【作者】 安培君；

【导师】 李忠献；

【作者基本信息】 天津大学 ， 结构工程， 2009， 硕士

【摘要】 空客A320总装线项目坐落于天津滨海新区,包括总装厂房、动力中心、喷漆机库、机库厂房以及支持服务中心等子项目。其中机库厂房跨度96m,进深92m,下弦标高15m。机库厂房屋盖结构采用主桁架和平面次桁架组成的主次桁架形式,此种结构形式在我国首次应用。主桁架为宽、高均7m的三角形钢管桁架,跨度96m,间距26m。主桁架跨度大,受力复杂,节点采用钢管和节点板通过高强度螺栓相连的形式,为全面掌握节点的受力性能,评价其安全性,本文对主桁架下弦节点的受力性能进行了有限元分析和模型试验。本文首先采用有限元分析软件ANSYS建立下弦节点实体模型,分析节点在设计荷载作用下的受力性能,掌握节点应力分布特点,找出应力集中区域;其次选择下弦受力最不利节点,制作此节点三分之一缩尺模型,对节点模型进行设计荷载以及1.5倍设计荷载作用下的受力性能试验,以验证有限元计算结果的可靠性。试验结果与有限元分析结果吻合较好,表明有限元分析结果是可靠的。有限元分析和模型试验结果均表明,节点在1.5倍设计荷载下,节点仍处于弹性工作状态,节点具有足够的安全性。最后根据有限元分析和模型试验结果,指出了节点的薄弱环节,对节点设计和施工提出了建议,为此类节点的进一步推广和应用提供了理论依据和试验数据。更多还原

【Abstract】 The Airbus 320 Buildings is located in Binhai District, Tianjin. It comprises Final Flight Hangar Building, Dynamic Center, Spray Paint Hangar Building, Post-assembly Flight Hangar Building and Service Center. The dimension of the Post-assembly Flight Hangar Building is 96×92m, and the elevation of the lower chord is 15m. The primary-secondary truss format made up of primary truss and planar secondary truss is employed in the roof structure of the Post-assembly Flight Hangar Building. It is the first practical application of such truss format in China. The primary truss is made up of triangle steel tube truss with a height of 7m and a width of 7m. Its span is 96m and the distance between two of them is 26m. Due to the large span and complex stress of the primary truss, in the joint connection, high strength bolt was used for connecting the steel tube with gusset plate. In order to have a comprehensive knowledge about the mechanical behavior of the joints and estimate their safety, the finite element method analysis and model test of the lower chord joints in the primary truss were all conducted.Firstly, the solid model of the joints were built up using a finite element method (FEM) analysis software—ANSYS. Thereafter, the joints mechanical performance under design load is analyzed, the stress distribution characteristics were concluded and the stress concentration regions were found. Secondly, the joint under the worst-case load was selected to build up a sale model, at a ratio of 1/3. The mechanical performance test of the scale model under 1.5 times design load was conducted. The results obtained from the FEM analysis and the model test coincided very well, which showed that the FEM analysis is reliable.The results get from both the FEM analysis and the model test demonstrate that the join still works in elasticity situation under 1.5 times of design load. Therefore, the safety of the joints was proved.Finally, the weak linkage in the joint was pointed out basing on the FEM analysis and the model test. Some suggestions about the design and construction of such joints were also proposed. The research in this thesis can be used as a theoretical or experimental reference for the application and promotion of this type of joints.更多还原