人民黄河
人民黃河
인민황하
Yellow River
2014年
3期
92-95
,共4页
压力钢管%ABAQUS%几何初始缺陷%Riks弧长法%局部稳定
壓力鋼管%ABAQUS%幾何初始缺陷%Riks弧長法%跼部穩定
압력강관%ABAQUS%궤하초시결함%Riks호장법%국부은정
steel penstocks%ABAQUS%initial geometrical imperfection%riks arc-length method%local stability
压力钢管在外压下极易失稳，为了研究环肋加劲压力钢管的屈曲临界载荷，以某二级水电站压力钢管的下平段为例，基于结构屈曲理论，利用有限元软件ABAQUS分析了钢管的线性屈曲情况，在此基础上考虑钢管的大变形及初始缺陷，分析了钢管的非线性屈曲情况。结果表明，有限元法可以合理地考虑加劲环和管壁的相互作用，比规范法、阿姆斯图兹法单独考虑加劲环管段和中间管段的外压稳定更加合理。鉴于加劲环可显著提高压力钢管抗外压稳定能力，还研究了加劲环局部稳定适宜的高厚比，以期为更好地使用规范提供参考。
壓力鋼管在外壓下極易失穩，為瞭研究環肋加勁壓力鋼管的屈麯臨界載荷，以某二級水電站壓力鋼管的下平段為例，基于結構屈麯理論，利用有限元軟件ABAQUS分析瞭鋼管的線性屈麯情況，在此基礎上攷慮鋼管的大變形及初始缺陷，分析瞭鋼管的非線性屈麯情況。結果錶明，有限元法可以閤理地攷慮加勁環和管壁的相互作用，比規範法、阿姆斯圖玆法單獨攷慮加勁環管段和中間管段的外壓穩定更加閤理。鑒于加勁環可顯著提高壓力鋼管抗外壓穩定能力，還研究瞭加勁環跼部穩定適宜的高厚比，以期為更好地使用規範提供參攷。
압력강관재외압하겁역실은，위료연구배륵가경압력강관적굴곡림계재하，이모이급수전참압력강관적하평단위례，기우결구굴곡이론，이용유한원연건ABAQUS분석료강관적선성굴곡정황，재차기출상고필강관적대변형급초시결함，분석료강관적비선성굴곡정황。결과표명，유한원법가이합리지고필가경배화관벽적상호작용，비규범법、아모사도자법단독고필가경배관단화중간관단적외압은정경가합리。감우가경배가현저제고압력강관항외압은정능력，환연구료가경배국부은정괄의적고후비，이기위경호지사용규범제공삼고。
The penstocks are vulnerable to instability under external loads. In order to study the critical buckling value of ring stiffened penstocks ,linear buckling and nonlinear buckling analysis of penstocks were completed by using the finite element software ABAQUS with taking a hydroelec-tric power station penstock as an example in considering the large deformation of the steel penstocks and on the basis of initial imperfection . The re-sults show that the finite element method can reasonably consider interactions with ring stiffener and penstock segment between stiffeners ,and FEM is more reasonable than the specification design method and Amstutz’s approach ,which are separately considering the stability under external pres-sure of ring stiffener and middle pipe segment. In view that the stiffened ring can significantly improve the stability of penstocks,suitable ratio of height to thickness for stiffener is under study,in order to providing reference for using of penstock normative design method.
