DYNAMIC ANALYSIS OF SIMPLY SUPPORTED BEAMS STRENGTHENED WITH PRETENSION CFRP SHEETS

Abstract

Abstract: The elasticity method was used for analyzing the dynamic characteristics of simply supported beams strengthened with pretension CFRP sheets. The influence of various parameters on characteristics of free vibration of strengthened beams was discussed in detail. Firstly, the strengthened beam was divided into two parts: bare beam and CFRP sheet. The bare beam was studied based on two-dimensional elasticity, and the CFRP sheet was analyzed by the method of string theory. According to the continuity of the displacements and the stresses between the two parts, frequency equation of strengthened beams was obtained. Eigen-frequencies were given by the searching root method of determinant. Excellent consistency of the present solutions and the finite element solutions from the program ANSYS has been observed. The analysis shows that along with the increase of the layers and the pretension force, the reinforcing effect of CFRP on dynamic characteristics of simply supported beams increases.

Key words: beam, CFRP, pretension, strengthening, natural frequency

CLC Number:

TB332

CHEN Feng, ZHOU Ding, LIU Duo, ZHANG Jian-dong. DYNAMIC ANALYSIS OF SIMPLY SUPPORTED BEAMS STRENGTHENED WITH PRETENSION CFRP SHEETS[J]. Fiber Reinforced Plastics/Composites, 2017, 0(5): 5-10.

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