Seismic performance evaluation of prefabricated concrete shear walls with anchorage defects

Abstract

In this study, the effects of grouting sleeve anchorage defects on the seismic performance of prefabricated concrete shear walls were studied, and a fast after-damage retrofitting method has been proposed. Six specimens were investigated under cyclic loading. The parameter was the number of grouting sleeve anchorage defects, selected as 0, 2, and 4. The test was divided into two loading stages. During stage 1, the specimen was loaded until the strength dropped below 85 % of its peak strength. After stage 1, the damaged specimens were retrofitted using combined retrofitting method of steel plate and high-strength grouting material, and then subjected to loading tests in stage 2. The resulting damage characteristics, hysteretic behavior, stiffness, strength, and energy dissipation capacity were studied. The strength of the shear wall, considering anchorage defects, was calculated. The results show that anchorage defects reduce the seismic behavior of the specimens. Compared with the two defects, the strength of the shear wall with four defects did not significantly change, though the ductility coefficient and energy dissipation capacity decreased considerably. The combined steel plate-high strength grout retrofitting method could significantly improve the strength and energy dissipation and effectively restore the stiffness of prefabricated shear walls. The calculated strength of the shear wall is in good agreement with the experimental value, confirming that it is reliable and can be used to calculate the strength with anchorage defects. The proposed retrofitting method can provide a new choice for the fast damage repair of the post-earthquake shear walls.