The numerical investigation of performance of the connection between the steel braces and RC frames

There are many concrete building without enough resistant against earthquick that need to seismic retrofitte. Using steel bracing is an usual way to seismic retrofitting in current years. For the suitable performance in this method , the connection between steel bracing system and concrete frames is very important. In recent years some experimental researches is done in this field and several method is recommended for connection. For determinating the suitable connection , in this research 4 RC frames retrofitted by using steel bracing system with 4 details in connection and 1 RC frame without bracing is modeled by using the finite elements method in Abaqus software. the strength of connection 's elements , stiffness of system and cracking in RC frames are investigated and compared in every model.
Results show that the connection between brace and RC frame by bolt to beam and column , also by steel jacket which fixed to column have suitable performance and other types of connection haven't required performance