Seismic Performance of Precast Prestressed Concrete Frame Assembled By Unbonded Tendon With Cast-In-Place RC Slab

Abstract eng:
In this study, the seismic capacity of an ‘unbonded PCaPC’ structure, a precast prestressed concrete frame assembled by post-tensioning unbonded tendons, with cast-in-place RC slabs is investigated. For this purpose, cruciform unbonded PCaPC subassemblages, where the beam flexural failure preceded, were designed, and their reversed cyclic loading tests were carried out. Herein, the main parameter was set to be the partial cut-off of longitudinal bars in the RC slab, which were arranged around the column, since it was considered to affect the damage condition of the slab. From the experiment results, the flexural behavior of unbonded PCaPC beams with RC slabs, including damage patterns, hysteretic characteristics, residual crack opening widths and energy dissipating capacity, is investigated at their positive and negative loading. In addition, some of those test results are compared with the prediction based on a new guideline for seismic performance evaluation of prestressed concrete buildings, recently proposed by the Architectural Institute of Japan. Different limit states of the beam, classified as ‘service limit’, ‘first restorable limit’, ‘second restorable limit’ and ‘safety limit’, which are determined from the damage level of tendons and concrete, as well as from the residual deflection and crack widths, are also discussed based on the guideline.

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