CAJ | 학술논문

采用非线性有限元法对带有初始变形缺陷及受轴向、侧向压力同时作用的复杂受力状态下结构的极限承载力进行研究.通过Smith模型试验并与共同规范给出的逐步破坏计算方法比较,验证了有限元方法的准确性;以基于共同规范设计的典型 AFRAMAX 型双壳油船为研究对象,对多个加筋板模型的比较分析表明,单个双跨加筋板模型(1/2+1/2)可很好地用于结构的极限强度分析.该模型能模拟横向构件对结构纵向强度的影响,且纵向边界条件的设置可以体现多个加筋板结构间的相互影响.在此基础上,对具有初始缺陷且在轴向和侧向压力同时作用下的复杂受力状态下的加筋板结构的极限强度进行分析,并与共同规范法的结果进行比较,表明结构的初始变形缺陷及侧向压力将明显降低其极限承载力,而共同规范极限强度计算法的结果因没有考虑结构的工艺缺陷及真实加载工况而偏于危险.
채용비선성유한원법대대유초시변형결함급수축향、측향압력동시작용적복잡수력상태하결구적겁한승재력진행연구.통과Smith모형시험병여공동규범급출적축보파배계산방법비교,험증료유한원방법적준학성;이기우공동규범설계적전형 AFRAMAX 형쌍각유선위연구대상,대다개가근판모형적비교분석표명,단개쌍과가근판모형(1/2+1/2)가흔호지용우결구적겁한강도분석.해모형능모의횡향구건대결구종향강도적영향,차종향변계조건적설치가이체현다개가근판결구간적상호영향.재차기출상,대구유초시결함차재축향화측향압력동시작용하적복잡수력상태하적가근판결구적겁한강도진행분석,병여공동규범법적결과진행비교,표명결구적초시변형결함급측향압력장명현강저기겁한승재력,이공동규범겁한강도계산법적결과인몰유고필결구적공예결함급진실가재공황이편우위험.
@@@@The ultimate strength of ship stiffened plate with initial distortion imperfections under uniaxial compression and lateral pressure is studied to obtain the real ultimate capacity of structure by the nonlinear finite element method. Comparing the results of Smith’s experiments that was carried out for the structural ultimate strength analysis and the progressive collapse method, the accuracy of nonlinear finite element method is analyzed. The stiffened plate models of a AFRAMAX double hull oil tanker designed by Common Structural Rules are analyzed, from which the one bay model (1/2+1/2) is chosen for the ultimate strength studied. The chosen model can simulate the influence of the transverse on the result, and the longitudinal boundary can model the influence of adjacent panels. The results of structure with initial imperfections under complex loading show that initial imperfections and lateral pressure reduce the ultimate capacity significantly. And the comparison with the results of Common Structural Rules indicates that the Common Structural Rules method is actually over-estimate the structure ultimate strength due to the neglect of the technologic imperfections and the real loading conditions.