钢管再生混凝土柱-H型钢梁外加强环式节点抗震性能研究

发布时间：2018-10-11 07:11

【摘要】：当前在国家“节能减排”、“绿色环保”的发展方针的指导下,建筑废弃物的处理问题已经成为关乎可持续发展需要迫切解决的重要问题。再生混凝土技术的出现,既解决了废弃混凝土难处理的问题,满足当代社会对混凝土的需求,同时又节约天然骨料资源,缓解骨料供求矛盾,有利于保护环境,是一种绿色混凝土。为解决再生混凝土所存在的容易开裂、强度较低、弹性模量较差等问题,参考钢管混凝土结构的形式,发展出钢管再生混凝土结构结构。钢管再生混凝土柱与钢梁之间的节点连接是整个钢管再生混凝土组合结构体系中最为重要的部分,其在钢管再生混凝土框架结构中起着分配内力、传递弯矩并且具有保证结构整体稳定性的作用,特别是当结构经历较大地震而进入屈服阶段后,梁柱节点连接对组合结构的整体性和稳定性起着至关重要的作用。论文以钢管再生混凝土柱-H型钢梁外加强环式节点为研究对象,重点研究了其在低周往复荷载作用下的抗震性能,并找出影响其抗震性能的主要因素,以及针对钢管混凝土梁柱节点现阶段应用中所存在的问题进行优化、改进。主要研究内容如下:(1)依据实际工程设计,按照1:2缩尺比例设计7个缩尺比例模型,主要考虑的影响因素有:轴压比、梁柱线刚度比、再生混凝土楼板组合作用、压型钢板再生混凝土组合楼板及核心区高强螺栓对节点抗震性能的影响。(2)利用所测数据绘制梁端滞回曲线、骨架曲线、刚度退化曲线、强度退化曲线等图表,分析其耗能能力、延性系数、等效粘滞阻尼系数等抗震指标,为钢管再生混凝土结构在工程实践中的运用打下坚实的基础。(3)利用A N S Y S有限元软件建立精细的三维有限元模型,对试验中未能考虑完整的工况进行数值模拟分析,最后将数值模拟结果与试件结果进行对比分析,找寻变化规律。试验结果表明,试件滞回曲线饱满,耗能能力较强。梁柱线刚度比对试件极限承载力及耗能能力有显著影响,对节点抗震性能影响较大;柱轴压比变化对试件承载力有影响但影响不明显,轴压比增大会导致试件极限承载力稍有降低,同时试件的延性也有所降低;高强螺栓能够有效地降低核心区剪切应变,但对提升试件极限承载力及耗能能力作用不明显。
[Abstract]:At present, under the guidance of the development policy of "energy saving and emission reduction" and "green environmental protection", the disposal of construction waste has become an important problem that needs to be solved urgently for sustainable development. The emergence of recycled concrete technology not only solves the difficult problem of waste concrete, meets the demand for concrete in contemporary society, but also saves the natural aggregate resources, alleviates the contradiction between aggregate supply and demand, and is beneficial to the protection of the environment. It's a green concrete. In order to solve the problems such as easy cracking, low strength and poor elastic modulus of recycled concrete, the recycled concrete filled steel tube structure was developed with reference to the form of concrete filled steel tubular structure. The joint connection between recycled concrete filled steel tubular column and steel beam is the most important part of the whole composite structure system of recycled concrete filled steel tube, which plays an important role in the distribution of internal force in the recycled concrete filled steel tube frame structure. The transmission of bending moment has the function of guaranteeing the overall stability of the structure. Especially when the structure goes through a large earthquake and enters the yield stage the Liang Zhu joint connection plays an important role in the integrity and stability of the composite structure. This paper focuses on the seismic behavior of steel tubular recycled concrete column-H-type steel beams with external reinforced ring joints under low cycle reciprocating loads, and finds out the main factors that affect its seismic performance. The problems existing in the application of concrete-filled steel tubular joint Liang Zhu are optimized and improved. The main research contents are as follows: (1) according to the actual engineering design, seven scale models are designed according to the 1:2 scale ratio. The main influencing factors are as follows: axial compression ratio, Liang Zhu line stiffness ratio, combined action of recycled concrete floor slab, etc. The influence of high strength bolts on the seismic performance of composite concrete composite slab and core area of profiled steel sheet. (2) the hysteretic curve, skeleton curve, stiffness degradation curve and strength degradation curve of beam end are drawn by using the measured data, and the energy dissipation capacity is analyzed. The ductility coefficient, equivalent viscous damping coefficient and other seismic indexes lay a solid foundation for the application of recycled concrete filled steel tube structure in engineering practice. (3) the fine three-dimensional finite element model is established by using A N S Y S finite element software. At last, the numerical simulation results are compared with the results of the specimen to find out the law of change. The experimental results show that the hysteretic curve of the specimen is full and the energy dissipation ability is strong. Liang Zhu's line stiffness ratio has significant influence on ultimate bearing capacity and energy dissipation capacity of specimens, and has great influence on the seismic behavior of joints, while the change of axial compression ratio of columns has an effect on the bearing capacity of specimens, but the influence is not obvious. The increase of axial compression ratio leads to a slight decrease in ultimate bearing capacity and the ductility of the specimen, and high strength bolts can effectively reduce the shear strain in the core area, but the effect on the ultimate bearing capacity and energy dissipation capacity of the specimen is not obvious.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11

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