Response of Prestressed Concrete Plate-Edge Column Connections

248 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982.The main objective of this investigation was to study experimentally the strength and behavior of prestressed plate-edge column connections with unbonded tendons representative of those used in prestressed flat plate buildings. To achieve the objective, four two-thirds scale, flat plate-edge column specimens were constructed and subjected to static loadings in which both the shear and moment transferred between the slab and the column were increased proportionately until failure occurred. The specimens were models of the edge column and the surrounding slab area located within the negative moment area around the edge column. The experimental variables considered in this program were the direction of the banded tendons and the moment-shear ratio.Three analytical models for predicting the strength of prestressed concrete flat plate-edge column connections were used to analyze the behavior of the four specimens tested in this investigation and of several specimens tested by other investigators. Although the actual stresses were higher than predicted in the bonded steel and lower than predicted in the tendons, the model recommended by ACI was reasonably accurate. The accuracy of the beam analogy proposed in this investigation indicates that this model can be used as a practical design method for calculating the strength of prestressed concrete slab-edge column connections transferring moments and shears. The yield line theory provides a convenient method for evaluating the ultimate flexural strength of prestressed flat plate floors.The problems associated with predicting the tendon stress were discussed and several models for predicting the tendon stress were presented and evaluated with respect to the measured values. The modified Tam and Pannell method was the best predictor of the tendon stress increase, and it may be very useful for the design of prestressed concrete slabs.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD