【作者】 张勇；

【导师】 袁波；

【作者基本信息】 贵州大学 ， 结构工程， 2019， 硕士

【摘要】 为了适应钢-混凝土组合梁装配化发展的需求,本文提出了一种应用高强螺栓作为抗剪构件的新型装配式组合梁。由于螺栓连接件是保证该组合梁协同工作的关键元件,为了了解该连接件抗剪性能,基于大型通用有限元软件ABAQUS建立其推出试验试件有限元模型,研究其抗剪极限承载力影响因素;另通过建立新型装配式组合梁整梁有限元模型,探究了抗剪连接程度和混凝土强度对其抗弯性能影响,为以后试验研究和应用提供参考。主要工作与结论如下:(1)详细介绍了新型装配式组合梁结构构造,并将这种组合梁与传统组合梁进行对比。对比结果说明:该组合梁优势在于可实现完全装配化施工,有利于节约成本;并且由于所有构件可工厂化预制使其质量能得到有效保证。(2)通过ABAQUS建立新型装配式组合梁螺栓连接件推出试件有限元模型,探究螺栓直径、螺栓间距、螺栓数量及混凝土强度对于该连接抗剪性能影响。研究结果表明:螺栓连接件极限承载力随螺栓直径的增大而增大;增大螺栓间距能在一定程度提升连接件极限承载力;增加螺栓数量能提升螺栓连接件极限承载力,但极限承载力不是随螺栓数量增加成比例增大;混凝土强度对于连接件极限承载力影响并不明显。(3)详细介绍了组合梁弹性和塑性设计理论及剪力连接件设计方法,在此基础上设计了一根新型装配式组合梁。通过塑性理论计算在完全抗剪连接下该组合梁抗弯承载力及达到完全抗剪连接时所需连接件个数并和传统连接件进行对比。计算结果表明:达到完全抗剪连接时,所需新型装配式螺栓连接件数量远小于传统栓钉连接件,采用新型连接件更加经济。(4)按照设计的新型装配式组合梁尺寸应用ABAQUS建立其有限元模型,探究抗剪连接程度和混凝土强度对于该组合梁抗弯性能影响,研究表明:抗剪连接程度的提升能降低组合梁交界面滑移并提高其抗弯承载力;混凝土强度对于组合梁抗弯承载力及交界面滑移影响不大。更多还原

【Abstract】 In order to meet the needs of the assembly development of steel-concrete composite beams,this paper proposes a new type of fabricated composite beams using high-strength bolts as shear members.Since the bolted joint is the key component to ensure the cooperative work of the composite beam,in order to understand the shear resistance of the joint,the finite element model of the test specimen is established based on the large-scale general finite element software ABAQUS,and the influencing factors of the shear ultimate bearing capacity are studied.In addition,through the establishment of a new type of assembled composite beam finite element model,the influence of the degree of shear joint and the strength of concrete on its bending performance is explored,which provides reference for future experimental research and application.The main work and conclusions are as follows:(1)The structure of the new assembled composite beam is introduced in detail,and it is compared with the traditional composite beam.The comparison results show that the advantage of the composite beam is that it can realize complete assembly construction,so that is conducive to cost saving;and,considering all components can be factory prefabricated,the quality can be effectively guaranteed.(2)The finite element model of Push-out Test of the bolt joints in the new type of assembled composite beam was established by ABAQUS,and the influence of bolt diameter,bolt spacing,bolt quantity and concrete strength on the shear performance of the joint was investigated.The research results show that the ultimate bearing capacity of the bolted joint increases with the increase of the bolt diameter;increasing the bolt spacing can increase the ultimate bearing capacity of the joint to a certain extent;increasing the number of bolts can increase the ultimate bearing capacity of the bolted joint,but the ultimate bearing capacity does not increase proportionally with the increase in the number of bolts;what’s more,the strength of the concrete does not significantly affect the ultimate bearing capacity of the joint.(3)The elastic and plastic design theory of composite beams and the design method of shear connectors are introduced in detail.On this basis,a new type of fabricated composite beams is designed and the bending capacity of the composite beams and the number of connectors are calculated by plastic theory under full shear connection.The calculation results show that when the full shear connection is reached,the number of new assembled bolt connectors required is much smaller than that of the traditional stud connectors,and the new connector is more economical.(4)According to the design of new assembled composite beam,the finite element model of that is established by ABAQUS,and the influence of the degree of shearing resistance of shear joint and concrete strength on the bending resistance of the composite beam is explored.The research shows that the improvement of the degree of shearing resistance of shear joint can reduce the slip of the interface of the composite beam and improve its capacity of bending resistance;yet,the strength of concrete has little effect on the bending capacity of the composite beam and interface slip.更多还原