论文部分内容阅读
吊杆是中承式钢管混凝土拱桥重要的组成部分和受力构件,其可靠程度直接影响结构的使用性和安全性。由于在运营过程中长期受到自然条件和人为因素的影响,拱桥吊杆出现了不同程度的损伤,使其加固工作备受关注。针对更换吊杆法普遍存在的破坏结构局部受力的问题,介绍了一种主动加固吊杆的方法——新增吊杆法。并以玉带桥吊杆加固为工程背景,介绍了新增吊杆的布置及构造,对全桥进行三维数值仿真分析,比较了吊杆加固前后拱肋内力、吊杆内力和拱桥稳定性的变化情况,并通过施工过程控制对新增吊杆内力和桥面线形进行监控。结果表明:新增吊杆法可大幅减小既有吊杆的应力水平,但对拱肋受力和拱桥稳定性影响不大;加固过程中新增吊杆拉力实测值与计算值符合较好,桥面高程变化最大未超过6mm,是一种安全、可行的吊杆加固方法。
The boom is an important part of the CFST arch bridge and the force component, the reliability of which directly affects the usability and safety of the structure. Due to the long-term natural and man-made influences on the operation of the arbor boom, different degrees of damage have occurred in the boom of the arched bridge, making the work of reinforcement hardened. In order to solve the problem of local stress on the damaged structure by changing the boom method, a new method is proposed to increase the boom directly. The jib bridge boom is reinforced to provide the engineering background. The layout and construction of the new boom are introduced. The three-dimensional numerical simulation of the whole bridge is carried out. The changes of the internal force of the arch rib, the internal force of the boom and the stability of the arch bridge are compared Condition, and through the construction process control on the new boom internal force and deck line shape monitoring. The results show that the new boom method can greatly reduce the stress level of the existing boom, but has little effect on the stress of the arch rib and the stability of the arch bridge. The measured value of the newly added boom tension in the reinforcement process is in good agreement with the calculated value , The maximum variation of deck height does not exceed 6mm, which is a safe and feasible method of boom reinforcement.