方钢管再生混凝土框架结构的抗震性能研究
发布时间：2018-10-12 07:47
【摘要】：再生混凝土作为一种新型环保建筑材料具有重要的社会效益和经济效益,然而其内部骨料缺陷导致它的力学性能和常规混凝土相比存在一定的差别。钢管再生混凝土利用钢管对再生混凝土的约束作用弥补了再生混凝土的内在缺陷,但是目前对于钢管再生混凝土抗震相关的研究多集中于构件层面,对于钢管再生混凝土框架整体的研究较为鲜见。本文首先研究了再生混凝土基本性能,然后通过利用有限元软件ABAQUS建立方钢管再生混凝土框架结构有限元模型,来研究此类结构抗震性能。具体内容如下:(1)在已有试验缩尺试件KJ-2的基础上,建立了方钢管再生混凝土框架有限元基本模型,研究了结构在反复荷载下的抗震性能,并与试验结果作了对比,以验证有限元方法的准确性。结果表明:有限元方法很好的模拟了结构的滞回性能、骨架曲线、刚度退化、破坏形态及受力过程;框架的塑性铰首先在梁端产生,随着加载的继续进行框架柱在柱根发生屈服,且破坏时节点核心区钢管没有形成屈服面,满足“强柱弱梁”的设计要求。(2)在反复荷载作用下,分别考虑钢管再生混凝土的再生粗骨料取代率、轴压比、钢管内再生混凝土的强度等级、方钢管的屈服强度及钢管的厚度五个系列参数的变化对方钢管再生混凝土框架抗震性能的影响。结果表明:方钢管再生混凝土框架的滞回曲线饱满,破坏时不同模型的等效粘滞阻尼系数均大于0.2,具有良好的耗能能力;随着再生粗骨料取代率的提高,方钢管再生混凝土框架模型的水平承载力及初始刚度均有所降低,但降低的程度不是特别明显,框架的延性系数没有随取代率的变化表现出明显的规律,不同取代率的框架模型位移延性计算值介于3.35~3.43之间,故设计时只需适当予以考虑;轴压比越高,柱脚钢管发生屈服越早,这使得方钢管再生混凝土框架结构的水平承载力及延性退化加快,当柱子的轴压比取0.4~0.5之间时,框架的抗震性能可以得到有效发挥;提高钢管内再生混凝土的强度等级,有益于提高框架的承载力及初始刚度,但与此同时框架的延性及耗能能力却出现退化,因此在实际工程中应综合考虑来设置钢管内再生混凝土的强度等级;随着方钢管钢材屈服强度的提高,方钢管对内填再生混凝土的约束作用增强,使得框架模型的刚度、水平承载力均有明显提升,但框架的延性会变差,故在设计时不宜使用屈服强度过高的钢材;柱钢管厚度的增加可明显提高框架的承载力及刚度,且在一定范围内,框架的延性随着钢管厚度的增加而提高,当钢管厚度超过6mm时,框架的延性又出现降低的趋势,这说明设计时应合理设置柱钢管的厚度。
[Abstract]:Recycled concrete as a new type of environmental protection building material has important social and economic benefits, but its internal aggregate defects lead to some differences between its mechanical properties and conventional concrete. Recycled concrete filled steel tube (CFST) makes up for the inherent defects of recycled concrete by the restriction of steel tube to recycled concrete, but the research on seismic resistance of recycled concrete filled steel tubular (CFST) is mostly focused on the component level. The whole research of recycled concrete filled steel tube frame is rare. In this paper, the basic properties of recycled concrete are studied firstly, and then the seismic behavior of this kind of structure is studied by using finite element software ABAQUS to establish the finite element model of recycled concrete filled steel tube frame structure. The main contents are as follows: (1) on the basis of KJ-2, the basic finite element model of recycled concrete filled square steel tube frame is established, and the seismic behavior of the structure under repeated load is studied, and the results are compared with the experimental results. To verify the accuracy of the finite element method. The results show that the finite element method can well simulate the hysteretic behavior of the structure, skeleton curve, stiffness degradation, failure form and stress process, and the plastic hinge of the frame is first produced at the end of the beam. As the loading continues, the frame columns yield at the root of the column, and when the failure occurs, the steel pipe in the core zone of the joint does not form a yield surface, which meets the design requirements of "strong column and weak beam". (2) under repeated loads, The replacement ratio of recycled coarse aggregate, axial compression ratio and strength grade of recycled concrete in steel tube are considered respectively. Variation of yield strength and Steel Tube thickness of Square Steel Tube the effect of seismic behavior of recycled concrete filled steel tube frame on seismic behavior is discussed. The results show that the hysteretic curve of recycled concrete filled square steel tube frame is full, and the equivalent viscous damping coefficient of different models is more than 0.2, which has good energy dissipation capacity, and with the increase of the replacement ratio of recycled coarse aggregate, the equivalent viscous damping coefficient of different models is more than 0.2. The horizontal bearing capacity and initial stiffness of square steel tube recycled concrete frame model are decreased, but the degree of reduction is not particularly obvious. The ductility coefficient of the frame does not show obvious regularity with the change of substitution rate. The calculated displacement ductility of the frame model with different replacement ratio is between 3.35 and 3.43, so it should be considered properly in design. The higher the axial compression ratio, the earlier the steel tube yield at column foot. As a result, the horizontal bearing capacity and ductility degradation of square steel tube recycled concrete frame structure are accelerated. When the axial compression ratio of column is between 0.4 and 0.5, the seismic behavior of the frame can be effectively displayed, and the strength grade of recycled concrete in steel tube can be improved. It is beneficial to improve the bearing capacity and initial stiffness of the frame, but at the same time, the ductility and the energy dissipation capacity of the frame are degraded. Therefore, the strength grade of recycled concrete in steel tube should be comprehensively considered in practical engineering. With the increase of steel yield strength of square steel tube, the restraint effect of square steel tube on reclaimed concrete is enhanced, so that the stiffness and horizontal bearing capacity of frame model are improved obviously, but the ductility of frame becomes worse. Therefore, steel with high yield strength should not be used in the design, the bearing capacity and stiffness of the frame can be obviously improved by increasing the thickness of the column steel pipe, and the ductility of the frame increases with the increase of the steel pipe thickness in a certain range. When the thickness of steel pipe exceeds 6mm, the ductility of the frame decreases again, which indicates that the thickness of column steel pipe should be reasonably set in design.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11
本文编号：2265346
[Abstract]:Recycled concrete as a new type of environmental protection building material has important social and economic benefits, but its internal aggregate defects lead to some differences between its mechanical properties and conventional concrete. Recycled concrete filled steel tube (CFST) makes up for the inherent defects of recycled concrete by the restriction of steel tube to recycled concrete, but the research on seismic resistance of recycled concrete filled steel tubular (CFST) is mostly focused on the component level. The whole research of recycled concrete filled steel tube frame is rare. In this paper, the basic properties of recycled concrete are studied firstly, and then the seismic behavior of this kind of structure is studied by using finite element software ABAQUS to establish the finite element model of recycled concrete filled steel tube frame structure. The main contents are as follows: (1) on the basis of KJ-2, the basic finite element model of recycled concrete filled square steel tube frame is established, and the seismic behavior of the structure under repeated load is studied, and the results are compared with the experimental results. To verify the accuracy of the finite element method. The results show that the finite element method can well simulate the hysteretic behavior of the structure, skeleton curve, stiffness degradation, failure form and stress process, and the plastic hinge of the frame is first produced at the end of the beam. As the loading continues, the frame columns yield at the root of the column, and when the failure occurs, the steel pipe in the core zone of the joint does not form a yield surface, which meets the design requirements of "strong column and weak beam". (2) under repeated loads, The replacement ratio of recycled coarse aggregate, axial compression ratio and strength grade of recycled concrete in steel tube are considered respectively. Variation of yield strength and Steel Tube thickness of Square Steel Tube the effect of seismic behavior of recycled concrete filled steel tube frame on seismic behavior is discussed. The results show that the hysteretic curve of recycled concrete filled square steel tube frame is full, and the equivalent viscous damping coefficient of different models is more than 0.2, which has good energy dissipation capacity, and with the increase of the replacement ratio of recycled coarse aggregate, the equivalent viscous damping coefficient of different models is more than 0.2. The horizontal bearing capacity and initial stiffness of square steel tube recycled concrete frame model are decreased, but the degree of reduction is not particularly obvious. The ductility coefficient of the frame does not show obvious regularity with the change of substitution rate. The calculated displacement ductility of the frame model with different replacement ratio is between 3.35 and 3.43, so it should be considered properly in design. The higher the axial compression ratio, the earlier the steel tube yield at column foot. As a result, the horizontal bearing capacity and ductility degradation of square steel tube recycled concrete frame structure are accelerated. When the axial compression ratio of column is between 0.4 and 0.5, the seismic behavior of the frame can be effectively displayed, and the strength grade of recycled concrete in steel tube can be improved. It is beneficial to improve the bearing capacity and initial stiffness of the frame, but at the same time, the ductility and the energy dissipation capacity of the frame are degraded. Therefore, the strength grade of recycled concrete in steel tube should be comprehensively considered in practical engineering. With the increase of steel yield strength of square steel tube, the restraint effect of square steel tube on reclaimed concrete is enhanced, so that the stiffness and horizontal bearing capacity of frame model are improved obviously, but the ductility of frame becomes worse. Therefore, steel with high yield strength should not be used in the design, the bearing capacity and stiffness of the frame can be obviously improved by increasing the thickness of the column steel pipe, and the ductility of the frame increases with the increase of the steel pipe thickness in a certain range. When the thickness of steel pipe exceeds 6mm, the ductility of the frame decreases again, which indicates that the thickness of column steel pipe should be reasonably set in design.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11
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