基于裂缝特征参数的混凝土梁预应力评价
发布时间：2018-08-22 07:18
【摘要】：预应力技术已广泛应用于桥梁结构的建设当中，然而，由于设计、施工及运营管理方面的不足，在预应力混凝土桥梁快速发展的同时也导致了大量的病害，这不仅对桥梁结构的使用性能产生影响，严重时更危及到结构的安全。本文针对既有预应力混凝土桥梁的开裂问题，在实测裂缝参数的基础上，对主梁各开裂段进行分析，评价了开裂后预应力混凝土梁中的有效预应力。 本文的研究内容主要为以下几个方面： 首先，提出了预应力混凝土矩形、T形、箱形截面开裂后有效预应力的分析方法，在给定混凝土受压区高度的情况下，得到了截面有效预应力的大小，对评价桥梁中有效预应力的沿程分布提供了理论依据。 其次，以截面分析作为基础，提供了有效预应力沿程分布的分析方法，并以一片预应力混凝土简支T梁为例，，建立了在不同荷载等级下的主梁裂缝分布统计参数，采用解析分析法计算得到主梁中的有效预应力。 最后，以一座开裂较严重的预应力混凝土小箱梁作为依托工程，计算了各张拉控制力等级下的混凝土受压区高度和有效预应力大小，并与实际裂缝状况下的有效预应力进行了比较。
[Abstract]:Prestressed technology has been widely used in the construction of bridge structures. However, due to the deficiencies in design, construction and operation management, the rapid development of prestressed concrete bridges has also led to a large number of diseases. This not only affects the performance of bridge structure, but also endangers the safety of bridge structure. In view of the cracking problem of the existing prestressed concrete bridge, based on the measured crack parameters, this paper analyzes each crack section of the main beam, and evaluates the effective prestress in the post-cracking prestressed concrete beam. The main contents of this paper are as follows: firstly, an analytical method of effective prestressing force after cracking of rectangular T-shaped and box section of prestressed concrete is proposed. The size of effective prestress of section is obtained, which provides a theoretical basis for evaluating the distribution of effective prestress along the bridge. Secondly, based on the section analysis, the analysis method of effective prestress distribution along the course is provided, and the statistical parameters of crack distribution of the main beam under different load levels are established by taking a prestressed concrete simply supported T beam as an example. The effective prestress in the main beam is calculated by analytic analysis method. Finally, based on a small prestressed concrete box girder with serious cracking, the height of the concrete compression zone and the effective prestressing force under each tension control force grade are calculated. It is compared with the effective prestressing force under the actual crack condition.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.35
本文编号：2196366
[Abstract]:Prestressed technology has been widely used in the construction of bridge structures. However, due to the deficiencies in design, construction and operation management, the rapid development of prestressed concrete bridges has also led to a large number of diseases. This not only affects the performance of bridge structure, but also endangers the safety of bridge structure. In view of the cracking problem of the existing prestressed concrete bridge, based on the measured crack parameters, this paper analyzes each crack section of the main beam, and evaluates the effective prestress in the post-cracking prestressed concrete beam. The main contents of this paper are as follows: firstly, an analytical method of effective prestressing force after cracking of rectangular T-shaped and box section of prestressed concrete is proposed. The size of effective prestress of section is obtained, which provides a theoretical basis for evaluating the distribution of effective prestress along the bridge. Secondly, based on the section analysis, the analysis method of effective prestress distribution along the course is provided, and the statistical parameters of crack distribution of the main beam under different load levels are established by taking a prestressed concrete simply supported T beam as an example. The effective prestress in the main beam is calculated by analytic analysis method. Finally, based on a small prestressed concrete box girder with serious cracking, the height of the concrete compression zone and the effective prestressing force under each tension control force grade are calculated. It is compared with the effective prestressing force under the actual crack condition.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.35
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