混凝土折板式密肋拟扁壳的静力性能分析

发布时间：2018-04-10 06:19

本文选题：混凝土　切入点：折板式拟扁网壳　出处：《建筑科学》2017年11期

【摘要】：混凝土折板式密肋壳是由若干块密肋平板在脊(谷)线处交汇而成的新型空间结构,本文以其中的折板式密肋拟扁壳为研究对象,考虑结构矢跨比、脊线刚度、边缘桁架上弦刚度和密肋梁刚度影响,在点支承条件下采用有限元法进行竖向荷载作用下的静力性能分析。结果表明:密肋平板在屋盖中具有拱效应,边缘桁架上弦是屋盖的主要传力构件;屋盖整体刚度随矢跨比提高而增加,过低的矢跨比会增大结构轴力,并显著增加边缘桁架上、下弦的弯矩,建议矢跨比不宜小于1/6;脊线刚度改变几乎不影响结构静力性能,脊线截面高度可取屋盖跨度的1/50~1/30;增大密肋梁刚度能明显提高结构整体刚度,改善脊线和边缘桁架的内力分布,密肋梁截面高度可按结构跨度的1/60~1/35确定;边缘桁架上弦刚度对结构整体刚度和密肋平板内力的影响较小,其截面高度可与脊线截面高度相同。
[Abstract]:The concrete folded plate shell is a new space structure which is composed of several multi-ribbed plates intersecting at the ridge (valley) line. In this paper, the folded plate multi-ribbed pseudo-flat shell is taken as the object of study, considering the rise-to-span ratio of the structure and the stiffness of the ridge line.The finite element method (FEM) is used to analyze the static behavior of edge truss under vertical load under the influence of the stiffness of upper chord and multi-ribbed beam.The results show that the multi-ribbed plate has arch effect in the roof, and the edge truss chord is the main force transfer member of the roof, and the overall stiffness of the roof increases with the rise-span ratio, and the low rise-to-span ratio increases the axial force of the structure and increases the edge truss significantly.For the bending moment of the lower chord, it is suggested that the rise-span ratio should not be less than 1 / 6. The stiffness change of the ridge line has little effect on the static performance of the structure, and the height of the ridge section can take 1 / 50 / 1 / 30 of the span of the roof, and increasing the stiffness of the multi-ribbed beam can obviously improve the overall stiffness of the structure.To improve the internal force distribution of ridges and edge trusses, the cross-section height of multi-ribbed beams can be determined according to 1 / 601/ 35 of the span of the structure, and the upper chord stiffness of edge truss has little effect on the overall stiffness of the structure and the internal force of the multi-ribbed plate, and its cross-section height can be the same as the height of the ridge section.
【作者单位】：贵州大学空间结构研究中心;贵州大学土木工程学院;贵州建工集团第一建筑工程有限公司;
【基金】：国家自然科学基金项目(51568012) 贵州省科学技术基金项目(黔科合J字[2008]2112号)
【分类号】：TU37

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