公路CFRP筋预应力混凝土小箱梁标准设计研究
发布时间：2018-10-04 19:29
【摘要】：自20世纪以来,公路预应力混凝土小箱梁在我国发展非常迅速,然而混凝土结构中的钢筋随着时间推移,将会发生锈蚀,甚至锈断,特别是桥位处空气中含有大量酸、碱、盐等化学物质的情况,极易发生电化学腐蚀。加上很多预应力混凝土结构混凝土密实性未达到要求或者混凝土保护层不足,致使预应力筋暴露与含有大量水分、酸、碱等腐蚀性成分的空气中。为了更好的让预应力小箱梁能够满足这些特殊环境对预应力筋的要求,本文探讨了采用CFRP筋(碳纤维增强复合材料筋)代替普通预应力筋用于公路预应力混凝土小箱梁,因其具有质量轻、强度高以及抗腐蚀性好等诸多优于普通预应力钢绞线的特点,有望从根本上解决公路预应力混凝土小箱梁桥遇到的一些问题。为此本文探索性的对公路CFRP预应力混凝土小箱梁设计方法进行了研究,研究的主要内容包括:CFRP预应力筋小箱梁的基本特点。包括CFRP筋的基本性能、CFRP预应力筋的锚固方式、CFRP筋作为预应力筋的可行性分析等。详细如下:①公路CFRP预应力混凝土小箱梁设计原理和方法研究。给出小箱梁破坏界定公式、抗弯承载力极限状态计算方法、抗剪承载力极限状态计算方法。②CFRP预应力混凝土小箱梁受力特点研究。建立公路普通预应力和CFRP预应力混凝土小箱梁仿真模型,研究分析其受力特点。③CFRP预应力混凝土小箱梁设计的关键性技术进行分析研究。主要是CFRP筋弯折问题、锚固问题和预应力损失问题。④设计施工要点研究。针对以上分析,给出CFRP预应力混凝土小箱梁设计注意事项,并结合实际情况,给出公路CFRP预应力混凝土小箱梁施工注意事项。⑤经济性分析。将CFRP筋预应力混凝土小箱梁标准设计与普通预应力筋小箱梁标准设计进行对比,比较分析采用CFRP作为预应力筋的经济价值。
[Abstract]:Since the 20th century, the highway prestressed concrete small box girder has developed very rapidly in our country. However, the reinforcement in the concrete structure will be corroded or even rusted over time, especially in the air at the bridge site, there is a lot of acid and alkali in the air. In the case of salt and other chemical substances, electrochemical corrosion is easy to occur. In addition many prestressed concrete structure concrete compactness does not meet the requirements or the concrete cover is insufficient resulting in prestressed tendons exposed to a large amount of water acid alkali and other corrosive components of the air. In order to make the prestressed small box girder meet the demand of these special environments, this paper discusses the use of CFRP tendons (carbon fiber reinforced composite tendons) instead of ordinary prestressed tendons for highway prestressed concrete small box girders. Because of its characteristics of light weight, high strength and good corrosion resistance, it is expected to solve some problems of highway prestressed concrete small box girder bridge fundamentally. In this paper, the design method of CFRP prestressed concrete small box girder is studied in this paper. The main contents of the study include the basic characteristics of the small box girder reinforced by CFRP. The basic performance of CFRP tendons and the feasibility analysis of CFRP tendons as prestressing tendons are discussed in this paper. The design principle and method of CFRP prestressed concrete small box girder are studied below. The failure definition formula of small box girder, the calculation method of ultimate state of flexural bearing capacity and the calculation method of ultimate state of shear bearing capacity are given. The simulation model of highway prestressed concrete and CFRP prestressed concrete small box girder is established, and the key technology of the design of prestressed concrete small box girder is analyzed and analyzed. The main points of design and construction are CFRP reinforcement bending, Anchorage and Prestress loss. In view of the above analysis, this paper gives the matters needing attention in the design of CFRP prestressed concrete small box girder, and combining with the actual situation, gives the economic analysis of the construction matters 5 of the highway CFRP prestressed concrete small box girder. The standard design of prestressed concrete small box girder reinforced by CFRP is compared with the standard design of small box girder with common prestressing tendons. The economic value of using CFRP as prestressing tendons is compared and 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】：U442.5
本文编号：2251593
[Abstract]:Since the 20th century, the highway prestressed concrete small box girder has developed very rapidly in our country. However, the reinforcement in the concrete structure will be corroded or even rusted over time, especially in the air at the bridge site, there is a lot of acid and alkali in the air. In the case of salt and other chemical substances, electrochemical corrosion is easy to occur. In addition many prestressed concrete structure concrete compactness does not meet the requirements or the concrete cover is insufficient resulting in prestressed tendons exposed to a large amount of water acid alkali and other corrosive components of the air. In order to make the prestressed small box girder meet the demand of these special environments, this paper discusses the use of CFRP tendons (carbon fiber reinforced composite tendons) instead of ordinary prestressed tendons for highway prestressed concrete small box girders. Because of its characteristics of light weight, high strength and good corrosion resistance, it is expected to solve some problems of highway prestressed concrete small box girder bridge fundamentally. In this paper, the design method of CFRP prestressed concrete small box girder is studied in this paper. The main contents of the study include the basic characteristics of the small box girder reinforced by CFRP. The basic performance of CFRP tendons and the feasibility analysis of CFRP tendons as prestressing tendons are discussed in this paper. The design principle and method of CFRP prestressed concrete small box girder are studied below. The failure definition formula of small box girder, the calculation method of ultimate state of flexural bearing capacity and the calculation method of ultimate state of shear bearing capacity are given. The simulation model of highway prestressed concrete and CFRP prestressed concrete small box girder is established, and the key technology of the design of prestressed concrete small box girder is analyzed and analyzed. The main points of design and construction are CFRP reinforcement bending, Anchorage and Prestress loss. In view of the above analysis, this paper gives the matters needing attention in the design of CFRP prestressed concrete small box girder, and combining with the actual situation, gives the economic analysis of the construction matters 5 of the highway CFRP prestressed concrete small box girder. The standard design of prestressed concrete small box girder reinforced by CFRP is compared with the standard design of small box girder with common prestressing tendons. The economic value of using CFRP as prestressing tendons is compared and 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】：U442.5
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相关期刊论文 前1条
1 高丹盈,B.Brahim;纤维聚合物筋与混凝土粘结性能的影响因素[J];工业建筑;2001年02期
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