【作者】 陈旭；

【导师】 李天；

【作者基本信息】 郑州大学 ， 结构工程， 2020， 硕士

【摘要】 随着国家对“绿色建筑”“建筑工业化”的大力提倡,越来越多的装配式建筑出现在人们的视野中。钢结构作为天然的可装配式结构,在装配式建筑中被广泛使用。在钢结构设计过程中,节点连接设计尤其是梁柱节点设计占有很重要的地位,研究梁柱节点受力性能是保障钢结构在各种作用下安全性的重要内容。装配式钢结构集成楼盖系统以桁架梁作为主要受力构件,相对于实腹式型钢梁具有钢材用量少,建筑管线易从桁架梁内部通过,可以提高建筑室内高度等诸多优势。桁架梁与柱连接节点则是这种结构体系的关键部位,是对这种结构体系研究的重点之一。本文以实际工程为背景,对一种装配式集成楼盖系统的桁架梁-柱螺栓连接节点形式进行了试验研究和数值分析。论文对该梁柱节点在荷载作用下传力途径、变形特点、破坏模式、极限承载力及其关键受力部位等方面进行了研究。通过有限元分析研究了节点连接肋板和端板厚度参数对该梁柱装配式节点受力性能的影响,确定合适的取值范围。通过开缺口杆件拉压试验和有限元对由于高强螺栓安装需要在桁架弦杆局部开缺对杆件承载力造成的影响及所采用的补强措施的有效性进行了分析。本文得到主要结论如下:(1)本文所研究的桁架梁柱连接节点传力途径明确,但传力环节较多,容易造成一些安装间隙。(2)肋板与端板间角焊缝和肋板抗拉强度对上弦节点连接性能影响较大,连接焊缝和肋板尺寸参数设计可按照端板刚度较大的假定下传力模式进行计算,应对中部肋板的连接焊缝以及肋板本身的承载力予以加强或对两边侧肋板进行折减。(3)为了保证承受弦杆所传递压力,对受压部位肋板的宽厚比应控制满足达到塑性传力的需要。端板厚度可以按受三面支承板,按受压强度承载力的要求确定其厚度。(4)对于桁架弦杆考虑安装要求的开缺口部分应当予以加强,采用补强板补强除应当满足双向偏心受弯强度要求外,补强板还应当满足传力的延伸长度要求。本文针对试验研究和有限元分析的结果,对于连接的关键受力部位提出了设计建议,对桁架梁柱连接的构造提出了要求,可为该装配式集成楼盖系统钢桁架梁柱节点工程应用提供参考。更多还原

【Abstract】 With the national strong promotion of "green building" and "building industrialization",more and more prefabricated buildings appear in people’s field of vision.As a natural assemblable structure,steel structure is widely used in prefabricated buildings.In the process of steel structure design,joint design,especially beam-column joint design,occupies a very important position.It is important to study the mechanical properties of beam-column joints to ensure the safety of steel frame structures under various actions.The steel truss beam is used as the main stressed member in the fabricated steel structure integrated floor system.Compared with the solid web steel beam,the truss beam has many advantages,such as less steel consumption,the construction pipeline is easy to pass through the interior of the truss beam,and can improve the indoor height of the building.The joint of truss beam and column is the key part of this kind of structure system.It is one of the key points of this structural system research.In this paper,based on the background of practical engineering,experimental research and numerical analysis are carried out on the joint form of truss beam-column bolt connection for an assembly integrated floor system.In this paper,the load transfer path,deformation characteristics,failure mode,ultimate bearing capacity and key stress parts of the beam-column joint under load are studied.The influence of the thickness parameters of the joint rib plate and end plate on the mechanical performance of the beam-column fabricated joint is studied by finite element analysis,and the appropriate value range is determined.Through the tension and compression test of the notched member and the finite element method,the influence of the local opening of the truss chord due to the installation of high strength bolts on the bearing capacity of the member and the effectiveness of the reinforcement measures adopted are analyzed.The main conclusions of this paper are as follows:(1)The truss beam-column joints studied in this paper have a clear way of force transfer,but there are many force transfer links,which is easy to cause some installation gaps.(2)The fillet weld between the rib plate and the end plate and the tensile strength of the rib plate have a great influence on the connection performance of the upper chord joint.The design of the size parameters of the joint weld and rib plate can be calculated according to the hypothetical force transfer mode with large stiffness of the end plate.The joint weld of the middle rib plate and the bearing capacity of the rib plate itself should be strengthened or the rib plates on both sides should be reduced.(3)In order to be able to bear the pressure transmitted by the chord,the widthto-thickness ratio of the ribbed plate in the compression part should be controlled to meet the need of plastic force transfer.The thickness of the end plate can be determined according to the three-sided supporting plate and the bearing capacity of the compressive strength.(4)The notched part of the truss chord considering the installation requirements should be strengthened,and the reinforcement plate should not only meet the requirements of two-way eccentric bending strength,but also meet the requirements of the extension length of force transmission.Based on the results of experimental research and finite element analysis,this paper puts forward some design suggestions for the key stress parts of the connection and the requirements for the construction of truss beam-column connections.it can provide reference for the engineering application of steel truss beam-column joints in the assembled integrated floor system.更多还原