西安建筑科技大学学报（自然科学版）
西安建築科技大學學報（自然科學版）
서안건축과기대학학보（자연과학판）
JOURNAL OF XI'AN UNIVERSITY OF ARCHITECTURE & TECHNOLOGY
2010年
1期
47-53
,共7页
南水北调%U型渡槽%流固耦合%压力-位移有限元%结构动力学
南水北調%U型渡槽%流固耦閤%壓力-位移有限元%結構動力學
남수북조%U형도조%류고우합%압력-위이유한원%결구동역학
south-to-north water diversion of china%U shape aqueduct%fluid solid interaction (FSI)%displacement-pressure FEA%dynamic of structure
针对大型U型渡槽槽形特征和抗震设计问题,建立了适于U型渡槽流固耦合(FSI)系统动力分析的位移-压力(u_i,p)有限元格式,给出流固耦合系统的动力特性方程;并基于FSI系统的(u_i,p)格式建立渡槽槽体-水体-槽墩-基础-地基系统的力学模型,采用非对称模态提取法求解了4种水深下渡槽的动力特性,并用隐式-显式积分算法计算了4种水深、2种强震作用下大型渡槽的动力响应.计算结果表明,基于FSI的(u_i,p)格式,考虑到槽体与水体的相互作用,适应曲边FSI边界条件.简化了计算模型,提高了计算精度,同时也得出不同水深、不同激励下渡槽结构动力特性和动力响应的变化规律等结论,可为大型渡槽及同类工程抗震设计提供参考.
針對大型U型渡槽槽形特徵和抗震設計問題,建立瞭適于U型渡槽流固耦閤(FSI)繫統動力分析的位移-壓力(u_i,p)有限元格式,給齣流固耦閤繫統的動力特性方程;併基于FSI繫統的(u_i,p)格式建立渡槽槽體-水體-槽墩-基礎-地基繫統的力學模型,採用非對稱模態提取法求解瞭4種水深下渡槽的動力特性,併用隱式-顯式積分算法計算瞭4種水深、2種彊震作用下大型渡槽的動力響應.計算結果錶明,基于FSI的(u_i,p)格式,攷慮到槽體與水體的相互作用,適應麯邊FSI邊界條件.簡化瞭計算模型,提高瞭計算精度,同時也得齣不同水深、不同激勵下渡槽結構動力特性和動力響應的變化規律等結論,可為大型渡槽及同類工程抗震設計提供參攷.
침대대형U형도조조형특정화항진설계문제,건립료괄우U형도조류고우합(FSI)계통동력분석적위이-압력(u_i,p)유한원격식,급출류고우합계통적동력특성방정;병기우FSI계통적(u_i,p)격식건립도조조체-수체-조돈-기출-지기계통적역학모형,채용비대칭모태제취법구해료4충수심하도조적동력특성,병용은식-현식적분산법계산료4충수심、2충강진작용하대형도조적동력향응.계산결과표명,기우FSI적(u_i,p)격식,고필도조체여수체적상호작용,괄응곡변FSI변계조건.간화료계산모형,제고료계산정도,동시야득출불동수심、불동격려하도조결구동력특성화동력향응적변화규률등결론,가위대형도조급동류공정항진설계제공삼고.
Aimed at geometrical features and seismic design issues of large U-aqueduct, the finite element formulation of fluid solid interaction (FSI) system were established in this paper based on the formulation of displacement and pressure degree of freedom (u_i,p), which were suitable for the dynamic issues of large U-aqueduct. At the same time, the dynamic nature properties equation of FSI system and the dynamic analysis model of the large U-aqueduct, which includes aqueduct body, water, pier of aqueduct, foundation and ground system based the formation (u_i,p) of FSI system, were founded. Considering four depth of water in the aqueduct, the dynamic nature properties of the aqueduct was obtained by using unsymmetic algorithm, and the dynamic response of the large aqueduct under the two action of dynamic loads was also calculated by adopting the implict-explict integration algorithm. The calculated results indicated that the FEA formulation of FSI system based on the formulation (u_i,p), which considered the interaction between aqueduct body and water in aqueduct, simplified the calculated model and improved the calculation accuracy. And the conclusion of the variation law of the dynamic stress and dynamic displacement of the aqueduct structure under different quantities of discharge is also drawn. These conclusions may provide theoretical reference for the dynamic design work in the similar engineering.
