具有初始缺陷的船体加筋板结构在复杂受力状态下的极限强度研究  

Ultimate Strength Study of Stiffened Plate under Complex Loading with Initial Imperfections

作　　者：张婧[1] 施兴华[1,2] 顾学康[2] 

机构地区：[1]江苏科技大学船舶与海洋工程学院,镇江212003 [2]中国船舶科学研究中心,无锡214082

出　　处：《中国造船》2013年第1期60-70,共11页Shipbuilding of China

基　　金：江苏省高校自然科学基金(10KJB58002);江苏高校优势学科建设工程资助项目

摘　　要：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。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.

关 键 词：船体加筋板 极限强度 初始缺陷 复杂受力 

分 类 号：U661[交通运输工程—船舶及航道工程]