大跨度异型钢桁架安装过程试验研究与数值分析

发布时间：2018-09-17 15:57

【摘要】：大型空间结构建造过程中施工技术是至关重要的,方案选择不合理会对结构造成过大的初始应力损伤,进而对结构产生严重安全隐患,因此,选择合理施工方案和科学分析才能保证结构的安全。本文以甘肃会展中心建筑群项目钢结构安装为背景,通过对大跨度异型钢桁架安装过程中各杆件的数值分析和试验研究,总结出钢桁架在施工过程中的杆件应力及位移分布规律,保证了安装过程的安全,避免了过大的初始应力损伤,实现了联机控制安装过程,主要研究内容如下: 1)综合评述了大跨度异型钢结构的应用和发展情况,回顾了国内外对空间结构施工过程监测和理论分析的研究现状,总结了以往研究所取得的积极成果以及存在的不足; 2)应用ANSYS非线性分析功能,建立了钢桁架三维有限单元模型,计算了其吊点数量分别为2、4、6、8、10、12六种方案的杆件应力、位移分布规律,最终优化评定出最合理的8吊点吊装方案; 模拟分析了支座安装时钢桁架的应力、位移分布规律,用以控制施工的初始应力损伤情况; 3)现场实测在吊装阶段和临时固定阶段两榀钢桁架主要受力杆件上弦杆、腹杆、下弦杆应力值,并将结果实时传输给联机控制软件(由毕文萍同学编写),以控制杆件应力的最大值; 4)最后,将钢桁架施工前的数值计算优化结果与施工时的现场试验实测值进行对比分析,得到钢桁架在吊装阶段和临时固定阶段各杆件应力分布曲线,总结应力分布规律,对今后类似钢桁架施工及设计工作提出了建议。
[Abstract]:The construction technology is very important in the construction process of large space structure. The unreasonable selection of the scheme will cause excessive initial stress damage to the structure, and then cause serious hidden danger to the structure. Selection of reasonable construction scheme and scientific analysis can ensure the safety of the structure. In this paper, based on the steel structure installation of Gansu Convention and Exhibition Center, the numerical analysis and experimental study of the members during the installation process of large-span steel truss are carried out. The stress and displacement distribution of steel truss during construction is summarized, which ensures the safety of installation process, avoids excessive initial stress damage, and realizes on-line control installation process. The main research contents are as follows: 1) the application and development of large-span profiled steel structures are comprehensively reviewed, and the research status of monitoring and theoretical analysis of the construction process of space structures at home and abroad is reviewed. This paper summarizes the positive achievements and shortcomings of the previous research. 2) using the nonlinear analysis function of ANSYS, the three-dimensional finite element model of steel truss is established. Finally, the most reasonable lifting scheme of 8 hoisting points is optimized, and the stress and displacement distribution of steel truss is simulated and analyzed. It is used to control the initial stress damage of the construction. 3) the stress values of the two main steel truss members in the hoisting stage and the temporary fixing stage are measured in the upper chord, the web bar and the lower chord of the steel truss. The results are transmitted to the on-line control software (written by Bi Wenping) in real time to control the maximum stress of the members. 4) finally, By comparing and analyzing the results of numerical calculation and optimization before construction of steel truss and the field test results during construction, the stress distribution curves of steel truss members in hoisting and temporary fixing stages are obtained, and the stress distribution law is summarized. Suggestions for construction and design of similar steel truss in the future are put forward.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TU392.1

【引证文献】