建筑钢结构进展2020，Vol.22Issue(5)：64-77,92,15.DOI:10.13969/j.cnki.cn31-1893.2020.05.007
考虑杆件缺陷的双层焊接球柱面网壳稳定性研究
Stability Analysis of Double-Layer Cylindrical Reticulated Shell with Welded Spherical Nodes Considering Member Imperfection
摘要
Abstract
The load-carrying capacity of double-layer cylindrical reticulated shell is usually determined by the buckling of members,and the imperfection of member has a major influence on member buckling load.The effect of member imperfection,nodal deviation and their couplings on load-carrying capacity of double-layer cylindrical reticulated shells with different rise-to-span ratios and grid numbers are systematically investigated in this study.Furthermore,the method to determine the most unfavorable distribution of member imperfection is developed.Based on the analysis results,the imperfections in member (e.g.,initial curvature of member,residual stress) can be equivalent to member bow imperfection.The shape can be treated as a half-sine curve,and the amplitude can be taken asl/400,which is on the safe side.The effect of member imperfection on load-carrying capacity of reticulated shell is closely related to rise-to-span ratio and grid number of reticulated shell.The reticulated shell with larger rise-to-span ratio and slenderness ratio is more sensitive to member imperfection.In the design of real structure,member imperfection must be considered.Otherwise,the load-carrying capacity will be overestimated.The load-carrying capacity of imperfect reticulated shell is apparently influenced by bending direction of bow imperfection.Form4 is the most unfavorable distribution of bow imperfection for all cases considered.Furthermore,the ultimate loading of reticulated shell with Forml of bow imperfection,which is obtained by the modified consistent imperfection method other than the modified eigenmode imperfection mode method,is almost equal to the one with Form4 of bow imperfection.The load-carrying capacity of reticulated shell considered in this study is not sensitive to nodal deviation.关键词
双层焊接球柱面网壳/杆件缺陷/节点偏差/耦合影响/承载力Key words
double-layer cylindrical reticulated shell with welded spherical node/member imperfection/nodal deviation/coupling effect/load carrying capacity分类
建筑与水利引用本文复制引用
肖姚,李会军,韩健..考虑杆件缺陷的双层焊接球柱面网壳稳定性研究[J].建筑钢结构进展,2020,22(5):64-77,92,15.基金项目
National Natural Science Foundation (51408490),the Fundamental Research Funds for the Central Universities (2452020168),Training Programs of Innovation and Entrepreneurship for Undergraduates (201710712046) （51408490）
