Research On The Yield Mechanism Of SRC Frames Under Earthquake Action

Fortran program was applied to an elasto-plastic dynamic analysis for SRC frames models with different strength ratios of beam to column. The result of structure integral reactions included story drift, rotation curve, structural member internal force and energy consumption of structure layer element. Then program by ANSYS program finite element analysis was used in an elasto-plastic analysis for structural member sections. According to the data from above analysis, the position and sequence of plastic hinge of structural member could be obtained. In the last part, the analysis of different collapse situation of SRC structure was presented.Parameter D was proposed to reflect strength ratios of beam to column at each layer joint. Through controlling D value, two structure characterized by "strong column-weak beam" and "strong beam-weak column" could be formed. Two different integral collapse mechanism, i.e. beam hinge mechanism and column hinge mechanism respectively will appear when peak earthquake acceleration reaches great value in seismic area. Each structure deformation, structural member internal force and energy dissipated during earthquake during above forming process are studied also. After comparison of those data and discussion on rationality of frame collape at different D values, the best strength ratio of column to beam for SRC is calculated. Considering seismic specifications and taking advantage of SRC structure material property, concrete structure with SRC frame structure during damage process under seismic load is compared, and the excellent seismic performance of SRC frame can be explained.