灌浆缺陷对套筒连接接头和构件性能影响的研究

发布时间：2018-08-27 17:59

【摘要】：产业化是我国住宅建设的重要发展方向,装配式混凝土结构体系是实现住宅产业化的有效方法。对于装配式混凝土结构,柱、墙等预制构件之间大量采用灌浆套筒的方式连接,套筒灌浆施工的质量水平是影响结构整体性和抗震性能的关键因素。本文所完成的工作是“十三五”国家科技支撑计划课题“工业化建筑质量验收方法及标准体系”(2016YFC0701805)的研究内容之一。本研究主要目的是探讨各类灌浆缺陷对套筒灌浆接头试件和装配式混凝土梁柱试件的性能影响,探索灌浆缺陷的无损检测方法的有效性和适用性。本文主要工作包括:1、通过实际工程的现场调研和灌浆方法及灌浆料性能试验分析灌浆缺陷的类型及其形成机理。2、制作70余个包含不同人工缺陷的套筒接头试件进行单向拉伸试验,研究套筒内部存在不同灌浆缺陷时的破坏特征、承载力和变形性能。3、制作20余个包含灌浆缺陷的试件进行X射线无损检测,探究X射线对灌浆缺陷的识别效果。4、制作5个包含不同灌浆缺陷的装配式混凝土柱进行拟静力试验,研究竖向套筒内的灌浆缺陷对抗震性能的影响。5、制作2个套筒连接的装配式混凝土梁试件进行单调静力试验。试验结果表明:1、套筒灌浆缺陷的主要因素包括灌浆缺陷的位置、灌浆缺陷的尺寸、灌浆缺陷的分布形式、钢筋偏心缺陷、水平灌浆缺陷和灌浆施工时间太长导致灌浆料锚固性能下降的时间缺陷。2、在缺陷当量等效的前提下,试件中部缺陷的影响大于端部缺陷,水平灌浆缺陷大于竖向灌浆缺陷,钢筋偏心情况下的缺陷大于钢筋轴心时的缺陷。3、X射线可以清晰地识别套筒壁和灌浆料的界面,可以识别灌浆料和钢筋的界面,可以识别尺寸为1mm?4mm的灌浆缺陷。4、灌浆缺陷对装配式混凝土柱的影响,主要为降低试件的承载力和延性;导致试件的滞回曲线捏缩效应增强,试件耗能能力下降;加速试件的刚度退化等。5、套筒灌浆连接的装配式混凝土梁的单调静力试验,灌浆饱满前提下,试件能够满足承载力和延性的要求。本文中针对试验的数据,拟合灌浆缺陷对套筒接头各类性能的影响模式;对混凝土梁柱试件相关参数进行无量纲化的分析,为后续研究提供了分析方法,为装配式建筑的质量验收提供参考。
[Abstract]:Industrialization is an important development direction of housing construction in our country. Prefabricated concrete structure system is an effective method to realize housing industrialization. Grouting sleeve is widely used to connect prefabricated elements such as prefabricated concrete structures columns and walls. The quality level of sleeve grouting construction is the key factor to affect the integrity and seismic performance of the structure. The work accomplished in this paper is one of the research contents of the National Science and Technology support Project of the 13th Five-Year Plan, "acceptance method and Standard system of Industrial Building quality" (2016YFC0701805). The main purpose of this study is to investigate the effects of grouting defects on the performance of sleeve grouting joint specimens and assembled concrete Liang Zhu specimens, and to explore the effectiveness and applicability of nondestructive testing methods for grouting defects. The main work of this paper includes: 1, through the field investigation and grouting method of the actual project and the performance test of grouting material to analyze the type of grouting defect and its forming mechanism. 2. To make more than 70 sleeve joint test pieces containing different artificial defects. Uniaxial tensile test, The failure characteristics, bearing capacity and deformability of different grouting defects in the sleeve were studied. More than 20 specimens containing grouting defects were made for X-ray nondestructive testing. To explore the effect of X-ray on the identification of grouting defects. 4. To make five fabricated concrete columns containing different grouting defects for pseudo-static test. The effect of grouting defects in vertical sleeve on seismic performance was studied. 5. Two assembled concrete beams with sleeve connections were made for monotonic static test. The test results show that the main factors of grouting defects in sleeve include the location of grouting defects, the size of grouting defects, the distribution of grouting defects, the eccentric defects of steel bars, Horizontal grouting defect and grouting construction time too long lead to grouting material anchoring performance decline time defect. Under the condition of equivalent defect equivalent, the effect of the defect in the middle part of the specimen is greater than that in the end part, and the horizontal grouting defect is greater than the vertical grouting defect. The defect in the case of eccentric steel bar is greater than that in the axis of steel bar. The X-ray can clearly identify the interface between the sleeve wall and the grouting material, and the interface between the grouting material and the steel bar. The effect of grouting defects on fabricated concrete columns is mainly to reduce the bearing capacity and ductility of the specimens, which leads to the enhancement of the pinch effect of the hysteresis curves and the decrease of the energy consumption capacity of the specimens. Under the condition of full grouting, the specimen can meet the requirements of bearing capacity and ductility. According to the test data, the influence mode of grouting defects on the performance of sleeve joints is fitted in this paper, and the dimensionless analysis of relevant parameters of concrete Liang Zhu specimen is carried out, which provides an analytical method for further research. To provide a reference for the quality acceptance of prefabricated buildings.
【学位授予单位】：中国建筑科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU37

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