Study on seismic performance of precast fabricated RC shear wall with opening filling

Six double-short-limb reinforced concrete (RC) prefabricated shear walls with different infill wall were constructed and tested under cyclic horizontal load and constant vertical load to study the seismic performance, including unfilled shear wall, ceramsite concrete hollow block masonry infilling, concrete integration infilling with hollow tube (HTCI), concrete integration infilling with polystyrene plate sandwich (PPSCI), lightweight partition board infilling and ceramsite concrete infilling. The hysteretic curve, failure mode, stress feature, shear bearing capacity, deformation ability, stiffness, ductility and energy dissipating capacity were obtained. The testing results showed that, the prefabricated integration shear wall (HTCI infilling, PPSCI infilling) failed due to the combined action of bending moment and shear force. Compared to the specimen without infill wall, infilled by masonry and lightweight partition board, the integration shear wall and the shear wall with ceramsite concrete infilling owns better shear bearing capacity, stiffness, energy-dissipating capacity and reliable seismic performance. Finite element (FE) model of all tested specimens were developed by using software OpenSEES, and the precision and utility of these FE models verified by testing data. Using the proposed FE models, an extensive parametric study was performed to investigate the influence factors on the seismic performance of precast fabricated RC shear wall including length of the infill wall, concrete strength, ratio of longitudinal reinforcement in wall limbs and axial compression ratio. Finally, the optimization program of infill wall for the opening of the precast fabricated shear wall are studied based on thickness of polystyrene plate sandwich and setting of steel fabric.