An analytical model for simulating the bond of prestressed concrete during the prestressed force release

摘要

A bond analytical model is proposed in this paper. The model is capable of reproducing theudbond stress developed between the steel and concrete, in precast prestressed elements, during the entireudprocess of prestressing force release. The bond stress developed in the transmission zone, where the bondudstress is not constant, is also obtained. The steel and concrete stresses as well as the slip between both materialsudcan be also estimated by means of the relation established in the model between these parameters and theudbond stress. The model is validated with the results of a series of tests, considering different steel indentationuddepths and concrete covers and it is extended to evaluate the transmission length. This has been checked byudcomparing the transmission length predicted by the model and one measured experimentally in two series ofudtests.