STUDY ON SEISMIC REINFORCEMENT MEASURES AND SCHEMES OF IRREGULAR FRAME STRUCTURES

Abstract

The SAP2000 finite element analysis software was applied to model the original frame and carry out the elasto-plastic time-history analysis method, with an existing irregular plane framework in Tianjin as the object of the study. Buckling-Restrained Brace (BRB) damping and anti-torsional reinforcement scheme was proposed based on the analysis results and the characteristics of the project. The results indicate that compared with the original frame, the period ratio of BRB frame was reduced by 26%; torsional displacement ratio was decreased by 15%; decreasing of inter-story displacement angle could reach 31%, and the maximum displacement angle of the top layer can be controlled within the scope of the code. BRB not only increases the anti-lateral stiffness of the structure, but also improves the seismic performance of the structure, which is an effective approach to control torsional effect of irregular structures.