Full-Scale Test and Finite Element Analysis of Thick Plate Anchorage Zone with Multiple Blocks

In order to investigate the stress distribution characteristics of the prestressed concrete thick plate anchorage zone with multiple blocks, a full-scale test was carried out on the anchorage zone of the longest cantilever beam in the staircase of Shanghai Grand Opera House. The stress development of the reinforcement and concrete at the location of the tensile stress concentration was obtained by tensioning the prestressed tendons in batches of each block. The finite element model was established and the parameters were analyzed. The force flow characteristics and the influence of various factors on the local action effect in the anchorage zone were obtained. The results of test and finite element calculation showed that the local bending effect was not obvious in the thick plate anchorage zone, and only the last anchor block had the tie-back tension effect. The bursting effect, root tension effect and deviation force effect of each anchor block were independent of each other. The stress of the stirrups resisting horizontal shear in the plate accumulated with the tension of the prestressed tendons of each anchor block. The tensile stress flow caused by the bursting effect in the thick plate anchorage zone was mainly distributed in the tension end to the half of the block length. And there was a bifurcation phenomenon of the tie-back tension effect force. The tie-back effect and root tension effect decrease with the increase of the angle of the block. The local bending effect increased with the decrease of the plate thickness and the increase of the distance from the block to the front end of the plate.