斜拉桥拉索损伤以及断索对桥梁的影响

发布时间：2018-01-13 21:15

本文关键词：斜拉桥拉索损伤以及断索对桥梁的影响　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着科学技术的发展，斜拉桥也发展迅猛，越来越多的大跨径桥梁被修建和设计，但是桥梁的安全性和耐久性越来越受到重视，本文对斜拉桥拉索的损伤以及断裂对桥梁承载力的影响做了初步的分析，在前人的理论和实践基础上进行完善，探寻某种规律，为桥梁在役时期的监测与维护提供一定的理论基础。目前有关斜拉桥拉索安全性、耐久性问题领域的研究工作主要还停留在斜拉索结构的健康监测方面，而斜拉索使用寿命评估等后期管理维护的研究也有待进一步完善。桥梁钢索的破断，为随机载荷与随机介质及其某些耦合下的腐蚀疲劳、应力腐蚀、机械疲劳、氢脆等的共同行为;非简单的载荷作用，单一的锈蚀所致。总体看来，对斜拉索破断行为的研究还是凤毛麟角，主要是通过对设计阶段的审查、施工阶段的监控以及科学合理的保养方式来控制斜拉索。所以对斜拉桥拉索损伤断裂对桥梁承载力的影响研究很有必要。首先对斜拉桥的发展进行了详细的阐述，分别介绍斜拉桥的结构特点，发展趋势。然后对斜拉索断裂会对全桥造成的影响进行了阐述，对危险性理论也进行了详细的阐述和介绍，尝试提出一些有效的分析思路。在斜拉桥危险性分析成果以及现场检测，实时监测等一系列的成果下，根据查阅的资料对斜拉桥健康监测进行了理论模型的推导；详细阐述了两种因果分析的模型以及其理论方法，并运用集成融合分析了监测系统的组成与实践，构建完整的监测系统。然后运用软件MIDAS CIVIL对某斜拉桥进行建模分析，模拟计算了多种断索组合工况下对主梁、索力等的影响情况，分析不同情况下对索力，，主梁线形，主梁应力的影响，研究不同工况下对结构的敏感程度，罗列出计算成果并归纳总结其规律。根据分析结果提出可行的监测方案和检测方法，其中特别是对主梁挠度、主梁应力以及索力的监测，对今后斜拉桥的监测和维护有一定的参考价值。最后对现行的监测方案及方法进行了介绍及对比，认为不可以单一使用，而应组合成一个系统进行监测，才能达到比较好的效果。对于桥梁的运营状态达到提前预警的目的。
[Abstract]:With the development of science and technology , the cable - stayed bridge also develops rapidly , more and more large - span bridges are built and designed , but the safety and durability of the bridge are more and more important . This paper makes a preliminary analysis on the damage of cable in cable - stayed bridge and the influence of fracture on the bearing capacity of the bridge . At present , the research work in the field of cable safety and durability of cable stayed bridge mainly stays in the aspects of health monitoring of cable structure , and the research on the service life assessment of cable stayed bridge needs to be further improved . The breaking of bridge cable is the common behavior of corrosion fatigue , stress corrosion , mechanical fatigue , hydrogen embrittlement and the like under random load and random medium and some coupling . It appears that the research on breaking behavior of cable stayed cable is very few , mainly through the review of design stage , the monitoring of construction stage and the scientific and reasonable maintenance mode . Firstly , the development of cable - stayed bridge is described in detail , the structural characteristics and development trend of cable - stayed bridge are introduced . Then , the influence of cable - stayed bridge on full - bridge is introduced . The theory model of the health monitoring of cable - stayed bridge is deduced . Based on the analysis results , this paper presents a feasible monitoring scheme and detection method , especially the monitoring and maintenance of main beam deflection , main beam stress and cable force , which can be used in monitoring and maintenance of cable - stayed bridge in the future .

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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