發(fā)布時(shí)間：2018-03-28 10:08

  本文選題：鋼管混凝土柱　切入點(diǎn)：素混凝土柱　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著經(jīng)濟(jì)與科技的發(fā)展，現(xiàn)代工程不斷向大跨、重載、高聳的方向發(fā)展，鋼管混凝土以其高承載力、優(yōu)異的抗震性能在超高層建筑結(jié)構(gòu)、大跨度拱橋及特種結(jié)構(gòu)中得到了廣泛應(yīng)用。隨著建筑高度和拱橋跨度的不斷增加，鋼管混凝土的截面尺寸不斷創(chuàng)造新的紀(jì)錄，其內(nèi)核心混凝土的截面尺寸也在不斷增加，且由于鋼管和內(nèi)核心混凝土的相互作用，使其尺寸效應(yīng)問(wèn)題更為復(fù)雜�，F(xiàn)有規(guī)程、計(jì)算理論均是基于小尺寸構(gòu)件的研究結(jié)論，直接套用可能高估了大尺寸構(gòu)件的承載力，而目前國(guó)內(nèi)外關(guān)于鋼管混凝土構(gòu)件尺寸效應(yīng)的研究均較少。在影響鋼管混凝土軸壓短柱的眾多因素中，本文用控制變量法突出尺寸對(duì)承載力的影響，，進(jìn)行了相對(duì)精細(xì)的實(shí)驗(yàn)，具體開(kāi)展了如下工作： (1)進(jìn)行了兩組同時(shí)滿足幾何相似條件、力學(xué)性能相似條件的鋼管混凝土軸壓短柱的實(shí)驗(yàn)，研究了尺寸對(duì)鋼管混凝土軸壓短柱破壞模式、承載力、橫向變形系數(shù)、峰值應(yīng)變、延性的影響規(guī)律。 (2)進(jìn)行了與上述鋼管混凝土柱內(nèi)核心混凝土尺寸完全相同的素混凝土柱的軸壓實(shí)驗(yàn)，研究了尺寸對(duì)素混凝土柱軸壓破壞模式、承載力、剛度、橫向變形系數(shù)、峰值應(yīng)變、延性的影響規(guī)律。并選取五種有代表性的尺寸效應(yīng)模型對(duì)實(shí)驗(yàn)結(jié)果進(jìn)行擬合對(duì)比分析，為揭示鋼管混凝土柱尺寸效應(yīng)產(chǎn)生內(nèi)在機(jī)理與表現(xiàn)形式奠定基礎(chǔ)。 (3)通過(guò)將鋼管混凝土柱與素混凝土柱的承載力進(jìn)行對(duì)比分析，得出由于鋼管對(duì)混凝土約束而使內(nèi)核心混凝土承載力提高的部分△N在總承載力Nu中所占比例與尺寸的關(guān)系。通過(guò)剝離分析得出處于三向受壓混凝土的極限壓應(yīng)力與側(cè)向約束應(yīng)力，用五種方法對(duì)比分析鋼管混凝土承載力的尺寸效應(yīng)規(guī)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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU398.9

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