Seismic Performance of Prefabricated Shear Walls with Vertical Double-Row Circular Cavity and Simplified Connection

Abstract

This paper proposes a new type of prefabricated shear wall structure with vertical double-row circular cavity and simplified connection, which realizes the function of structure and energy-saving integration. Simplified connection improve construction efficiency compared to traditional connection. Three full-scale specimens are tested under a low-cyclic loading test to study the effect of the structure on seismic performance under different shear span ratios and axial compression ratios. The test results show that the simplified connection between members is safe and reliable. As the shear span ratio decreases from 1.42 to 1.02, the ultimate bearing capacity increased by 50.1%, and the ductility coefficient decreases from 2.90 to 2.41. As the axial compression ratio increases from 0.15 to 0.30, the ultimate load carrying of the specimen increases by 16.8%, and the ductility coefficients decreases from 2.90 to 2.37. When the inter-story displacement angle reaches 1/100~1/50, the structure still has good integrity. The structure has three three-stage failure and damage mechanism that are the overall working stage, the progressive damage stage, and the weak framework stage. To calculate the lateral bearing capacity of the prefabricated shear walls at different stages, a theoretical calculation method based on the softened strut-and-tie model is modified and established. The average errors between the calculated values and the experimental values for the ultimate bearing stage and the weak framework stage are 7.4% and 5.2%, respectively. The accuracy of the calculation model is verified, and provides a reference basis for the application of this structure.

Keywords: Prefabricated RC structure, Seismic performance, Uniform precast panel, Strut-and-tie model, Simplified connection