TESTS OF SEISMIC BEHAVIOR OF REINFORCED CONCRETE FRAMES WITH INFILLED WALL OR STRENGTHENED INFILLED WALL

Through cyclic loading tests,it is researched the seismic behavior of one simple frame specimen,four brick infilled frame specimens and seven frame specimens infilled with brick walls strengthened with steel-meshed cement mortar or carbon fiber sheet.All of these specimens are one-storey one-span reinforced concrete frames.Failure process,failure modes,load carrying capacity,ultimate deformation,hysteretic curves,skeleton curves,ductility,energy-dissipation capacity and strain of carbon fiber sheet are compared among these specimens.Test results show that shear failure always happens for infilled frames and strengthened infilled frames,and this is very different with flexural failure at column bottoms and beam ends for simple frames;the load carrying capacity of infilled frames is much higher than simple frames,and it can be increased by strengthening the infilled walls with steel-meshed cement mortar or X-shaped carbon fiber sheet,but the strengthening with horizontal carbon fiber sheet has no distinct effect on the load carrying capacity of the infilled frames.The ultimate deformation of infilled frames is much less than simple frames,and the ultimate interstory deformation of infilled frames can reach 1/50,but the ultimate interstory deformation of strengthened infilled frame can only reach 1/80.