后张有粘结预应力结构监测与分析

发布时间：2018-03-04 20:24

本文选题：预应力框架结构　切入点：预应力损失　出处：《辽宁工程技术大学》2013年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土结构中发挥重要作用的是预应力筋,通过对预应力筋施加预应力使结构预先起拱,以满足大跨度、大空间的使用要求。但是,基于混凝土的收缩徐变性能、预应力钢筋的松弛性能以及预应力张拉工艺,预应力钢筋中的预应力会逐步地减小,需要经过相当长的时间才能稳定下来。从张拉锚固到最终结构中预应力稳定下来,预应力损失的大小,将直接影响到预应力筋中建立的预应力,当然也影响到预应力结构的性能。另外,在使用阶段预应力筋的锈蚀也将影响到结构中的预应力。因此,为了使结构能运行健康,必须从张拉锚固开始对结构中的预应力进行长期监测,掌握预应力的变化规律。本文以阜新市规划展示馆、博物展示馆和市民文化活动中心(简称“两馆一心”)工程为背景,对其预应力结构部分预应力筋的张拉及预应力损失进行全程监测,并对预应力结构的变形进行校核,具体包括以下内容：(1)详细介绍了本项目预应力损失监测的过程,包括监测设备的性能、监测目标的选择以及监测的具体实施过程；(2)对各监测梁从张拉锚固到灌浆封锚期间采集的数据进行分析,得到了预应力损失的变化规律,对比分析了单向张拉预应力筋和双向张拉预应力筋两种不同的施工方法下,梁中建立的预应力以及预应力损失的变化过程；(3)对预应力梁的变形及支撑预应力梁的筒体结构的侧向变形进行现场实测,验证了预应力筋的张拉效果满足要求,筒体结构抗侧刚度的设计满足要求。
[Abstract]:Play an important role in the prestressed concrete structure is prestressed reinforcement of prestressed tendons, the structure of the pre camber, to meet the needs of large span, large space requirements. However, shrinkage and creep of concrete based on the relaxation properties of prestressed reinforced and prestressed tensioning, prestressed reinforcement in prestressed will gradually reduce the need to stabilize, after quite a long time. From the tension anchor to the final structure of prestressed stabilized, prestress loss size, will directly affect the establishment of prestress, of course, also affect the performance of prestressed concrete structure. In addition, in the stage of prestressed reinforcement corrosion will also affect the structure the prestressed. Therefore, in order to make the structure to run health, must from the tension anchor to the long-term monitoring of the structure in the hands of the prestress, prestress Changes in the law. This paper takes Fuxin city planning exhibition hall, exhibition hall and museum public cultural activities center (referred to as the "two one") project as the background, the prestressed structure of partially prestressed tension and prestress losses were monitored, and the deformation of prestressed structure is checked, including the following: (1) introduced the project of prestressing loss monitoring, including performance monitoring equipment, monitoring the target selection and implementation process of monitoring; (2) the monitoring beam from the tension anchor to anchor sealing grouting during the data analysis, the change regularity of prestress loss, comparative analysis of the one-way Zhang pull tendons and two-way prestress of two different construction methods, build the change process in the prestressed beam and prestressing loss; (3) on the deformation and support of prestressed beam The lateral deformation of the prestressed beam tube structure is measured in situ. It is verified that the tension effect of the prestressed bar meets the requirements, and the design of the lateral stiffness of the cylinder structure meets the requirements.

【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU378;TU317

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