental data have shown that corrosion damage would not only form the uneven rust pits on the steel substrate, but also change the surface roughness, contact area, and surface free energy of the steel substrate, which would inevitably affect the bonding performance between the CFRP material and the steel substrate [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Bond-Slip Model for CFRP Plate Externally Bonded to Corroded Steel Plate

2022

Materials

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The purpose of this study is to establish the interfacial bond-slip model for CFRP plate externally bonded to corroded steel plate. The present bond-slip models for CFRP materials bonded to uncorroded steel plate were first reviewed. Thirty-four double-lap joints were tested to investigate the effect of corrosion duration and adhesive thickness on the bond behavior between CFRP plates and corroded steel plates, and the bond-slip curves for the bonding interface with different adhesive thickness and corrosion duration were obtained combined with the CFRP plate strain distribution data. A new bond-slip model for CFRP plate externally bonded to corroded steel plate was proposed, and the expression of the characteristic parameters, which included the maximum bond resistance τf, the relative slip at the peak bond stress s1, the fitting parameter α, and the interfacial fracture energy Gf, were also developed based on the careful regression analysis of the present data. The influence of the corrosion duration and construction adhesive thickness on the bond-slip relationship were accounted together and expressed as a new parameter; that is, the effective adhesive thickness teff. The comparison between the predicted values and experimental results indicated that the proposed bond-slip model can be applied to reproduce the structural response of the CFRP plate-corroded steel plate double-lap joint with reasonable accuracy. The outcome of this study can provide meaningful references and essential data for the reliable application of CFRP strengthening systems in the performance improvement of corroded steel structures.

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