中南大学学报（自然科学版）2024，Vol.55Issue(9)：3505-3519,15.DOI:10.11817/j.issn.1672-7207.2024.09.023
悬浮隧道考虑竖向弹性约束的子结构模型与涡振响应特性
Substructure model considering vertical elastic constraints vortex-induced vibration response characteristics of submerged floating tunnel
摘要
Abstract
The vortex-induced vibration(VIV)of the multi-span cable-supported submerged floating tunnel(SFT)was studied by simplifying the intermediate supporting cables and connected boundary conditions as vertical elastic constraints,as well as by using the wake oscillator to consider the fluid-structure interaction of uniform flow.A substructure model for the SFT tube was established based on the Euler-Bernoulli beam theory,which can consider the influence of intermediate/boundary vertical support stiffness on the VIV characteristics.The distribution laws of VIV response of the tube during the combination of multiple stiffness sets for intermediate supporting cables and boundary constraints were analyzed.The results show that the increase of the two types of stiffness has a suppressive effect on the VIV response.The frequency corresponding to the VIV for the greater stiffness is higher,and it is more difficult to excite the higher-order modes.When the intermediate stiffness is small or large,the VIV response amplitudes near the end positions decrease with the increase of boundary stiffness,and the VIV response amplitudes in spanrange are symmetric about the midpoint.When the intermediate stiffness is medium and the difference of two adjacent frequencies is large,the displacement is dominated by a single mode.However,when the two adjacent ones are very close,the nonlinear phenomena of"depression"and"bulge"caused by mode coupling are observed at the VIV locking interval.The maximum displacement for all intermediate positions is respectively located at the ends and midpoint when the boundary stiffness is respectively small and large.关键词
多跨锚索式悬浮隧道/涡激振动/子结构模型/跨内/边界约束刚度/尾流振子Key words
multi-span cable-supported submerged floating tunnel/vortex-induced vibration/substructure model/intermediate/boundary stiffness/wake oscillator分类
建筑与水利引用本文复制引用
易壮鹏,李宇杰,潘权,桂怡琦,唐新超,刘博..悬浮隧道考虑竖向弹性约束的子结构模型与涡振响应特性[J].中南大学学报（自然科学版）,2024,55(9):3505-3519,15.基金项目
国家自然科学基金资助项目(52278139,52278141) （52278139,52278141）
湖南省自然科学基金资助项目(2022JJ30612) （2022JJ30612）
长沙理工大学土木工程重点学科基金资助项目(18ZDXK05,15ZDXK01)(Projects(52278139,52278141)supported by the National Natural Science Foundation of China （18ZDXK05,15ZDXK01）
Project(2022JJ30612)supported by the National Science Foundation of Hunan Province （2022JJ30612）
Projects(18ZDXK05,15ZDXK01)supported by Key Discipline Funds for Civil Engineering of Changsha University of Science and Technology) （18ZDXK05,15ZDXK01）
