Abstract
The reinforcement sleeve splicing technique has been utilized extensively in precast concrete shear wall structures, as it allows for achieving similar lateral capacity and deformation ability with cast-in-place (CIP) walls. However, investigation on shear behavior of the horizontal joint using this vertical connection is limited. In this study, six specimens of grout-sleeve (GS) joints designed for precast shear wall structures with single-row distributed reinforcements were subjected to cyclic loading tests under pure shear conditions, accompanied by three companion concrete-to-concrete (CC) joint specimens. The study investigated the influence of interfacial reinforcement ratio and surface roughness on the seismic performance of GS joints with different design details, aiming to understand their shear failure mechanism. The joint behavior under cyclic shear loading, including transverse dilation, strain development, and energy dissipation, was analyzed. Experimental results indicated that all specimens exhibited a significant pinching effect and strength degradation in hysteretic curves. Two types of shear failure, sliding failure along the grout-concrete interface with minimal wall cracking and diagonal compression failure with extensive concrete crushing above the grouted layer, are observed due to the roughness of the grout-concrete interface. This roughness also affects the curvature profile of interfacial reinforcement. A larger interfacial reinforcement ratio or a roughened interface can significantly increase the shear strength of the horizontal joints. However, although the GS joint and CC joint have similar failure modes, the variation in cracking patterns resulted in a reduction of up to 10.6 % in shear strength for the grout-sleeve joint. Nonetheless, it exhibited relatively ductile shear behavior compared to the concrete-to-concrete joint. A comparison of shear strength evaluation between five existing codes shows that Eurocode 2 gives the closest result to the test values.
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