Experimental Study On The Seismic Behavior Of Racfsst Column And Srrac Beam Frame Cross Node

RACFST combines the advantages of concrete and steel tube on the mechanical behavior,and it can solve the problems of building rubbish and aggregate resource shortage.At present,the study of RCFST frame node is still not deep and thorough.The demand for frame joints is getting higher and higher,with the rapid development of high-rise buildings.So it is very important to study this kind of SRRAC beam and RACFST column frame nodes.The present paper set different replacement rate of recycled coarse aggregate,axial compression rate and stiffness ratio of beam to column as the parameters,design eight RACFSST column and SRRAC beam frame nodes with outside reinforcing ring,to study their earthquake resistant behavior through the low cyclic loading test.Simulation analysis was carried out on the specimens through the finite element software ABAQUS to prove the result of the finite element analysis is reliable.And then,extending the finite element analysis.The main conclusions are:All specimens have good seismic behavior.The replacement rate of specimen has little effect on the seismic performance.Within a certain range,the increase of axial compression or rate stiffness ratio of beam to column will improve the bearing capacity of nodes,but it can decrease the ductility of specimens.The result of ABAQUS simulation is in good agreement with the result of test.The extend analysis shows that.the increase of axial compression ratio adds to the disadvantage of the seismic behavior of the joints;the increase of the overhanging length or the thickness of the reinforcement ring is good for the earthquake resistant behavior of the specimens;SRC beam node has better seismic performance than RAC beam node.