A Dynamic Test of Fully Prestressed Concrete Beams
A dynamic test of two unbonded fully prestressed concrete beams has been conducted. The results indicate that the natural frequency of beams increases with the prestress force, which is opposite to the analytical arguments for homogeneous and isotropic beams subject to axial force. This paper explains the change in frequencies by discussing the change in the elastic modulus. A modified formula is also proposed, and the experimental data agree well with the theoretical analysis.
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
Y. T. Zhang et al., "A Dynamic Test of Fully Prestressed Concrete Beams", Advanced Materials Research, Vols. 368-373, pp. 2483-2490, 2012