圆钢管混凝土短柱轴压性能尺寸效应试验研究

发布时间：2018-03-28 10:08

本文选题：钢管混凝土柱　切入点：素混凝土柱　出处：《哈尔滨工业大学》2014年硕士论文

【摘要】：随着经济与科技的发展，现代工程不断向大跨、重载、高耸的方向发展，钢管混凝土以其高承载力、优异的抗震性能在超高层建筑结构、大跨度拱桥及特种结构中得到了广泛应用。随着建筑高度和拱桥跨度的不断增加，钢管混凝土的截面尺寸不断创造新的纪录，其内核心混凝土的截面尺寸也在不断增加，且由于钢管和内核心混凝土的相互作用，使其尺寸效应问题更为复杂。现有规程、计算理论均是基于小尺寸构件的研究结论，直接套用可能高估了大尺寸构件的承载力，而目前国内外关于钢管混凝土构件尺寸效应的研究均较少。在影响钢管混凝土轴压短柱的众多因素中，本文用控制变量法突出尺寸对承载力的影响，，进行了相对精细的实验，具体开展了如下工作： (1)进行了两组同时满足几何相似条件、力学性能相似条件的钢管混凝土轴压短柱的实验，研究了尺寸对钢管混凝土轴压短柱破坏模式、承载力、横向变形系数、峰值应变、延性的影响规律。 (2)进行了与上述钢管混凝土柱内核心混凝土尺寸完全相同的素混凝土柱的轴压实验，研究了尺寸对素混凝土柱轴压破坏模式、承载力、刚度、横向变形系数、峰值应变、延性的影响规律。并选取五种有代表性的尺寸效应模型对实验结果进行拟合对比分析，为揭示钢管混凝土柱尺寸效应产生内在机理与表现形式奠定基础。 (3)通过将钢管混凝土柱与素混凝土柱的承载力进行对比分析，得出由于钢管对混凝土约束而使内核心混凝土承载力提高的部分△N在总承载力Nu中所占比例与尺寸的关系。通过剥离分析得出处于三向受压混凝土的极限压应力与侧向约束应力，用五种方法对比分析钢管混凝土承载力的尺寸效应规律。
[Abstract]:With the development of economy and science and technology, modern engineering has been developing to the direction of long span, heavy load and towering. Concrete filled steel tube (CFST) is widely used in super high-rise building with its high bearing capacity and excellent seismic performance. Long span arch bridges and special structures have been widely used. With the increasing of building height and span of arch bridge, the section size of concrete-filled steel tube (CFST) is constantly creating new records, and the cross-section size of core concrete is also increasing. Due to the interaction between steel tube and inner core concrete, the problem of dimension effect is more complicated. The existing rules and calculation theories are based on the conclusion of the research of small size members, which may overestimate the bearing capacity of large size members. At present, there are few researches on the size effect of concrete-filled steel tube members at home and abroad. Among the many factors that affect the axial compression of short columns of concrete-filled steel tubular members, the control variable method is used to highlight the influence of size on the bearing capacity, and a relatively fine experiment is carried out. The following work has been carried out:. In this paper, two groups of concrete filled steel tubular columns with similar geometric and mechanical properties are tested, and the failure mode, bearing capacity, transverse deformation coefficient, peak strain of short columns under axial compression of steel tubular concrete are studied, and the results are as follows: (1) the failure mode, bearing capacity, transverse deformation coefficient and peak strain of concrete filled steel tubular columns under axial compression are studied. The effect of ductility. The axial compression experiments of plain concrete columns with the same size as the core concrete columns mentioned above have been carried out. The failure mode of axial compression, bearing capacity, stiffness, transverse deformation coefficient, peak strain of plain concrete columns have been studied. Five typical size effect models were selected to fit and contrast the experimental results, which laid a foundation for revealing the inherent mechanism and manifestation of the size effect of concrete-filled steel tubular columns. By comparing the bearing capacity of concrete-filled steel tubular columns with plain concrete columns, The relationship between the proportion and size of the part N in the total bearing capacity Nu of the inner core concrete due to the constraint of the steel tube on concrete is obtained. The ultimate compression response of the concrete under three directions compression is obtained by peeling analysis. Force and lateral confinement stress, The size effect of concrete filled steel tube (CFST) bearing capacity is analyzed by means of five methods.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

【参考文献】