钢骨—钢管混凝土柱抗震性能、抗弯剪承载力研究

发布时间：2018-01-12 20:06

本文关键词：钢骨—钢管混凝土柱抗震性能、抗弯剪承载力研究　出处：《沈阳建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：钢骨-钢管混凝土柱(circular steel tube composite columns filled with steel reinforced concrete)是一种新型组合结构构件,在钢管混凝土组合结构基础上做了进一步发展,通过在柱子四周设置角钢(钢骨),能有效提高柱子的承载能力和延性性能,针对这种新型结构已经做过了大量实验和模拟工作。国内对钢骨—钢管混凝土柱的研究尚少,因此,有必要对其性能进行进一步的研究,以更好的应用于工程实际中。钢骨—钢管混凝土组合柱结构使钢筋混凝土柱与钢管混凝土柱两者有机结合,充分集成二者优点的同时,又有一定发展。在同样承载力条件下,很大程度上减小了构件的截面尺寸,提高了柱子延性同时也提高了其承载能力,有效的提高了框架结构柱的轴压比限值和抗震能力。笔者在试验研究的基础上,通过ABAQUS模拟,研究了含骨率和轴压比不同时对构件承载力和变形能力的影响,为钢骨—钢管混凝土柱的进一步研究和应用提供了理论依据。抗震性能方面,通过对ABAQUS模拟结果的处理,得到了分别以含骨率、轴压比为控制变量下的荷载-位移曲线、强度及刚度退化曲线。通过对比不同轴压比和不同含骨率时得出的数剧,可以得出以下结论：钢骨—钢管混凝土柱表现出了较高的承载能力,柱的破坏属于压弯型破坏,即使在最不利荷载作用下荷载—位移曲线的图形依然非常稳定而没有突变现像,曲线外轮廓饱满而成梭形,无捏缩收拢现象,表现出其较好的耗能能力。通过对含骨变化而得到不同骨架曲线的对比分析得到,含骨率是影响构件承载力的主要因素之随着含骨率的增加,构件承载力得到明显的提生；此外,轴压比也是影响构件骨架曲线的主要因素,轴压比越高时骨架曲线下降段的斜率越大越陡,构件的延性自然就越差,可见过大的轴压比对抗震是非常不利的。抗剪性能方面,现有的一些普通钢筋混凝土构件剪弯试验表明、：当剪跨比大于2时,构件通常会发生由于压、弯、剪作用而导致的纵向钢筋的粘着破坏,伴随着混凝土保护层剥落,进而导致承载能力的迅速下降。而钢管混凝土因钢管的存在使构件抗延性大幅提高,会发生破坏荷载较高的弯曲型破坏而被拉断,且不会有保护层的剥落问题。钢骨—钢管混凝土的力学性能方面与钢管混凝土的有很大相拟之处,所以只进行剪跨比小于等于2时的短柱受剪承载力的研究,通过控制改变含骨率,剪跨比,轴压比,套箍指标来分析变量对柱承载力的变化。国内对钢骨—钢管混凝土柱的研究尚少,因此,有必要对其性能进行进一步的研究,为钢骨—钢管混凝土柱的进一步研究和应用提供了理论依据,以期更好的应用于工程实际中。
[Abstract]:Steel-reinforced concrete filled steel tube column (. Circular steel tube composite columns filled with steel reinforced. Create). It is a new type of composite structure. Based on the composite structure of concrete-filled steel tube (CFST), the bearing capacity and ductility of the columns can be effectively improved by installing angle steel around the columns. A lot of experimental and simulation work has been done for this new structure. There are few researches on steel-reinforced concrete filled steel tube columns in China, so it is necessary to further study its performance. In order to be better applied in engineering practice, the steel-reinforced concrete filled steel tubular column structure makes the reinforced concrete column and the steel tube concrete column combine organically, and fully integrate the advantages of the two at the same time. In the same condition of bearing capacity, the section size of the member is reduced to a great extent, the ductility of the column is improved, and the bearing capacity of the column is also improved. The limit value of axial compression ratio and seismic capacity of frame structure column are improved effectively. Based on the experimental research, the author simulates by ABAQUS. The effects of different ratio of bone and axial compression on the bearing capacity and deformation capacity of the members are studied, which provides a theoretical basis for the further study and application of steel-filled steel tube concrete filled columns. By processing the ABAQUS simulation results, the load-displacement curves with the ratio of bone content and axial compression ratio as control variables are obtained. Strength and stiffness degradation curve. By comparing the different axial compression ratio and different ratio of bone, we can draw the following conclusion: steel steel-filled steel tube concrete column shows high bearing capacity. Even under the most unfavorable load, the pattern of load-displacement curve is still very stable and has no abrupt phenomenon, the contour of the curve is full and fusiform, and there is no squeezing and closing phenomenon. Through the comparison and analysis of different skeleton curves, it is concluded that the ratio of bone is one of the main factors affecting the bearing capacity of components with the increase of bone content. The bearing capacity of the members is obviously increased; In addition, the axial compression ratio is also the main factor affecting the skeleton curve, the higher the axial compression ratio, the bigger the slope of the descending section of the skeleton curve is, and the worse the ductility of the component is. It can be seen that too large axial compression ratio is very unfavorable to earthquake resistance. In terms of shear performance, some existing shear bending tests of reinforced concrete members show that when the shear span ratio is greater than 2:00, the members usually have bending due to compression. The shear failure of longitudinal steel bar is accompanied by the spalling of concrete cover, which leads to the rapid decline of bearing capacity. The ductility of concrete filled steel tube (CFST) is greatly improved because of the existence of steel tube. Bending failure with high failure load will be broken and there will be no peeling off of the protective layer. The mechanical properties of steel-filled steel tubular concrete are closely related to that of concrete filled steel tube. Therefore, the shear bearing capacity of short columns with shear span ratio less than or equal to 2:00 is studied, and the ratio of shear to span and axial compression is controlled by changing the ratio of bone content, shear span ratio and axial compression ratio. The hoop index is used to analyze the variation of the bearing capacity of the column. There is little research on the steel-reinforced concrete filled steel tube column in China, so it is necessary to further study its performance. It provides a theoretical basis for the further research and application of steel-reinforced concrete filled steel tube columns, and is expected to be better applied in engineering practice.
【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】：TU398.9

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