Experimental study on seismic behavior of novel prefabricated prestressed concrete frame beam-to-column joints
The novel prefabricated prestressed concrete frame structure realizes the connection of beam-to-column joints through the pre-compress generated by post-tensioned prestressed steel strands and prestressed twisted steel bars.In order to study the seismic behavior of this joint,the pseudo static test is carried out on four specimens to examine the failure modes,hysteretic characteristics,stiffness degradation,displacement ductility,bearing capacity and energy dissipation capacity,and the influences of shear span ratio and section prestress on its seismic performance are also discussed.A calculation method for the bending bearing capacity of the connection is established.The test results indicate that all specimens have bending failure at the beam end.The hysteresis curve is inverted"S-shaped"or plump with"bow-shaped".The displacement ductility coefficients are greater than 3 and the strength yield ratio of each specimen is between 1.07 and 1.33,which show that the specimens have excellent energy consumption ability and deformability.The shear span ratio has no obvious effect on the seismic behavior of the joints.The distribution of section prestress has a certain influence on the seismic behavior of the joints.When the connection is under uniform prestress,the comprehensive seismic performance such as energy dissipation capacity and displacement ductility is relatively optimal.
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