Study on the Stiffness and Deformation Performance of Self-Compacting Concrete Prestressed Beams with Mechanized Sand

Abstract

There are more studies on self-compacting concrete but less on self-compacting prestressed concrete members using mechanism sand. In this paper, the stiffness and deformation performance of the test members are investigated by observing the mid-span deflection and concrete strains in different cross-sections during and after the tensioning process of 19.2-m mechanism sand self-compacting prestressed concrete beams. The test observation results are processed, and the member deflection is calculated according to the Code JTG D62-2004. Then the deflection is calculated by regressing the curvature curve of the secondary beam section through the concrete strain observations of different sections. Then the finite element model simulation is carried out to calculate the mid-span invert arch value after the tensioning process. The results are in good agreement with the actual test. Finally, the four results were compared according to the actual measured deflection values of the test. Finally, it is concluded that there are some differences between the short-term deflection calculation of the mechanism and self-compacting prestressed members using the "JTG D62-2004" and the measured results, but still can meet the design requirements the mechanism sand self-compacting prestressed members.