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Shear Strength of Steel Fiber-Reinforced Concrete Dry Joints in Precast Segmental Bridges
Dry joints represent locations of discontinuity in precast concrete segmental bridges (PCSBs) through which compressive and shear stresses must be transmitted. Cracks in dry joints occur more easily than those in epoxy joints during the construction period or in service. Steel fiber-reinforced concrete (SFRC) with high rupture strength might be beneficial to the shear resistance of dry joints. In this study, shear behavior of various types of dry joints in PCSBs was investigated by experiments, especially focusing on shear strength of keyed dry joints of SFRC. The experimental parameters were joint types, concrete types, key numbers, contacting portions in the sliding plane, and horizontal confining stress levels. Cracking loads, cracking patterns, failure modes, and ultimate loads were recorded. Normalized shear stress-vertical slip curves and load-horizontal dilation relationships have been investigated. It can be concluded that the use of SFRC can improve shear strength and ductility of dry joints in PCSBs. The experimental results obtained from tests were compared with other design provisions. These provisions underestimate the shear capacity of single-keyed dry joint specimens of conventional concrete and SFRC and overestimate those of three-keyed dry joints of conventional concrete, whereas the design formula can accurately predict the shear strength of three-keyed dry joints of SFRC.
Shear Strength of Steel Fiber-Reinforced Concrete Dry Joints in Precast Segmental Bridges
Dry joints represent locations of discontinuity in precast concrete segmental bridges (PCSBs) through which compressive and shear stresses must be transmitted. Cracks in dry joints occur more easily than those in epoxy joints during the construction period or in service. Steel fiber-reinforced concrete (SFRC) with high rupture strength might be beneficial to the shear resistance of dry joints. In this study, shear behavior of various types of dry joints in PCSBs was investigated by experiments, especially focusing on shear strength of keyed dry joints of SFRC. The experimental parameters were joint types, concrete types, key numbers, contacting portions in the sliding plane, and horizontal confining stress levels. Cracking loads, cracking patterns, failure modes, and ultimate loads were recorded. Normalized shear stress-vertical slip curves and load-horizontal dilation relationships have been investigated. It can be concluded that the use of SFRC can improve shear strength and ductility of dry joints in PCSBs. The experimental results obtained from tests were compared with other design provisions. These provisions underestimate the shear capacity of single-keyed dry joint specimens of conventional concrete and SFRC and overestimate those of three-keyed dry joints of conventional concrete, whereas the design formula can accurately predict the shear strength of three-keyed dry joints of SFRC.
Shear Strength of Steel Fiber-Reinforced Concrete Dry Joints in Precast Segmental Bridges
Jiang, Haibo (author) / Wei, Rongbin (author) / John Ma, Zhongguo (author) / Li, Yuhong (author) / Jing, Yuan (author)
2016-06-27
Article (Journal)
Electronic Resource
Unknown
Shear Strength of Steel Fiber-Reinforced Concrete Dry Joints in Precast Segmental Bridges
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