摘要
为了解斜放网格混凝土拟柱面密肋折板网壳动力特性,采用有限元法计算39个算例,对比了周边支承和拱脚支承屋盖的自振频率与振型,通过有限元参数化分析考虑结构的矢跨比、支座约束、斜向密肋梁刚度、脊线梁刚度、主拱梁刚度、边梁刚度、屋面板厚度对结构自振频率影响。分析表明:与下部结构协同工作时,周边支承对屋盖整体刚度提升较大;矢跨比对屋盖振动基频的影响较小,较大矢跨比会减弱端隔面外刚度,建议矢跨比取1/6~1/4;支座约束对屋盖整体刚度的提升很大;提高斜向肋刚度有利于提高屋盖整体刚度,建议斜向肋截面高度取屋盖跨度的1/60~1/45;脊线梁截面刚度在屋盖的整体刚度中贡献较小,建议脊线的截面高度按构造确定;主拱刚度对屋盖整体刚度贡献较大,建议主拱截面高度取屋盖跨度的1/51~1/40;边梁刚度在整体结构中贡献不大,可取边梁跨度的1/20~1/15为边梁的截面高度;屋面板作为结构刚度储备在满足使用标准的情况下不应取值过大。
To understand the quasi diagonal grid concrete ribbed cylindrical shell flap dynamic characteristics mesh,39 examples were calculated using the finite element method.The natural vibration frequencies and modes of the surrounding supporting and arch supporting roofs were compared.Through the finite element parametric analysis,the influences of the ratio of beam to span,bearing constraints,oblique multi-ribbed beam stiffness,ridge beam stiffness,main arch beam stiffness,side beam stiffness and roof plate thickness on the natural vibration frequency of the structure were investigated.The results show that:In consideration of constraints on the overall configuration of the ridgeline to enhance the overall stiffness larger roof;vector roof span less than the effect on the fundamental frequency of vibration,large span ratio will weaken the stiffness of the outer surface of the end compartment,recommendations span ratio takes 1/6 to 1/4;abutment constraint greatly enhance the overall stiffness of the roof;oblique ribs increase the stiffness improve the overall stiffness of the roof,it is recommended to take an oblique section height of the ribs of a roof span 1/60~1/45;ridgeline section stiffness in the overall stiffness of the roof beam of a small contribution,recommended cross-sectional height of the ridge line is determined by the configuration;main arch stiffness contributed greatly to the overall stiffness of the roof,the main arch recommendations section height taken roof span 1/51~1/40;The side beam stiffness has little contribution to the overall structure,and the 1/20~1/15 of the side beam span is the height of the side beam;roof storage structure as rigidity meet the criteria the value should not be too large in the case.
作者
朱锐
张华刚
陈寿延
姜岚
唐攒辉
ZHU Rui;ZHANG Huagang;CHEN Shouyan;JIANG Lan;TANG Zanhui(Space Structures Research Center,Guizhou University,Guiyang 550003,China;Department of Architecture and Environmental Engineering,Guangdong Institute of Water Resources and Electric Power,Guangzhou 510635,China;School of Civil Engineering,Hunan University,Changsha 410012,China)
出处
《贵州大学学报（自然科学版）》
2019年第6期83-91,共9页
Journal of Guizhou University:Natural Sciences
基金
国家自然科学基金项目资助(51568012)
关键词
混凝土
斜放网格密肋折板网壳
支座约束
共同工作
动力特性
参数分析
concrete
inclined grid folded-plated ribbed shell
bearing constraints
joint work
dynamic characteristics
parametric analysis
