桥梁缓粘结预应力技术研究

发布时间：2018-06-22 13:15

本文选题：缓粘结剂 + 缓粘结预应力筋　；参考：《重庆交通大学》2015年硕士论文

【摘要】：缓粘结预应力技术是一种新型的预应力技术,它结合了无粘结预应力和有粘结预应力两种技术的优点,同时克服了两种技术的不足。缓粘结预应力技术将无粘结的油脂代替以缓粘结材料,缓粘结材料早期不凝固,随着龄期增长逐渐硬化使钢绞线和混凝土粘结在一起,最后成为类似有粘结的钢绞线。这样,达到了早期施工方便快捷,后期安全可靠的使用效果,是一种非常有前景的预应力技术。缓粘结预应力混凝土结构主要包括缓粘结预应力筋及结构混凝土,论文主要对缓粘结预应力结构的特点、缓粘结预应力筋、缓粘结剂及大直径钢绞线缓粘结预应力技术等进行研究。首先,阐述了缓粘结预应力结构的工作原理,并结合其工作原理,分析了缓粘结预应力结构的特点。在此基础上,建立了相应的设计与施工计算方法,为缓粘结预应力预应力体系的应用奠定基础。其次,以缓粘结预应力筋为基础引入了缓粘结剂(包括缓凝砂浆和缓凝树脂),并分别对凝砂浆和缓凝树脂的缓凝机理进行了探讨。在此基础上研究了缓凝砂浆和缓凝树脂的特点,结合外包砂浆型缓粘结预应力筋和外包树脂型缓粘结预应力筋的结构和原理,对两种缓粘结预应力体系进行了分析比较。同时,分析了缓粘结剂的力学性能、摩阻系数、物理性质、稳定性等。分析了缓粘结预应力混凝土梁中缓粘结预应力筋张拉摩阻力的变化规律。然后,引入了大直径预应力钢绞线,通过对大直径预应力钢绞线的结构分析,并且结合大直径预应力钢绞线及缓粘结剂的特点,将两者结合起来,研究提出了一种新型预应力结构。最后,结合广西某公路新建工程的特点,以及结合缓粘结预应力技术的适用条件,以广西某公路工程一座大桥为例,使用缓粘结预应力技术对预应力箱梁进行优化设计,并分析了缓粘结预应力技术经济效益和社会效益。
[Abstract]:Slow bonded prestressing is a new type of prestressing technology, which combines the advantages of unbonded prestressing and bonded prestressing, and overcomes the shortcomings of the two technologies. The technology of slow bond prestressing replaces the unbonded grease with the slow bonded material, which does not solidify early, and then harms gradually with the increase of age so that the steel strand and concrete bond together, and finally become similar to the bonded steel strand. In this way, the early construction is convenient and fast, the later safe and reliable use effect, it is a very promising prestressing technology. Slowly bonded prestressed concrete structure mainly includes slowly bonded prestressed tendons and structural concrete. Slow bonding agent and large diameter steel strands are studied. Firstly, the working principle of slowly bonded prestressed structure is expounded, and the characteristics of slowly bonded prestressed structure are analyzed in combination with its working principle. On this basis, the corresponding design and construction calculation methods are established, which lays a foundation for the application of slow bonded prestressed system. Secondly, the retarded binder (including retarded mortar and retarding resin) is introduced on the basis of retarded prestressing tendons, and the retarding mechanism of mortar and retarding resin is discussed respectively. On this basis, the characteristics of retarded mortar and retarding resin are studied. Combined with the structure and principle of external mortar type slowly bonded prestressing tendons and external resin type slow bonded prestressed tendons, two kinds of slow bonded prestressing systems are analyzed and compared. At the same time, the mechanical properties, friction coefficient, physical properties and stability of the retarded binder are analyzed. The variation law of tensile friction of slowly bonded prestressed concrete beams is analyzed. Then, the large diameter prestressed steel strand is introduced. The structure of the large diameter prestressed steel strand is analyzed, and combined with the characteristics of the large diameter prestressed steel strand and the slow binder, the two are combined together. A new type of prestressed structure is proposed. Finally, according to the characteristics of a new highway construction project in Guangxi and the suitable conditions of slow bonded prestressing force technology, a bridge of a highway project in Guangxi is taken as an example to optimize the design of prestressed box girder by using slow bond prestressing force technology. The economic and social benefits of slowly bonded prestressing are also analyzed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.57

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