大跨度预应力混凝土连续框架梁张拉控制技术研究

发布时间：2019-04-21 08:10

【摘要】：目前,大面积大柱网预应力混凝土框架结构的相关设计理论已日趋成熟,施工工艺问题也已基本解决,但相关的施工理论与技术方面,尚未见有深入的研究。特别是施工期结构受力状态与变形的分析和控制,以及大跨度预应力框架梁的张拉控制等方面。本文依托宝鸡南站站房工程,深入开展后张预应力空间框架结构长大连续梁的张拉控制技术研究。围绕大跨度预应力混凝土框架梁张拉控制难的问题,主要开展了以下工作:首先,分析了后张预应力框架梁在张拉阶段中预应力损失的影响因素,总结了现行规范中未涉及的由梁侧加腋和刚性柱侧向约束引起的预应力损失的理论分析方法。以站房B区主体结构中E-9~E-10梁段为例,计算了其在施工过程中的预应力损失,为后期的仿真分析和现场监测提供了理论依据。然后,选取站房B区主体结构中位于E轴的连续9跨预应力框架梁作为分析对象,运用ANSYS有限元软件分析了不同施工顺序对框架梁内有效预压力和变形的影响。最后,以E-9~E-10梁段为控制对象,对其在张拉过程中的预应力筋伸长量、梁体反拱值以及梁体控制截面应变进行了理论分析计算。并通过现场监测的方法来保证张拉效果。通过以上理论研究和现场监测,测试结果表明该预应力工程施工质量安全可靠,可为类似工程提供借鉴作用。
[Abstract]:At present, the design theory of large-area large column net prestressed concrete frame structure has matured day by day, the construction technology problem has also been solved basically, but the related construction theory and technology aspect, have not seen the in-depth research. Especially, the analysis and control of the stress state and deformation of the structure during the construction period, as well as the tension control of the long-span prestressed frame beam and so on. In this paper, based on the station project of Baoji South Station, the tension control technology of long-span continuous beam with post-tensioned prestressed space frame structure is studied deeply. Around the difficult problem of tension control of long-span prestressed concrete frame beam, the main work is as follows: firstly, the influence factors of prestressing loss in the tension stage of post-tensioned prestressed frame beam are analyzed. This paper summarizes the theoretical analysis method of prestressing loss caused by lateral restraint of beam side axils and rigid columns, which is not involved in the current code. Taking the E-9~E-10 beam section of the main structure of the station building B as an example, the prestress loss in the construction process is calculated, which provides a theoretical basis for the later simulation analysis and on-the-spot monitoring. Then, the continuous 9-span prestressed frame beam with E axis in the main structure of B area of the station building is selected as the analysis object, and the influence of different construction sequence on the effective pre-pressure and deformation in the frame beam is analyzed by using ANSYS finite element software. Finally, taking the E-9~E-10 beam segment as the control object, the theoretical analysis and calculation of the length of the prestressed tendons, the arch value of the beam body and the strain of the controlled section of the beam during the tension process are carried out. And through the on-the-spot monitoring method to ensure the tension effect. Through the above theoretical research and on-the-spot monitoring, the test results show that the construction quality of the prestressed project is safe and reliable, and it can be used for reference for similar projects.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.57

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