【作者】 赵亮；

【导师】 胡少伟；

【作者基本信息】 重庆大学 ， 土木工程， 2022， 硕士

【摘要】 钢管混凝土结构(Concrete-filled steel tube structure,CFST)作为一种新型的组合结构,因其显著的结构和经济优势,在全球范围内应用广泛。同时,为推广绿色建筑,促进产业转型,发展装配式建筑势在必行,其中柱构件作为工程结构主要的承重构件,攻克柱-柱连接问题,是重中之重。已有研究主要集中于钢筋混凝土结构柱-柱节点和钢结构柱连接,对装配式组合结构柱-柱节点的研究不够深入,本文为进一步推广装配式钢-混组合结构发展,提出一种新型浆锚连接的方钢管混凝土装配柱,进行以下研究。(1)开展了1根整浇钢管混凝土柱和9根浆锚连接方钢管混凝土装配柱的拟静力试验,分别以柱-柱节点配筋率、节点纵筋锚固长度、节点装配部位以及构件轴压比为研究变量,从构件破坏模式、滞回曲线、骨架曲线、延性、刚度退化、承载力退化和耗能性能等方面,全方位较系统地研究了整浇柱与装配柱的抗震性能差异。(2)采用有限元分析软件ABAQUS建立了本文装配柱的分析模型,通过破坏模式和荷载-位移曲线的对比,验证了本文所建立模型的可靠性。鉴于试验所选取任一研究参数(配筋率、锚固长度、轴压比)构件数目有限,因此拓展完成了28根试件的有限元模拟计算,进一步研究了以上变量对装配柱的抗震性能影响。(3)结合试验研究以及有限元分析结果,对本文装配柱的设计方法、构造要求和施工工艺提出建议说明。研究结果表明:装配柱与整浇柱破坏模式类似,采用不同节点构造的装配式试件与整浇试件在滞回曲线、骨架特性和刚度退化等方面差异不大,装配柱的耗能性能和极限承载力优于整浇柱。各装配试件极限位移角为1/16.7～1/25,满足抗震规范设计要求。装配柱节点配筋率的增大有益于提升构件的承载力和延性,装配柱随轴压比增大,承载力提升,延性降低,锚固长度对构件的抗震性能无明显影响。节点装配部位处于非塑性铰区的装配柱,更改连接部位,对装配柱的抗震性能无明显影响,为工程实际将新型节点应用于便于施工、受力安全的反弯点处提供可靠参考。最后,本文综合分析构件加工过程中所遇到的问题、试验数据分析以及所得结论,并结合已有钢管混凝土施工的关键方法,提出了本文浆锚连接方钢管混凝土装配柱的设计方法,优化了节点区构造,完善了施工工艺。更多还原

【Abstract】 Concrete-filled steel tube structure(CFST),as a new type of composite structure,is widely used around the world because of its significant structural and economic advantages.At the same time,in order to promote green buildings and promote industrial transformation,it is very beneficial to develop prefabricated buildings.Among them,column components are the main load-bearing components of the structure,and it is also very important to overcome the problem of column-column connection.Existing research mainly focuses on reinforced concrete structure column-column joints and steel structure column connections,and there are few studies on prefabricated composite structure column-column joints.In order to further promote the development of prefabricated steel-concrete composite structures,this paper proposes a new type of composite structure.The following studies were carried out on the square concrete-filled steel tubular assembly column connected by the grout anchor.(1)A quasi-static test of 1 cast-in-place CFST column and 9 square CFST assembly columns connected by grout anchors was carried out.Taking column-column joint reinforcement ratio,joint longitudinal reinforcement anchorage length,joint assembly position and member axial compression ratio as the research variables,the seismic performance differences between cast-in-place columns and assembled columns are comprehensively and systematically studied,from the aspects of component failure mode,hysteresis curve,skeleton curve,ductility,stiffness degradation,bearing capacity degradation and energy dissipation performance,etc.(2)The finite element analysis software ABAQUS is used to establish the analysis model of the assembly column in this paper.The reliability of the model established in this paper is verified by the comparison of the failure mode and the load-displacement curve.In view of the limited number of members for any research parameter(reinforcing ratio,anchorage length,and axial compression ratio)selected for the test,the number of test pieces is supplemented.The monotonic loading of 28 specimens was completed,and the influence of the above variables on the seismic performance of the assembled column was further studied.(3)Combined with the experimental research and finite element analysis results,suggestions are put forward for the design method,construction requirements and construction technology of the assembly column in this paper.The above research results show that the failure mode of the assembled column is similar to that of the cast-in-place column.The fabricated specimens with different joint structures and the cast-in-place specimen have little difference in hysteresis curve,skeleton characteristics and stiffness degradation.Performance and ultimate bearing capacity are better than monolithic columns.The limit displacement angle of each assembly specimen is 1/16.7～1/25,which meets the design requirements of the seismic code.The increase of the reinforcement ratio of the assembly column node is beneficial to improve the bearing capacity and ductility of the component.With the increase of the axial compression ratio,the bearing capacity of the assembly column increases,but the ductility decreases.The anchorage length has no obvious effect on the seismic performance of the component.For the assembly column where the node assembly part is in the non-plastic hinge area,changing the connection part has no obvious effect on the seismic performance of the assembly column,and provides a reliable reference for the practical application of the new node to the anti-bending point that is convenient for construction and safe under stress.Finally,based on the problems encountered in the process of component processing and the conclusions obtained from the analysis of experimental data,combined with the existing key methods of CFST construction,this paper proposes the design method of the square CFST assembly column connected by grout anchors,and optimizes the structure of the node area.The construction process has been improved.更多还原