Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1884-1890.doi: 10.13229/j.cnki.jdxbgxb20180875

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Calculation of natural vibration frequency of simply supported beam strengthened by external prestressing

Chun-ling ZHONG1(),Dong LIANG2,Yun-long ZHANG3,Jing WANG3()   

  1. 1. College of Economics and Management,Jilin Jianzhu University,Changchun 130118,China
    2. College of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China
    3. College of Transportation Science and Engineering,Jilin Jianzhu University,Changchun 130118,China
  • Received:2018-07-25 Online:2019-11-01 Published:2019-11-08
  • Contact: Jing WANG E-mail:420519613@qq.com;wangjing0062@sina.com

Abstract:

In order to explore the internal mechanism of the natural vibration frequency of externally prestressed simply supported beams, the calculation formula of the natural vibration frequency of externally prestressed simply supported beams with eccentric linear reinforcement is derived based on the basic principle of structural vibration and the Hamilton principle. The finite element model is established in ANSYS and its modal analysis is carried out. The analysis results show that the calculation of the natural vibration frequency of the externally prestressed simply supported beam for the eccentric linear reinforcement is reliable according to the calculation theory given in this paper. It provides a new calculation method for the calculation of the natural vibration frequency of externally prestressed simply supported beams, and it is of great significance to reveal the variation law of the natural vibration frequency of externally prestressed simply supported beams.

Key words: bridge engineering, simply supported beam, external prestress, natural frequency

CLC Number: 

  • U441

Fig.1

Eccentric linear prestressed simplysupported beam"

Fig.2

ANSYS model"

Table 1

Comparison of vertical self-vibrationfrequency"

频率 解析解/Hz ANSYS解/Hz 误差/%
一阶 6.7947 6.739 0.82
二阶 27.1786 24.301 10.59

Fig.3

First order mode"

Fig.4

Second-order mode"

Fig.5

Natural vibration frequency under differenteccentric distances"

Fig.6

Natural vibration frequency under differentreinforcement ratios"

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