系杆拱桥吊杆的破损-安全设计研究

发布时间：2018-02-03 08:06

本文关键词： 中承式系杆拱桥吊杆破损安全设计平行双吊杆体系吊杆骤断吊杆疲劳寿命　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：现阶段由于吊杆失效造成的桥梁损坏事故时有发生,而拱桥吊杆在设计、施工、维护、健康诊断、修复拆换以及剩余寿命预测等各方面的规定不是非常明确,而且吊杆的健康诊断工作难以满足桥梁可靠性要求,导致桥梁事故仍不断发生。为此,本课题在参考和总结已有研究成果的基础上,以一座柔性系杆刚性拱桥实例为研究背景,对吊杆的载荷行为及其破损安全设计方法进行研究分析。本文在总结我国系杆拱桥吊杆破损原因及其处置方法基础上,阐述了吊杆疲劳所涉及的结构破损安全设计理论和分析方法,然后对于系杆拱桥结构中采用的普通双吊杆单元进行设计改进,应用线性累积损伤理论,结合破损安全设计方法,研究了某大桥双吊杆破损安全单元。所谓的系杆拱桥吊杆破损安全设计是指系杆拱桥的双吊杆在桥梁使用寿命期内允许某一根吊杆骤然破断但剩余的另外一根吊杆能够保证桥梁整体结构在修复破断吊杆之前的安全,并尽可能保证在修复破断拉索期间的交通不受影响。论文分析计算了改进后吊杆的疲劳设计寿命,分析个别吊杆骤断对剩余桥梁结构的冲击作用,研究认为改进后双吊杆体系的全桥安全性要高于原先设计的普通双吊杆以及单吊杆体系,论证了吊杆破损安全设计理论的有效性。本文研究的破损安全吊杆系统为确保系杆拱桥的吊杆突然断裂时,桥梁剩余结构能承受其骤断带来的冲击作用,使结构能正常运行以及拆换新的吊杆。本文中得到的结论为拱桥设计人员在系杆拱桥吊杆破损安全设计方面提供了一定的参考价值。
[Abstract]:At present, the bridge damage accidents caused by the failure of the suspenders occur from time to time, but the provisions of the arch bridge suspenders in the design, construction, maintenance, health diagnosis, repair and replacement, and prediction of the remaining life are not very clear. Moreover, the health diagnosis of suspenders is difficult to meet the reliability requirements of bridges, which leads to the continuous occurrence of bridge accidents. Therefore, based on the reference and summary of the existing research results, this paper takes an example of flexible tied rigid arch bridge as the research background. The load behavior and damage safety design method of suspenders are studied and analyzed in this paper. On the basis of summing up the reasons for the damage of suspenders of tied arch bridges in China and the methods to deal with them, This paper expounds the design theory and analysis method of structural damage safety related to the fatigue of suspenders, and then improves the design of the common double suspenders used in the structure of tied arch bridge, applies the linear cumulative damage theory, and combines the damage safety design method. The damage safety unit of double suspenders of a certain bridge is studied. The so-called safety design of suspension rod of tied arch bridge means that the double suspender of tied arch bridge allows one of the suspenders to break suddenly during the service life of the bridge, but another suspension is left behind. The bar can ensure the safety of the whole structure of the bridge before repairing the broken suspender. As far as possible, the traffic will not be affected during the repair of broken cables. This paper analyzes and calculates the fatigue design life of the improved suspenders, and analyzes the impact of sudden breakage of individual suspenders on the remaining bridge structures. It is considered that the safety of the improved double suspension system is higher than that of the conventional double suspension system and the single suspender system. This paper demonstrates the validity of the theory of the safety design of the suspenders. In order to ensure the sudden rupture of the suspenders of the tied arch bridge, the residual structure of the bridge can withstand the impact brought by the sudden breakage of the suspenders. The conclusion obtained in this paper provides a certain reference value for the designers of arch bridge to design the damaged safety of the suspenders of tied arch bridge.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.225

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