TY - JOUR
T1 - Method for Determining Anti-slip Safety Factors Between Main Cable and Saddle in Suspension Bridge
AU - Zhang, Qing Hua
AU - Cheng, Zhen Yu
AU - Jia, Dong Lin
AU - Bao, Yi
N1 - Publisher Copyright:
© 2017, Editorial Department of China Journal of Highway and Transport. All right reserved.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - To precisely evaluate the anti-slip safety between the main cable and the saddle and guarantee the structure safety of multi-pylon suspension bridge, characteristics of the frictional resistance between the main cable and the saddle were investigated. The differential equation between lateral pressure and tension force of strands was established by analyzing the stress-strain relation of micro-body between strands. Meanwhile, a frictional resistance equation between the main cable and the saddle was established based on the lateral pressure expression. The method for determining anti-slip safety factors between the main cable and the saddle was proposed. The frictional resistance equation was validated by results of the model test. Moreover, determination methods of anti-slip safety factor as well as the influence of saddle design parameters on the anti-slip safety factor were discussed. The results indicate that the actual frictional resistance between the main cable and the saddle can be precisely determined by the proposed frictional resistance equation for the saddle with or without vertical friction plate. The existing way of defining anti-slip safety factor with ambiguous physical meaning and conservative values can't consider the influence of optimized saddle parameters on the improvement of anti-slip safety. These problems obstruct the overall design of the multi-pylon suspension bridge. The anti-slip safety factor expression with clearer physical significance is convenient for engineering application and can be taken as the major basis for determining anti-slip safety factor. The coefficients of friction between the main cable and the saddle as well as the saddle design parameters influence the frictional resistance to some extent. It is effective to improve the anti-slip safety through optimal saddle design parameters and the installation of vertical friction plates.
AB - To precisely evaluate the anti-slip safety between the main cable and the saddle and guarantee the structure safety of multi-pylon suspension bridge, characteristics of the frictional resistance between the main cable and the saddle were investigated. The differential equation between lateral pressure and tension force of strands was established by analyzing the stress-strain relation of micro-body between strands. Meanwhile, a frictional resistance equation between the main cable and the saddle was established based on the lateral pressure expression. The method for determining anti-slip safety factors between the main cable and the saddle was proposed. The frictional resistance equation was validated by results of the model test. Moreover, determination methods of anti-slip safety factor as well as the influence of saddle design parameters on the anti-slip safety factor were discussed. The results indicate that the actual frictional resistance between the main cable and the saddle can be precisely determined by the proposed frictional resistance equation for the saddle with or without vertical friction plate. The existing way of defining anti-slip safety factor with ambiguous physical meaning and conservative values can't consider the influence of optimized saddle parameters on the improvement of anti-slip safety. These problems obstruct the overall design of the multi-pylon suspension bridge. The anti-slip safety factor expression with clearer physical significance is convenient for engineering application and can be taken as the major basis for determining anti-slip safety factor. The coefficients of friction between the main cable and the saddle as well as the saddle design parameters influence the frictional resistance to some extent. It is effective to improve the anti-slip safety through optimal saddle design parameters and the installation of vertical friction plates.
KW - Anti-slip safety factor
KW - Bridge engineering
KW - Frictional resistance equation
KW - Multi-pylon suspension bridge
KW - Saddle
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M3 - Article
AN - SCOPUS:85030756388
SN - 1001-7372
VL - 30
SP - 41
EP - 49
JO - Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
JF - Zhongguo Gonglu Xuebao/China Journal of Highway and Transport
IS - 7
ER -