偏心受压部分填充圆形钢管混凝土桥墩的抗震性能研究

发布时间：2018-06-09 04:51

本文选题：偏心受压 + 部分填充　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：部分填充钢管混凝土结构是一种在钢管中部分填充混凝土来承担受压荷载的建筑构件,能充分发挥钢材和混凝土的材料优势,并且具有承载能力高、抗震性能好、节约钢材还有施工简便等突出优点,在高层建筑、城市桥梁、大跨度结构中得到了广泛的应用。但是在国内的桥梁工程中,只有很少的桥墩采用钢管混凝土结构,部分填充混凝土的钢桥墩结构更是少见。本文是在日本、美国等国家对部分填充混凝土的钢桥墩的研究基础上,用ABAQUS有限元分析软件,对其进行了抗震性能分析。在分析时,混凝土选用了塑性损伤本构模型,并且考虑了钢管的约束作用。钢材选用滞回荷载作用下,考虑包辛格效应的本构关系模型。本文进行的主要工作：首先在轴心受压部分填充钢管混凝土桥墩柱合理填充高度公式基础上,计算出偏心受压部分填充混凝土钢管混凝土桥墩柱的填充高度,然后对偏心受压部分填充矩形钢管混凝土桥墩柱和偏心受压圆形空钢管桥墩柱的力学性能进行研究分析,通过与参考文献对比验证了有限元分析的有效性。在偏心受压部分填充矩形钢管混凝土桥墩柱和偏心受压圆形空钢管桥墩柱研究基础上,对20个偏心受压部分填充圆形钢管混凝土桥墩柱进行抗震性能分析,其中包括滞回曲线、承载力与位移骨架曲线、刚度退化曲线、延性性能以及耗能能力等,详细研究了偏心率、径厚比、长细比等参数对该类桥墩柱的抗震性能的影响。研究表明试件的延性能力主要与偏心率、长细比有关,承载能力与偏心率、径厚比有关。结构的延性能力随着长细比的减小而增大,承载力随径厚比的减小而提高。承载力和延性性能都随着偏心率增大而降低,当偏心率超过0.3时损失较为严重。
[Abstract]:Partially filled concrete filled steel tube (CFST) structure is a kind of building member which is partially filled with concrete in the steel tube to bear the compressive load. It can give full play to the material advantages of steel and concrete, and has high bearing capacity and good seismic performance. It has been widely used in high-rise buildings, urban bridges and long-span structures because of its advantages of saving steel and easy construction. However, in the domestic bridge engineering, only a few piers use concrete filled steel tubular structure, partly filled with concrete steel pier structure is more rare. In this paper, based on the research of partially filled steel pier in Japan and America, the aseismic performance of steel pier is analyzed by using Abaqus finite element analysis software. In the analysis, the plastic damage constitutive model is used and the constraint of steel pipe is considered. The constitutive relation model of Bauschinger effect is selected for steel under hysteretic load. The main work of this paper is as follows: firstly, on the basis of the formula of reasonable filling height of filled concrete filled steel tube pier column under axial compression, the filling height of the partially filled concrete filled steel tube pier column with eccentric compression is calculated. Then the mechanical properties of rectangular concrete-filled steel tube pier columns filled with eccentric compression and eccentric compression circular hollow steel pipe pier columns are studied and analyzed. The validity of finite element analysis is verified by comparing with references. Based on the research of filled rectangular steel tube concrete filled pier columns with eccentric compression and circular hollow steel tube piers filled with eccentric compression, the seismic behavior of 20 eccentric compression partially filled circular steel tube concrete piers is analyzed, including hysteretic curves. The influence of eccentricity ratio, ratio of diameter to thickness and aspect ratio on the seismic behavior of this kind of pier column is studied in detail, such as bearing capacity and displacement skeleton curve, stiffness degradation curve, ductility performance and energy dissipation capacity. The results show that the ductility of the specimens is mainly related to the eccentricity ratio, the aspect ratio, the bearing capacity and the eccentricity ratio and the ratio of diameter to thickness. The ductility of the structure increases with the decrease of the aspect ratio, and the bearing capacity increases with the decrease of the ratio of diameter to thickness. Both the bearing capacity and ductility decrease with the increase of eccentricity, and the loss is more serious when the eccentricity exceeds 0.3.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.22

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