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Tests and calculation methods for the shear performance of steel shear keyed joint segment beams

Zou Yu, Xu Dong, Duanmu Xiangyong

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 2

art. no. e128, 2024

Precast concrete segmental bridges (PCSBs) are being constructed in great numbers worldwide. The kind of shear keyed joints is crucial for transmitting shear forces and significantly impacts the PCSBs' shear performance. However, few studies evaluate the shear strength of the segmental beams with steel keyed joints. This study examined the shear performance of segmental beams with steel keyed joints both theoretically and experimentally. First, bending shear tests were used to compare the shear performance of joints made of steel key and general concrete key. The tests were carried out to assess the crack propagation, beam deformation, stiffness, failure mode, and shear capacity of joints. The stress mechanism of the segmental beams with steel keyed joints was subsequently revealed, the calculation diagram was constructed, and the improved analytical equation of shear strength was proposed to predict the shear capacity of the segmental beams with steel keys. Finally, a comparison was made between the experimental results from these tests, the analytical equations, and the current specification. The test findings showed that the prestressing tendons, the steel key, and the concrete in the shear compression zone supported the external load after the major crack formed. The steel key had a dowel action in segmental beams, which was conducive to the shear resistance of joints. At the same time, segmental beams with steel keys had a shear strength that was 13% higher than those with concrete keys. The AASHTO overestimates the shear capacity of the segmental beams with steel keys, the JTG/T and Strut-and-Tie model underestimate it, whereas the derived formulas can generally predict it.