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(北京工業(yè)大學建筑工程學院， 北京 100124)
摘要: 為研究拱形氣肋結構的模態(tài)特征和外部流場附加質量，基于流固耦合勢流理論，建立薄膜充氣管流固耦合模態(tài)有限元模型，以充氣管和內充氣體共同作用理論模型對薄膜充氣管進行干模態(tài)分析，并考慮外部空氣三者共同作用理論模型對薄膜充氣管進行濕模態(tài)分析，根據(jù) ETFE 充氣管試驗結果對有限元模擬方法進行驗證。 對拱形氣肋結構進行干模態(tài)、濕模態(tài)參數(shù)分析，考慮拱形氣肋結構的跨度、直徑、充氣內壓、矢跨比對模態(tài)的影響。 結果表明:隨著氣肋跨度和矢跨比的增加，模態(tài)頻率隨之減小；隨著氣肋直徑和充氣內壓的增加，模態(tài)頻率隨之增加。 在模態(tài)分析的基礎上，進一步分析得到拱形氣肋結構前五階模態(tài)附加質量，并提出前五階模態(tài)附加質量的簡化公式。
關鍵詞: 拱形氣肋結構；勢流體；濕模態(tài)；流固耦合；附加質量；簡化公式
中圖分類號:TU353 文獻標志碼:A 文章編號:1002￣848X(2022)01￣0049￣07
DOI:10. 19701 / j. jzjg. 20200191
Dry and wet modal analysis of air￣inflated arch structure and simplified formulastudy for additional mass
LI Juqing， HE Yanli
(College of Architecture and Civil Engineering， Beijing University of Technology， Beijing 100124， China)
Abstract: In order to analyze the modal characteristics of air￣inflated arch structure and the additional mass of external flowfield， a finite element simulation model for fluid structure interaction modal of pneumatic membrane tube was presentedbased on the FSI ( fluid structure interaction) theory and potential flow theory. And the dry modal analysis of pneumaticmembrane tube was carried out by the theoretical model of the interaction between the inflatable tube and the innerinflatable body. And the wet modal analysis of pneumatic membrane tube was carried out by the theoretical model of theinteraction between the air flow field and the inflatable tube. The finite element simulation method was verified by the ETFEinflatable tube test results. Then， the dry and wet modal parameters of air￣inflated arch structure were analyzed，considering the influence of the span， diameter， inflation internal pressure and rise￣span ratio of air￣inflated arch structureon the mode. The results show that the modal frequency decreases with the increase of air￣inflated span and rise￣span ratio，and increases with the increase of air￣inflated diameter and air pressure. Based on the modal analysis， the additional massof the first five modes of the air￣inflated structure was obtained by further analysis， and the simplified formulas of theadditional mass of the first five modes were put forward.
Keywords:air￣inflated arch structure；potential fluid；wet mode；fluid structure interaction；additional mass；simplifiedformula
第一作者:李居慶，碩士，主要從事于膜結構、風工程研究，Email:2469946601@ qq. com。
[引用本文] 李居慶，何艷麗. 拱形氣肋結構干、濕模態(tài)分析及附加質量簡化公式研究[ J]. 建筑結構，2022，52(1):49￣55. LI Juqing，HE Yanli. Dry and wet modal analysis of air￣inflated arch structure and simplified formula study foradditional mass[J]. Building Structure，2022，52(1):49￣55.
