横向联系加固方式对桥梁结构力学性能的影响研究

发布时间：2018-06-17 22:58

本文选题：简支T梁 + 横向加固　；参考：《兰州交通大学》2017年硕士论文

【摘要】：横向联系是桥梁的重要构件,在提高桥梁整体刚度、保持桥梁完整性与稳定性方面发挥着至关重要的作用。桥梁结构的横向刚度和整体性会随着横向联系的失效而降低,同时不同梁体之间的协同工作受到破坏,桥梁在横向不再形成一个整体。横向联系完全破坏或失去作用时会出现“单梁受力”的情况,给桥梁安全造成很大影响。本文通过对公路多片式及铁路双片式简支梁桥的结构特点和动静力特性进行研究分析,提出了多种针对横向联系进行加固的有效方案。分别计算多片式公路及双片式铁路简支梁桥的动静力特性以及其随着不同加固方法的变化情况,从而得到横向联系在不同加固方法下对桥梁结构动静力行为的影响规律。论文主要工作如下:首先,以公路多片式简支梁桥为研究对象,按照对于横向联系的不同加固方案,利用有限元分析软件ANSYS建立分析模型,对结构的动力特性进行计算分析。横向联系加固主要通过:1)在原有横隔板上粘贴型钢及钢板、2)在梁体之间增加钢横撑、3)在梁体之间施加横向预应力、4)在梁体之间增加钢横隔板等四种方法。其次,介绍了公路多片式简支梁桥荷载横向分布的基本理论,并对荷载横向分布系数的计算公式运用模态参数法进行了推导。在此基础上,依据ANSYS模态分析所得到的数据结果,利用得到的荷载横向分布系数计算公式,计算原结构及采用不同加固方法加固后结构的荷载横向分布系数,得到其分布变化规律。最后,以铁路双片式简支梁桥为研究对象,对梁体的空间振动特性进行分析。按增加的横系梁在梁体的不同位置和预紧钢筋预紧力的不同参数值分别建立分析模型,研究其对梁体自振频率的影响。由自振频率的变化来分析和确定横系梁和预紧钢筋的具体设置形式对桥梁结构横、竖向刚度的作用,确定合理的加固形式。研究结果表明,对于公路多片式简支梁桥横向联系的加固,采用增加钢横撑和增加钢横隔板方法,梁体横向刚度明显提高,竖向刚度降低较少,同时荷载横向分布系数分布也较为均匀,加固效果明显;对于铁路双片式简支梁桥,采用方案一进行加固,在较大幅度提高其横向刚度的同时,竖向刚度降低较少,加固效果明显。本文所提出的横向联系加固方法及其确定思路可以作为在设计同类桥梁横向加固方案时参考及借鉴。
[Abstract]:Transverse connection is an important component of bridge, which plays an important role in improving the overall stiffness of the bridge and maintaining the integrity and stability of the bridge. The transverse stiffness and integrity of the bridge structure will decrease with the failure of the transverse connection, and the cooperative work between different beams will be destroyed, so the bridge will no longer form a whole in the transverse direction. The "single beam force" will occur when the transverse connection is destroyed or lost, which has a great impact on the safety of the bridge. In this paper, the structural characteristics and dynamic characteristics of multi-piece highway and railway double-piece simply supported beam bridges are studied and analyzed, and several effective schemes for strengthening transverse connections are put forward. The dynamic and dynamic characteristics of multi-piece highway and double-piece railway simply supported beam bridge are calculated, and the dynamic and dynamic behaviors of bridge structure under different reinforcement methods are obtained. The main work of this paper is as follows: firstly, the multi-piece simply supported bridge of highway is taken as the research object. According to the different reinforcement schemes for the transverse connection, the finite element analysis software ANSYS is used to establish the analysis model to calculate and analyze the dynamic characteristics of the structure. Transverse connection strengthening is mainly done by means of: 1) adding steel bar and steel plate 2) adding steel transverse bracing 3) adding transverse prestressing force between beams 4) adding steel cross diaphragm between beams. Secondly, the basic theory of lateral load distribution of highway multi-piece simply supported beam bridge is introduced, and the calculation formula of load transverse distribution coefficient is deduced by modal parameter method. On this basis, according to the data obtained from ANSYS modal analysis, the transverse load distribution coefficient of the original structure and the strengthened structure with different reinforcement methods is calculated by using the calculated formula of load transverse distribution coefficient. The law of its distribution variation is obtained. Finally, the spatial vibration characteristics of the beam body are analyzed by taking the railway double-sheet simply supported beam bridge as the research object. According to the different position of the increased transverse beam in the beam and the different parameter values of the pretension force of the prestressing bar, the analysis model is established, and the influence of the model on the natural vibration frequency of the beam is studied. According to the change of natural vibration frequency, the effect of the concrete setting form of the transverse beam and the prestressing bar on the transverse and vertical stiffness of the bridge structure is analyzed and determined, and the reasonable reinforcement form is determined. The results show that the transverse stiffness of the beam body is obviously increased and the vertical stiffness is reduced less by increasing the steel transverse bracing and increasing the steel transverse partition for the reinforcement of the transverse connection of the highway multi-piece simply supported beam bridge, and the results show that the transverse stiffness of the beam is obviously increased, and the vertical stiffness is reduced less. At the same time, the distribution of transverse load distribution coefficient is also more uniform, and the reinforcement effect is obvious. The reinforcement effect is obvious. The method of transverse connection reinforcement and its determination can be used for reference in the design of similar bridge transverse reinforcement scheme.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441;U445.72

【参考文献】