基于长细比变化的BFRP加固钢筋混凝土圆柱承载力研究

发布时间：2018-07-31 10:16

【摘要】：玄武岩纤维增强复合材料(BFRP)因具有强度高、延性好、耐高温、耐腐蚀、施工方便以及价格低廉等特性,被公认为一种新型高性能绿色环保复合材料。得到了土木工程界的高度关注,并在混凝土结构加固中得到广泛的应用。国内外有很多学者对BFRP加固混凝土柱的研究基本上集中在短柱方面,对BFRP加固不同长细比的钢筋混凝土圆柱稳定性能方面的研究却相对较少。因此分析长细比变化对BFRP加固钢筋混凝土圆柱轴心受压力学性能的影响,对其稳定性能方面的研究有着重要意义。本文主要是通过有限元软件ABAQUS对BFRP加固钢筋混凝土圆柱进行了数值分析。构件模型选用直径150mm,长细比(L/D)分别为3、5、7、9、11的钢筋混凝土圆柱。然后对相同长细比的圆柱分别粘贴0层、1层、2层、3层、4层、5层BFRP布,粘贴方式采用满包粘贴。分析了在长细比相同时,未加固与加固不同层数的BFRP对钢筋混凝土圆柱承载力的影响,以及不同长细比对圆柱稳定承载力的影响。模拟结果表明:采用包裹BFRP布加固的钢筋混凝土圆柱极限承载力和延性均得到显著提高,从而达到结构加固的效果。同一长细比的钢筋混凝土圆柱承载力随着加固层数的增多而不断提高,但提高幅度却随着加固层数的增多先增大后减小。另外随着长细比的变大,提高幅度逐渐减小。在长细比(L/D)相同的情况下,BFRP布加固钢筋混凝土圆柱的稳定系数比未加固柱小。根据模拟数据,得出了BFRP布加固钢筋凝土圆柱稳定系数与长细比关系曲线。在此基础上得到其稳定承载力的计算公式,为加固实际工程提供一定的理论依据。
[Abstract]:Basalt fiber reinforced composite (BFRP) has been recognized as a new type of high performance green environmental protection composite due to its high strength, good ductility, high temperature resistance, corrosion resistance, easy construction and low price. It has been highly concerned by civil engineering and widely used in concrete structure strengthening. Many scholars at home and abroad have focused on the study of reinforced concrete columns strengthened with BFRP, but less on the stability of reinforced concrete columns with different aspect ratio of BFRP. Therefore, it is of great significance to analyze the influence of the aspect of aspect ratio on the mechanical properties of reinforced concrete columns strengthened by BFRP under axial compression, and to study the stability of the columns. In this paper, the finite element software ABAQUS is used to analyze the reinforced concrete columns strengthened by BFRP. The model is composed of a reinforced concrete column with a diameter of 150mm and a aspect ratio (L / D) of 3 / 5 / 7 / 9 / 11, respectively. Then, the BFRP cloth of 0 layer, 1 layer, 2 layer, 3 layer, 4 layer and 5 layer are respectively pasted to the cylinder with the same slenderness ratio, and the paste mode is full package paste. In this paper, the influence of BFRP without reinforcement and reinforcement on the bearing capacity of reinforced concrete columns is analyzed when the aspect ratio is the same, and the influence of different aspect ratios on the stability bearing capacity of columns is also analyzed. The simulation results show that the ultimate bearing capacity and ductility of reinforced concrete columns strengthened with wrapped BFRP sheets have been significantly improved, thus achieving the effect of structural strengthening. The bearing capacity of reinforced concrete columns with the same aspect ratio increases with the increase of the number of strengthened layers, but the increase range increases first and then decreases with the increase of the number of strengthened layers. In addition, with the increasing of aspect ratio, the increasing amplitude decreases gradually. Under the same aspect ratio (L / D), the coefficient of stability of reinforced concrete columns strengthened with BFRP sheets is smaller than that of columns without reinforcement. According to the simulation data, the relationship curve between the stability coefficient and the aspect ratio of reinforced concrete columns strengthened with BFRP sheets is obtained. On this basis, the calculation formula of its stable bearing capacity is obtained, which provides certain theoretical basis for strengthening practical engineering.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.3

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