Study on seismic performance of fully dry prestressed assembled column joint
As an efficient fabricated joint,the experimental and numerical study of fully dry prestressed assembled column joint plays an important role in the evaluation of seismic performance of fully dry prestressed assembled frame structure system.The mechanical properties of three prestressed assembled column joints of unbonded prestressed steel bar(UBPC),bonded prestressed steel bar(BPC),longitudinal reinforcement and unbonded prestressed steel bar(RUBPC)under 45°bidirectional bias were studied by quasi-static test.Then,the effects of external axial compression ratio,prestressed axial compression ratio,longitudinal reinforcement ratio and stirrup volume reinforcement ratio on the seismic performance of prestressed assembled column joint were also studied.The results show that the damage of precast columns for BPC and UBPC specimens could be effectively reduced by opening the bonding surface of the column base.And each specimen is basically in an elastic deformation state within the displacement angle limit of 1/100.When the specimen is damaged,prestress loss of RUBPC and UBPC specimens were 25%and 22%respectively,indicating that they have good self-centering characteristics.
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