Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (5): 1756-1762.doi: 10.13229/j.cnki.jdxbgxb20200534

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Calculation method of buffeting response for stay cables of long⁃span cable⁃stayed bridge

Shu-lun GUO1(),Tie-yi ZHONG1(),Zhi-gang YAN2   

  1. 1.School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China
    2.Engineering Management Center，China Railway Corporation，Beijing 100038，China
  • Received:2020-07-16 Online:2021-09-01 Published:2021-09-16
  • Contact: Tie-yi ZHONG E-mail:821949121@qq.com;tyzhong2008@163.com

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Abstract:

In order to improve the buffeting response calculation method for cables of long-span cable-stayed bridge， the shortcomings of bridge buffeting response spectrum method are analyzed. Based on bridge buffeting response spectrum method， the aerodynamic damping calculating formula suits for cables in long-span cable-stayed bridge is given， and the approximate formula for the cable buffeting response root mean square along-wind in long-span cable-stayed bridge is proposed. The applicability of the approximate formula is analyzed. The results show that the approximate formula has a good accuracy when the wind speed is higher than 40m/s， meanwhile the sag parameter is between 0.76 and 2.29. The root mean square of cable buffeting response along-wind can be calculated conveniently by this formula， which can provide buffeting response study and engineering analysis with an effective method.

Key words: bridge engineering, long-span cable-stayed bridge, aerodynamic damping, stay cable, buffeting response

CLC Number: 

  • U441

Fig.1

Overall elevation of bridge"

Fig.2

Simulating self-excited force by MATRIX27 element"

Table 1

Parameters of cables"

索号索长/m单位长度质量/kg直径/mλs2
S1136.522131.50.185 520.01
S10231.31696.90.185 520.24
S20359.128131.50.176 340.76
S30493.621145.00.152 121.83
S36576.193145.00.176 342.29

Fig.3

Buffeting response time history of cables"

Fig.4

Buffeting response RMS of cables"

Fig.5

Error change on sag parameter and wind speed"

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