SHEAR STRENGTH CAPACITY OF PRESTRESSED CONCRETE BEAMCOLUMNJOINT FOCUSING ON TENDON ANCHORAGE LOCATION

摘要

In order to estimate shear strength capacity and overall seismic behavior of prestressed beam-column jointassemblages, seven test units were constructed and tested under earthquake-simulating cyclic loads. Themain experimental parameters were location of tendon anchorage, concrete compressive strength andprestressing steel content in the beam section. A reinforced concrete beam-column joint assemblagewhose beam section has as large a moment capacity as the prestressed concrete test units was included inthe test program. The test units failed in shear and tendon anchorage deteriorated in the joint core. Loadcarrying capacity, ultimate displacement, hysteretic energy, joint shear distortion were obtained anddiscussed. The joint shear strength of the test units were compared with those obtained by codespecifications, such as the AIJ guidelines [1] and New Zealand concrete design code NZS3101. It shouldbe noted that location of tendon anchorage had a great influence on shear capacity of the joint and loaddisplacementrelation of the assemblages. The prestress on the joints was not so effective as the NZS3101code specifies.