Experimental study on seismic performance of full-scale fabricated concrete frame with special-shaped columns

In order to study the seismic performance of the new residence with assembled concrete special-shaped column frame structure, a two-story and two-span full scale test model was designed and constructed to carry out the cyclic loading experimental test. On the basis of experimental study, a simple method of static elastoplastic analysis for the frame structure of concrete special-shaped columns was established based on in-situ equivalent substitution and the modified section characteristics. The results show that it is safe and reliable to adopt the scheme of grouted connection and the post-cast beam-column joint in the frame structure of assembled special-shaped concrete columns, and the ultimate failure of the model is characterized by the failure of the strong column and the weak beam. The limiting displacement drifts of the first and second floor are 1/25 and 1/48, respectively, which are both larger than the standard limits and meet the requirements of no collapsing with strong earthquake seismic fortification. The test model has a good bearing capacity for deformation and energy consumption, and the ductility coefficient corresponding to the overall structure is 4.83, which meets the ductility framework requirements. The middle cross joint is in the shape of X shear crack and is seriously damaged, and so necessary measures should be taken to strengthen it. The research results provide a reference for the extension and application of the frame structure of assembled concrete special-shaped columns in the new residence, and it is suggested that the limit value of elastic interlayer drift should be relaxed moderately. © 2021, Central South University Press. All right reserved.