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Influence of boundary conditions on the shear behavior of notched steel plate connectors in push-out tests
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DOI：10.1016/j.istruc.2026.112425.png)
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Abstract
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Rational design of steel-concrete composite structures requires reliable load-slip relationships for shear connectors, typically obtained from push-out tests. This study investigates the influence of boundary conditions on the shear behavior of a novel notched steel plate (NSP) shear connector through push-out tests under four conditions: floor support (F), floor support with lateral restraint (FL), roller support (R), and roller support with lateral restraint (RL). All specimens developed initial horizontal cracks near the NSP shear connector at low loads; subsequent crack patterns depended on the boundary condition, with predominantly vertical cracks under the F and FL conditions, whereas diagonal cracks developed under the R and RL conditions. Based on the present tests, lateral restraint increased the measured shear capacity within each specimen series. The average shear stiffness was comparable between F and FL for the H50T09/H50T12 series and between FL and R for the H75T09 series, whereas the RL condition of H75T09 exhibited a significantly lower stiffness than the FL and R conditions. The steel-concrete interface opening was smaller under FL than under F, and specimens under R and RL exhibited larger openings than those under FL due to rotation. An empirical relationship between slip and residual slip is proposed from the test results.
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4.3
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1.2W
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