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Shear Load-Displacement Curves of PVA Fiber-Reinforced Engineered Cementitious Composite Expansion Joints in Steel Bridges

1
School of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China
2
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
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Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5275; https://doi.org/10.3390/app9245275
Received: 11 November 2019 / Revised: 29 November 2019 / Accepted: 30 November 2019 / Published: 4 December 2019
(This article belongs to the Special Issue Assessment of High-Performance Fiber-Reinforced Concrete Properties)
The concrete in the transition strips of expansion joints can become damaged prematurely during the service period. Polyvinyl alcohol (PVA) fiber-reinforced engineered cementitious composite (ECC) is a kind of high ductility concrete material, and its ultimate uniaxial tensile strain is more than 3%. It can be used to improve the damage status of expansion joints. Based on previous research results, ECCs were used in the pilot project of bridge expansion joints. Under this engineering background, the shear load-displacement curves of ECC expansion joints were studied through 27 groups of compression-shear tests of ECC/steel composite structures. The shear failure characteristics of ECC expansion joints were analyzed by the digital image correlation method. A shear load-displacement curve model of the composite structures was proposed based on the equivalent strain assumption and Weibull distribution theory. The results show that the failure mode of the composite structure specimens was ECC shear cracking. Stress and strain field nephograms were used to explain the failure characteristics of the composite structure specimens. The calculated curves of the shear load-displacement model of the composite structures were in good agreement with the experimental curves. The work is of great importance to the shear design of ECC expansion joints and their further engineering applications. View Full-Text
Keywords: polymer fiber-reinforced engineered cementitious composite (ECC); cement and concrete; shear load-displacement curves; digital image correlation; PVA fiber polymer fiber-reinforced engineered cementitious composite (ECC); cement and concrete; shear load-displacement curves; digital image correlation; PVA fiber
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Yin, L.; Liu, S.; Yan, C.; Zhang, J.; Wang, X. Shear Load-Displacement Curves of PVA Fiber-Reinforced Engineered Cementitious Composite Expansion Joints in Steel Bridges. Appl. Sci. 2019, 9, 5275.

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