高强自密实钢管混凝土配合比优化及缺陷检测技术分析研究

发布时间：2018-04-23 13:32

本文选题：钢管混凝土 + 自密实　；参考：《西安建筑科技大学》2017年硕士论文

【摘要】：随着国民经济水平的提高和建筑技术的快速发展,超高层建筑在我国的应用越来越广,而外框内筒的结构设计成为越来越多的超高层建筑首选的结构形式,相应的,钢管混凝土结构的应用也越来越广泛。本文围绕着钢管混凝土的浇筑质量问题,结合具体的工程案例,从高强自密实混凝土配合比设计、钢管混凝土温度场的有限元分析和钢管混凝土缺陷检测及修复技术上进行了详细的叙述。首先,在高强自密实混凝土配合比设计优化过程中,基于行业标准和经验规范,提出了一种应用于商业分析的实验设计方法,分析出具体混凝土配合比多目标预期的最优组合值,提供了一种更加方便快捷、实用性强的计算机软件处理方法;其次,基于大体积混凝土水化热分析的思路,将建立的有限元模型与现场实测统计的钢管柱内核心混凝土水化热阶段的温度场变化进行对比分析,优化有限元模型,为钢管混凝土在太阳直射、环境温度变化快等情况下的温差分析提供理论模型;最后,通过对1:1的带缺陷钢管柱试件进行超声检测试验,并用人为模拟缺陷的钢管柱与纯混凝土在同等条件下的超声波检测的波速和频率进行对比,着重分析了判定是否有脱空缺陷的超声波检测方法,并设计出了一套完善的修复工艺。本文的监测流程和修复方法,在案例工程中的应用结果良好,局部出现轻微缺陷的构件也得到了解决。本文研究成果可以为今后类似工程提供参考借鉴。
[Abstract]:With the improvement of national economy level and the rapid development of building technology, the application of super high-rise building in our country is more and more extensive, and the structural design of outer frame and inner tube becomes the preferred structural form of super high-rise building. The application of concrete-filled steel tube (CFST) structure is more and more extensive. This paper focuses on the quality of concrete-filled steel tube (CFST) pouring, combined with concrete engineering cases, from the design of high strength self-compacting concrete mix ratio. The finite element analysis of the temperature field of concrete-filled steel tube (CFST) and the defect detection and repair technology of CFST are described in detail. Firstly, an experimental design method for commercial analysis is proposed based on industry standards and empirical norms in the optimization process of mix ratio design of high-strength self-compacting concrete. The optimum combination value of concrete mix ratio is analyzed, which provides a more convenient and practical computer software processing method. Secondly, based on the idea of mass concrete hydration heat analysis, The finite element model established is compared with the temperature field change in the hydration heat stage of the core concrete in the steel tube column, and the finite element model is optimized to be the direct fire of the concrete filled steel tube in the sun. A theoretical model is provided for the analysis of temperature difference under the condition of rapid change of ambient temperature. Finally, the ultrasonic test of the steel tube column with defects at 1:1 is carried out. Compared with the ultrasonic wave velocity and frequency of the artificial simulated steel tube column and pure concrete under the same conditions, the ultrasonic detection method for determining whether there is a void defect is analyzed. And designed a set of perfect repair technology. The monitoring flow and repair method in this paper are well applied in case engineering, and the components with slight defects are solved. The research results in this paper can provide reference for similar projects in the future.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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