单层椭圆抛物面网壳结构非线性整体稳定研究-《郑州大学学报(工学版)》

文章信息/Info

Title:: Study on nonlinear overall stability of single-layer elliptical paraboloid gridshell structure

作者:: 车伟; 李海旺; 罗奇峰.; 同济大学,结构工程与防灾研究所,上海,200092, 太原理工大学,土木系,山西,太原,030024, 同济大学,上海防灾救灾研究所,上海,200092

Keywords:: structural engineering; single-layer elliptical parabolic mesh shell; Nonlinear stability; Ultimate bearing capacity

摘要:: 以具有实际工程意义的30 m×30 m跨度的单层椭圆抛物面网壳为研究对象,利用ABAQUS有限元程序对网壳的非线性整体稳定性能进行系统的分析,同时考虑矢跨比、初始几何缺陷、约束条件等因素对该网壳稳定性的影响.考察网壳的屈曲模态、屈曲路径,求出了全过程曲线和极限稳定承载力,全面了解单层椭圆抛物面网壳整体非线性失稳的规律性.研究表明:网壳极限承载力随着结构矢跨比的增加而逐渐增大;对竖向荷载的不对称分布和初始几何缺陷比较敏感,半跨竖向的屈曲荷载仅为满跨竖向的70%;支座刚度的增大可适当提高网壳的极限承载力.

Abstract:: Taking a single-layer elliptical parabolic grid shell with a span of 30 m× 30 m with practical engineering significance as the research object, the nonlinear overall stability performance of the grid shell was systematically analyzed by ABAQUS finite element program, and the influence of vector span ratio, initial geometric defects, constraints and other factors on the stability of the grid shell was considered. The buckling mode and buckling path of the grid shell were investigated, the whole process curve and ultimate stable bearing capacity were obtained, and the regularity of the overall nonlinear instability of the single-layer elliptical parabolic grid shell was comprehensively understood. The results show that the ultimate bearing capacity of the mesh shell gradually increases with the increase of the sagittal span ratio of the structure. It is sensitive to the asymmetric distribution and initial geometric defects of vertical loads, and the buckling load in the half-span vertical direction is only 70% of the full-span vertical load. The increase of the stiffness of the support can appropriately increase the ultimate bearing capacity of the grid shell.