预制装配式混凝土结构连接界面钢筋承剪性能试验研究

发布时间：2018-01-16 13:32

本文关键词：预制装配式混凝土结构连接界面钢筋承剪性能试验研究　出处：《北方工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：预制装配式混凝土结构因其施工快速、质量稳定、节能环保等特点在国内外应用广泛。预制构件之间的接缝是影响结构受力性能的关键部位,而钢筋的销栓作用和摩擦抗剪作用是预制装配式混凝土结构构件间剪力传递的主要组成部分。因此,准确地预测连接界面钢筋的承剪性能对于保障预制装配式混凝土结构的安全具有重要意义。本文进行了钢筋混凝土结构连接界面钢筋的承剪性能试验,具体研究内容和成果如下:(1)对比分析国内外钢筋销栓作用试验研究中常用的钢筋界面剪切与钢筋直接剪切两种试验方法,设计了可对钢筋施加水平荷载的钢筋直接剪切试验方案。通过试验探究了不同加载装置对钢筋直接剪切试验结果的影响,确定了适用于钢筋直接剪切试验的多铰联动加载装置。(2)考虑混凝土强度等级、钢筋直径、轴向粘结损伤以及混凝土保护层厚度等影响因素,通过16个试件的钢筋直接剪切试验研究了界面钢筋受剪时的破坏模式、钢筋的极限承载能力、变形特征以及界面处剪力的传递过程,分析了预加轴向粘结损伤引起的耦合损伤作用对钢筋抗剪能力的影响。在试验研究的基础上考虑保护层厚度的影响,对已有钢筋销拴抗剪计算公式进行了修正。(3)对钢筋直接剪切试验中试件内部产生的声发射信号进行采集、、处理,得到声发射撞击计数、能量计数及振铃计数等声发射特征参数,通过对声发射各特征参数、试件加载过程的变形规律以及声源定位技术,分析试验过程中试件内部损伤发展过程。
[Abstract]:Prefabricated concrete structures are widely used at home and abroad because of their characteristics of fast construction, stable quality, energy saving and environmental protection. The joints between prefabricated components are the key parts that affect the mechanical performance of the structures. And the function of pin bolt and friction shear resistance of steel bar is the main component of shear force transfer between precast prefabricated concrete structure members. It is very important to predict accurately the shear behavior of the steel bar at the interface to ensure the safety of prefabricated concrete structure. In this paper, the shear behavior test of the reinforced concrete structure is carried out. The concrete research contents and results are as follows: (1) comparing and analyzing two test methods of reinforcing bar interface shear and steel bar direct shear which are commonly used in the domestic and foreign test research of reinforcing bar pin bolt action. The direct shear test scheme of steel bar which can apply horizontal load to steel bar is designed. The influence of different loading devices on the result of direct shear test of steel bar is explored. The concrete strength grade, steel bar diameter, axial bond damage and the thickness of concrete cover are considered. Through the direct shear test of 16 steel bars, the failure mode, ultimate bearing capacity, deformation characteristics and shear transfer process at the interface are studied. The effect of coupling damage caused by preloading axial bond damage on shear resistance of steel bar is analyzed. The influence of protective layer thickness is considered on the basis of experimental study. The existing formula for calculating shear resistance of steel bars is modified. The acoustic emission signals generated from the specimens in direct shear tests are collected and processed, and the acoustic emission impact counts are obtained. The characteristic parameters of acoustic emission, such as energy count and ringing count, are analyzed by means of the characteristic parameters of acoustic emission, the deformation law of the specimen during loading and the sound source location technology, and the development process of the internal damage of the specimen during the test is analyzed.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375

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