EXPERIMENTAL STUDY OF SHEAR CAPACITY OF π-SHAPE SLAB JOINTS IN PRECAST RC DIAPHRAGM

An experimental study was conducted to evaluate the shear bearing capacity of -shape slab joint connection used in new-type precast concrete floor diaphragm under monotonic and low-cycle loads． Failure process and mode，load-displacement relationship curves，energy dissipation capacity etc of the test specimens were investigated． And the test results showed that the shear bearing capacity of the -shape connection was not ideal because of the weld fracture between anchor bar and steel plate under the said load condition． The hysteretic curves of -shape connection shrank seriously，which showed bad energy dissipation and seismic performance． It is suggested that piercing plug welding should be used to ensure the welding quality between anchor bars and steel plates and to enhance the shear bearing capacity of the -shape slab joints．