铁路预应力混凝土系杆拱桥受力分析

发布时间：2019-06-21 03:44

【摘要】：系杆拱桥的结构合理、跨越能力大、造型美观,由于系杆承担着拱脚处的水平推力,突破了一般拱桥对于墩、台、地基要求高的限制,在目前高速发展的铁路上应用前景广泛。本文以主跨跨径64m的单线铁路预应力混凝土系杆拱桥SYL桥为背景,对其整体的变形和受力状态、局部的受力状态以及稳定性进行了全面研究,主要完成工作有以下几点：1、建立了全桥空间有限元模型,对桥梁施工阶段的受力情况进行了分析计算,得出各个施工阶段中桥梁各构件的受力状态良好,满足规范要求。2、对桥梁在在恒载、最不利活载、附加力及荷载组合作用下的变形和受力性能进行了研究。结果表明：该桥总体受力合理,刚度、强度满足要求且有一定富余3、考虑构造细节建立拱脚局部精细有限元模型,对其在各种工况下的受力性能进行研究。得出其存在一定的应力集中现象,对设计提出了改进的建议。4、对桥梁下部结构和横向环框的受力情况进行了分析,结果表明受力状态良好,满足规范要求。5、对该桥在成桥状态有车、无车时的整体稳定性进行了研究。结果表明：列车对桥梁的稳定性影响较大,横向风荷载影响相对较小；低阶失稳模态均由纵向平联面外失稳控制,整体失稳在高阶才会出现；成桥状态有车、无车时稳定安全系数都在9.0以上,桥梁整体稳定性能较好。本文的分析方法和研究成果为SYL桥设计提供了依据,也为同类系杆拱桥为此类桥梁的设计提供参考。
[Abstract]:The structure of tied arch bridge is reasonable, the span ability is large, and the shape is beautiful. Because the tied bar bears the horizontal thrust at the arch foot, it breaks through the high requirement limit of pier, platform and foundation of general arch bridge, and has a wide application prospect in the high speed development railway at present. In this paper, based on the SYL bridge of single-track prestressed concrete tied arch bridge with main span of 64m, the overall deformation, stress state, local stress state and stability of the bridge are studied comprehensively. The main work is as follows: 1. The spatial finite element model of the whole bridge is established, and the stress condition of the bridge in the construction stage is analyzed and calculated, and it is concluded that the stress state of each component of the bridge in each construction stage is good. To meet the requirements of the code. 2, the deformation and mechanical properties of the bridge under the action of dead load, the most unfavorable live load, additional force and load combination are studied. The results show that the overall force of the bridge is reasonable, the stiffness and strength meet the requirements and have a certain surplus 3. Considering the structural details, the local fine finite element model of arch foot is established, and the mechanical properties of the bridge under various working conditions are studied. It is concluded that there is a certain stress concentration phenomenon, and some suggestions for improvement of the design are put forward. 4. The stress of the lower structure of the bridge and the transverse ring frame are analyzed. The results show that the stress state is good and meet the requirements of the code. 5. The overall stability of the bridge when there is a vehicle and no vehicle is studied. The results show that the train has a great influence on the stability of the bridge, and the transverse wind load has relatively little effect on the stability of the bridge. The low-order instability mode is controlled by the external instability of the longitudinal parallel plane, and the overall instability will occur at the higher order. The stability safety factor of the bridge is above 9.0 when there is a vehicle in the bridge state, and the overall stability performance of the bridge is better. The analysis method and research results of this paper provide the basis for the design of SYL bridge, and also provide a reference for the design of this kind of bridge for the same kind of tied arch bridge.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.225

【相似文献】