An innovative joint connecting beam for precast concrete shear wall structures

The precast shear wall structure has outstanding features in green buildings, due to the construction convenience, safety, high quality and low pollution. In general, precast concrete shear walls are connected by multiple joints. The joint between precast walls has very strong influence on the whole structure, which calls for more detailed investigation. A new kind of connection – joint connecting beam was developed to connect the vertical reinforcements in precast concrete shear wall structures. This innovative connecting method has the advantages of convenient operation and saving steel. To evaluate the performance and for better application of joint connecting beam, an experiment on seven full-scale specimens was conducted under cyclic loading, including two cast-in-situ walls and five precast walls varying in different reinforcement and sectional height of joint connecting beam. The comparison between cast-in-situ walls versus precast walls with joint connecting beam was performed, focusing on failure mode, hysteretic curve, skeleton curve, bearing capacity, ductility and energy-dissipating capacity. The result shows that the joint connecting beam can effectively transfer the load of precast walls, especially for squat precast walls. Moreover, the finite element models were built up to simulate the performance of the specimens. The simulation results agree well with experimental results.

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