【作者】 李俊生；

【导师】 丁阳；

【作者基本信息】 天津大学 ， 结构工程， 2009， 硕士

【摘要】 节点是构成结构的重要基本单元,起着连接汇交杆件、传递荷载的作用。空客A320总装线项目坐落于天津滨海新区,其机库厂房跨度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为首次应用。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,本文对机库厂房主桁架上弦节点的受力性能进行了有限元分析和模型试验。本文采用有限元分析软件ANSYS建立上弦节点实体模型,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征,找出应力集中区域;根据有限元分析结果,选择上弦受力最不利节点,进行1/3缩尺模型模型试验,分析节点模型在设计荷载以及1.3倍设计荷载作用下的受力性能,验证有限元分析结果的可靠性和节点的安全性。试验结果与有限元分析结果基本吻合,表明有限元分析结果可靠。有限元分析结果表明,节点应力分布比较均匀,受力性能良好。节点模型试验结果表明,在1.3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。本文所做研究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】 Joint is one of the most important parts in the whole structure, which is used to connect members and transmit forces.The project for Airbus A320 is located in the Binhai District, Tianjin. The horizontal dimension of the Flight Hangar Building is 96×92m, and the elevation of the lower chord is 15m. The roof structure of the flight hangar is designed as a complicated truss, which is characterized by the combination of main truss and secondary truss. It’s the first application of this structure form in China. The main truss is a triangle steel tube truss, which is 7m high and 7m wide. The span of main trusses is 96m and the distance between any two of them is 26m. In upper chord joints, the steel tubes and gusset plates are connected by high strength friction grip bolts. In order to know the mechanical properties of the joint pattern well and accurately evaluate the reliability, a numerical analysis and a model experiment for the joint in the upper chord of the main truss are carried out, and the results are presented in this thesis.A numerical solid model of the joint is built in the finite element analysis software ANSYS, and the design loads are applied in the model. The general bearing capacity and stress distribution are studied, which can reflect the locations of stress concentration. On the other hand, an experiment of 1/3 scaled model is conducted, and the mechanical performances of the joint under both design loads and 1.3 times amplified loads are investigated. In general, the results of the experiment agree with that of the numerical analysis, which verifies the reliability and accuracy of the numerical analysis.The results of the finite element analysis indicate that the stress in joint is well distributed and the mechanical performance of the joints is good. In the model experiment, it is found that the joint still behave elastically under 1.3 times of design loads, by which, the safety capability of the joint is verified. This research work contributes to some theoretical conclusion and experimental data, which are significantly important for the promotion and application of the proposed new joint pattern.更多还原