LONG-TERM DEFLECTION CONTROL IN CANTILEVER - PRESTRESSED CONCRETE BRIDGES .2. EXPERIMENTAL-VERIFICATION

This paper continues the preceding study on the long-term deflection c ontrol of prestressed concrete bridges. In this paper, an experimental study is first presented. The objectives of the experimental program are to check the accuracy of the constitutive modeling for time-depend ent analysis of prestressed concrete bridge need in this study and to verify the concept of the proposed deflection control method. Experime ntal results indicate that the constitutive model and numerical analys is can be used to predict the long-term behavior of prestressed concre te structures, and the realistic feasibility of the deflection control method is verified. A numerical simulation is then carried out on the prediction of a segmentally constructed cantilever prestressed concre te bridge. Numerical results show that the proposed deflection control method is practically feasible to control the long-term deflection of the bridge and to increase the span of a prestressed concrete bridge.