Experimental evaluation on the prediction of long-term loss of prestressed concrete

Recently, the construction trend is to build larger and slender structures all over the world. In order to construct the required structures, prestressed concrete (PSC) construction method is an only viable option, which requires an evaluation of prestress tendons. Recently, many researches were performed on the evaluation for PS tendons. Implementation of the PS tendons is done to precisely understand prestress loss along the full length of PS tendons. Therefore, in this paper, long-term loss in normal and high strength tendons were measured experimentally. To evaluate the long-term loss of prestressed concrete members, long-term loss tests were carried out on 18 m PSC girder specimens. PS tendons used in the specimens were two types of steel strand. SWPC 7B (Type B) is a strand with tensile strength of 1,860 MPa, while SWPC 7D (Type D) is a strand with tensile strength of 2,400 MPa. The PS loss data were measured of two years. The experimental results can be used as basic research references to formulate constitutive models of PS tendons, which can be used to calibrate simulation tools of full-scale PSC structural behavior.