Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (4): 1188-1196.doi: 10.13229/j.cnki.jdxbgxb.20230719

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Influence factors of preload loss in cable clamp bolt of suspension bridge based on orthogonal experiment method

Yong-jun ZHOU1,2(),Feng-rui MU2,Cheng CAI3,Fan YANG4   

  1. 1.Large Structures Highway Safety Engineering Research Center of the Ministry of Education，Chang'an University，Xi'an 710064，China
    2.School of Highway，Chang'an University，Xi'an 710064，China
    3.Guangxi Xingang Transportation Investment Co. ，Ltd. ，Qinzhou 535000，China
    4.Shaanxi Provincial Transport Planning Design and Reaseach Institute Co. ，Ltd. ，Xi'an 710065，China
  • Received:2023-07-10 Online:2025-04-01 Published:2025-06-19

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Abstract:

In order to study the influence factors affecting the preload loss of the cable clamp bolt of the suspension bridge and its sensitivity， a local finite element model of the cable clamp in a suspension bridge in Guangxi province was established， and then was verified by the creep test results. Next， 27 finite element models of bolt clamp were set up by using the orthogonal experiment method to study the influence factors on preload loss which include the stress relaxation rate of the bolt， the creep rate of the cable， the porosity of the cable， the suspender force， the initial preload of the bolt， the cable clamp inclination angle and the temperature difference between cable and clamp. The research results show that： the preload loss of the bolts increases with the stress relaxation rate of the bolts. The cable creep rate has a significant impact on the preload loss of the bolts. The preload loss increases significantly with the cable creep rate. The temperature difference between the clamp and the cable has a significant impact on the preload loss of the bolt， the bolt preload loss decreases as the temperature difference increases. The influence of the cable porosity on the preload loss of the bolts is relatively small. The impact of the suspender force on the preload loss of the bolt is negligible. The preload loss of the bolts initially increase and then decrease with the increasing initial preload of the bolts. The influence of the cable clamp inclination angle on the different bolts in the same clamp is unclear. The research conclusions can provide references for the design and maintenance of the suspension bridge cable.

Key words: bridge engineering, bolt preload, orthogonal experiment, stress relaxation, temperature difference, initial preload

CLC Number: 

  • U44

Fig.1

Finite element model of cable clamp"

Fig.2

General layout of bolt creep experiment"

Table1

Material creep parameter"

构 件

初始应力

/MPa

A/10-6nm
螺杆3911.346 60.374 80.282 1
4533.714 10.351 20.256 5
5154.328 40.32530.270 6
主缆850433.280 01.159 00.286 5
1 12070.203 01.034 80.194 3
1 19010.836 01.088 50.148 4

Fig.3

Comparison of stress in bolt and cable between theoretical values and finite element values"

Table 2

Orthogonal experiment influencing factors and levels of bolt preload loss"

因素水平螺杆应力松弛速率①主缆蠕变速率②主缆空隙率/%③吊索力大小/kN④螺杆的初始紧固力/kN⑤索夹倾角/（°）⑥主缆与索夹温差/℃⑦
水平10.80.5161 5004700-2
水平21.00.6181 750620100
水平31.20.7202 000780202

Table 3

Orthogonal experiment cases of bolt preload loss"

工况螺杆应力松弛速率主缆蠕变速率主缆空隙率/%吊索力大小/kN螺杆的初始紧固力/kN索夹倾角/（°）主缆与索夹温差/℃
10.80.5161 5004700-2
20.80.5161 500620100
30.80.5161 500780202
40.80.6181 7504700-2
50.80.6181 750620100
60.80.6181 750780202
70.80.7202 0004700-2
80.80.7202 000620100
90.80.7202 000780202
101.00.5182 000470102
111.00.5182 00062020-2
121.00.5182 00078000
131.00.6201 500470102
141.00.6201 50062020-2
151.00.6201 50078000
161.00.7161 750470102
171.00.7161 75062020-2
181.00.7161 75078000
191.20.5201 750470200
201.20.5201 75062002
211.20.5201 75078010-2
221.20.6162 000470200
231.20.6162 00062002
241.20.6162 00078010-2
251.20.7181 500470200
261.20.7181 50062002
271.20.7181 50078010-2

Fig.4

Schematic diagram of bolt number （unit： mm）"

Fig.5

Preload loss rate under different stress relaxation rate of bolts"

Fig.6

Preload loss rate under different cable creep rate"

Fig.7

Preload loss rate under different cable porosity"

Fig.8

Preload loss rate under different suspender force"

Fig.9

Preload loss rate under different initial preload of bolts"

Fig.10

Preload loss rate under different cable clamp inclination angles"

Fig.11

Preload loss rate under different temperature difference levels"

Fig.12

Sensitivity of influencing factors on preload of bolts 1~4"

Table 4

Sensitivity parameter analysis for bolt preload loss"

因素1号螺杆2号螺杆3号螺杆4号螺杆
螺杆应力松弛速率*************
主缆蠕变速率******************
主缆空隙率********
吊索力大小******
螺杆的初始紧固力************
索夹倾角**********
温差**************
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