悬索桥主缆与鞍座抗滑移安全系数的确定方法

发布时间：2018-05-20 03:39

本文选题：桥梁工程 + 多塔悬索桥　；参考：《中国公路学报》2017年07期

【摘要】：为准确评估主缆与鞍座间的抗滑移安全性,确保多塔悬索桥结构受力安全,对主缆与鞍座间的摩擦抗力特性进行了研究。通过分析索股间微元体的应力-应变关系,建立侧向压力和索股拉力间的微分方程,推导了主缆索股和鞍座侧壁接触面间的侧向压力表达式,并据此建立了主缆与鞍座间的摩擦抗力方程,提出了悬索桥主缆与鞍座之间的抗滑移安全系数确定方法。通过模型试验结果对摩擦抗力方程进行了验证,并对主缆与鞍座抗滑移安全系数的确定方法以及鞍座设计参数对于抗滑移安全系数的影响进行了探讨。结果表明:所提出的摩擦抗力方程能够准确确定鞍槽内设置和不设置竖向摩擦板2种典型情况下主缆与鞍座间的实际摩擦抗力;现有的抗滑移安全系数定义方法物理含义模糊,计算值偏于保守,无法计入鞍座参数优化对提高抗滑移安全性的影响,可能对多塔悬索桥的结构设计造成困扰;所提出的抗滑移安全系数表达式,物理意义明确,便于工程应用,可以作为确定抗滑移安全系数的依据;主缆与鞍槽接触面间的摩擦因数和鞍座结构设计参数是主缆与鞍座间摩擦抗力的重要影响因素,改善鞍座设计参数和设置竖向摩擦板是提高主缆与鞍座抗滑移安全性的有效途径。
[Abstract]:In order to accurately evaluate the anti-slip safety between main cable and saddle and to ensure the safety of multi-tower suspension bridge, the friction resistance characteristics between main cable and saddle are studied. By analyzing the stress-strain relationship between cables and strands, the differential equations between lateral pressure and cable tension are established, and the expressions of lateral pressure between the main cable strands and the side wall of saddle are derived. The friction resistance equation between the main cable and the saddle is established, and the method of determining the anti-slip safety factor between the main cable and the saddle of the suspension bridge is put forward. The friction resistance equation is verified by the model test results, and the method of determining the anti-slip safety factor of the main cable and saddle and the influence of the saddle design parameters on the anti-slip safety factor are discussed. The results show that the proposed friction resistance equation can accurately determine the actual friction resistance between the main cable and the saddle under two typical conditions, that is, the vertical friction plate is installed in the saddle, and the physical meaning of the existing methods for defining the safety factor of anti-slip is vague. The calculation value is conservative, which can not take into account the influence of saddle parameter optimization on improving the anti-slip safety, which may cause trouble to the structural design of multi-tower suspension bridge, and the expression of anti-slip safety factor presented in this paper has a clear physical meaning. The friction coefficient between the main cable and the saddle groove and the design parameters of the saddle structure are the important factors affecting the friction resistance between the main cable and the saddle. Improving the design parameters of saddle and setting vertical friction plate is an effective way to improve the anti-slip safety of main cable and saddle.
【作者单位】：西南交通大学桥梁工程系;密苏里科技大学土木建筑与环境工程系;
【基金】：国家自然科学基金项目(51578455,51378431,51178394) “十二五”国家科技支撑计划项目(2011BAG07B03) 中央高校基本科研业务费专项资金项目(2682014CX078)
【分类号】：U448.25

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