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Shear behaviour of segmented cast UHPFRC beams with moderate shear span-to-depth ratio considering the influence of wet-joint shape
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DOI：10.1016/j.istruc.2026.112344.png)
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Abstract
En 中文
Despite the increasing application of segmented cast UHPFRC (SC-UHPFRC), systematic research on how keyed-joint geometry affects the inclined-section shear performance remains lacking. To address this gap, this study investigates the shear behavior of SC-UHPFRC beams with a moderate shear span-to-depth ratio of 2.4 under combined flexural-shear loading, focusing on wet-joint geometry. Experimental results demonstrate that cracking typically initiated as vertical cracks at the wet keyed joint, followed by the propagation of diagonal shear cracks along its shear-weakened surface. SC-UHPFRC beams with flat, single-keyed, and corbel-keyed joints failed in a brittle manner. Compared to monolithic cast UHPFRC (MC-UHPFRC) beams, the load-bearing capacities of SC-UHPFRC beams decreased by 14.35% (corbel-keyed), 11.23% (single-keyed), and 2.41% (double-keyed), whereas the flat-joint specimen exhibited nearly identical capacity. Furthermore, a finite element analysis validated by experimental data demonstrates that failure modes and ultimate loads are fundamentally governed by interfacial mechanical behavior, principal compressive stress continuity, and joint geometry. In corbel-keyed-joint beams, the stress distribution follows an arch-truss model, where diagonal shear cracks initiate at the weak bond interface along specific load paths. Ultimately, the failure mechanism is dictated by an inclined compressive field defined by the principal compressive stress trajectories. Therefore, engineering design must rationally plan joint locations and select configurations that harmonize with the principal stress flow.
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