可应急使用的快速装配式钢—砼组合桥梁关键构造研究

发布时间：2018-01-17 01:08

本文关键词：可应急使用的快速装配式钢—砼组合桥梁关键构造研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：桥梁由于自然灾害、结构病害或超载等各种原因的桥梁垮塌断裂等事故常有发生。由于桥梁通常为道路重要节点，桥梁中断将极大的影响灾害救援、人车出行等，应急临时保通桥梁应运而生。传统应急桥梁（“321”贝雷钢桥）搭建方便快捷，然而其仅可作为应急临时桥，后期需要拆除重建新桥，带来交通中断或再选桥位等其它问题。本文依托重庆市交通科学技术项目“快速装配式应急桥梁及其转化为永久桥梁的技术研究”，提出了可应急使用的快速装配式钢砼组合桥梁，对其构造、设计及施工方法等进行了研究，主要研究内容及成果如下： ①可应急使用的快速装配式钢－砼组合桥梁主梁为预制砼桥面板－钢主梁组合结构，既可较短时间内恢复交通，确保救灾、出行等应急需求，又可避免应急桥梁与长期桥梁的重复建设，方便快捷的实现应急桥到长期桥的转化，有利于资源节约和环境保护。 ②快速装配式钢－砼组合桥梁在应急修建时可根据应急桥桥面板材料分为钢桥面板应急桥梁与混凝土桥面板应急桥梁，钢桥面板方案较混凝土桥面板方案施工速度更快，架设更方便，而转化至长期桥梁时混凝土桥面板方案更为方便快捷。通过对两种方案全过程受力分析，验证了其可行性。 ③可应急使用的快速装配式钢－砼组合桥梁在应急桥和长期桥阶段时主梁结构、设计荷载、强度刚度要求等各方面均有不同要求，本文对其设计方法进行了研究。基于结构优化理论，以材料费用最少为目标函数，，建立以主梁钢与砼应力控制为条件方程，在组合梁截面特性计算中采用合理假定和简化，提出钢－砼组合梁设计优化方法并通过matlab完成程序实现。该优化计算程序可根据桥跨、桥宽、荷载要求等参数快速计算出主梁数量、截面型式及尺寸等主要参数推荐值。 ④针对可应急使用的快速装配式钢-砼组合桥梁构造及施工要求，采用钢桁架横联构造，利用有限元Abaqus建立精细化实体模型分析钢桁架力学行为并进行构造设计。横联采用上下弦不对称设计，在钢桁架横联上弦杆顶部设置具有承托桥面板边缘作用的承托钢板，减小桥面板缝隙两侧在车轮荷载作用下的位移差值。分析表明设置承托钢板比不设置承托钢板的桥面板位移差值减小21.23%~54.45%。 ⑤通过采用MIDAS对桥梁横向分布性能进行参数分析，将梁格空间有限元计算结果与传统方法结果进行对比分析。提出通过修正计算桥面板厚度的方法得到的适用于类似工字钢混凝土桥面板组合结构桥梁的修正铰接板（梁）法。比较表明，修正铰接板（梁）法计算结果与梁格空间有限元结果吻合较好。
[Abstract]:Bridge collapse and fracture often occur due to natural disasters, structural diseases or overloading. Because bridges are usually important nodes, bridge interruption will greatly affect disaster relief. People and vehicles travel, emergency temporary bridge came into being. Traditional emergency bridge ("321" Bailey steel bridge) is convenient and fast to build, but it can only be used as an emergency temporary bridge, the late need to dismantle and rebuild a new bridge. This paper relies on Chongqing transportation science and technology project "the technology research of rapid prefabricated emergency bridge and its transformation into permanent bridge". The structure, design and construction methods of fast assembled steel-concrete composite bridge which can be used in emergency are put forward. The main research contents and results are as follows: The main beam of the steel-concrete composite bridge which can be used in emergency is the composite structure of precast concrete deck slab and steel main beam, which can restore the traffic in a short time, ensure the emergency demand such as disaster relief, travel and so on. It can avoid the repeated construction of emergency bridge and long-term bridge, and realize the transformation from emergency bridge to long-term bridge conveniently and quickly, which is beneficial to the conservation of resources and environmental protection. (2) the composite steel-concrete bridge can be divided into steel bridge deck emergency bridge and concrete bridge deck emergency bridge according to the material of emergency bridge deck during emergency construction. The construction speed of steel bridge slab is faster than that of concrete deck, and the erection is more convenient, and the concrete deck is more convenient and fast when it is converted to the long-term bridge. Through the analysis of the whole process force of the two schemes. The feasibility is verified. (3) there are different requirements on the main beam structure, design load, strength and stiffness requirements of the emergency bridge and the long term bridge in the emergency stage of the rapidly assembled steel-concrete composite bridge. In this paper, the design method is studied. Based on the theory of structural optimization and taking the minimum material cost as the objective function, the stress control equation of main beam steel and concrete is established. Based on reasonable assumption and simplification, the design optimization method of steel-concrete composite beam is put forward and realized by matlab program, which can be calculated according to the span and width of the bridge. The parameters such as load requirement can be used to calculate the recommended values of the main parameters such as the number of the main beam, the type of section and the size of the main beam. 4 according to the construction and construction requirements of the fast assembly steel-concrete composite bridge which can be used in emergency, the steel truss transverse structure is adopted. The mechanical behavior of steel truss is analyzed and the structural design is carried out by using the finite-element Abaqus model. The upper and lower chords are asymmetrically designed. At the top of the chord on the transverse connection of the steel truss, a bearing steel plate with the effect of the edge of the supporting bridge deck plate is arranged. The analysis shows that the displacement difference between the two sides of the bridge deck plate under wheel load is reduced by 21.23% and 54.45% than that of the bridge deck plate without supporting steel plate, and the analysis shows that the displacement difference between the two sides of the bridge deck slab is reduced by 21.23% or 54.45%. (5) the parameter analysis of the lateral distribution performance of the bridge is carried out by using MIDAS. The results of finite element analysis of beam lattice space are compared with those of the traditional method. A modified articulation method is proposed, which is suitable for bridges with similar I-shaped steel concrete deck slab composite structure by modifying the thickness of bridge deck slab. Board (. Beam) method. The calculated results of the modified hinged plate (beam) method are in good agreement with the finite element results of the beam lattice.
【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】：U442.5

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