受压U肋加劲板局部稳定受力性能数值模拟

发布时间：2019-04-11 07:09

【摘要】：为了掌握受压U肋加劲板的局部稳定受力性能,考虑残余应力与初始几何缺陷,建立U肋加劲板局部稳定试验试件的有限元模型,通过考虑不同宽厚比的试验验证该数值模拟方法的正确性;将U肋加劲板及其腹板简化为四边简支板,并通过数值模拟方法验证四边简支板简化模型的正确性。结果表明:采用数值模拟方法计算得到的破坏模态和应力-位移曲线与试验曲线吻合较好,所计入的残余应力和几何缺陷大小是合理的;采用简化的四边简支板模型和试验试件模型计算的应力-位移曲线从开始到峰值吻合较好,在下降段四边简支板模型下降斜率有所增大;在分析受压U肋加劲板受力性能时,可以选用等效四边简支板简化模型分析其局部稳定承载力。
[Abstract]:In order to master the local stability performance of U-ribbed stiffened plate under compression and considering the residual stress and initial geometric defects, the finite element model of the local stability test specimen of U-ribbed stiffened plate was established. The correctness of the numerical simulation method is verified by experiments considering different width-thickness ratios. The U-rib stiffened plate and its web plate are simplified to four-sided simply supported plate, and the correctness of the simplified model is verified by numerical simulation. The results show that the failure modes and stress-displacement curves calculated by the numerical simulation method are in good agreement with the experimental curves, and the residual stresses and geometric defects are reasonable. The stress-displacement curves calculated by the simplified four-sided simply supported plate model and the test specimen model agree well from the beginning to the peak value, and the decline slope of the four-sided simple-supported plate model increases in the descending section. The simplified model of the equivalent four-sided simply supported plate can be used to analyze the local stability bearing capacity of the U-ribbed stiffened plate under compression.
【作者单位】：福州大学土木工程学院;湖州市交通规划设计院;贵州路桥集团有限公司;
【基金】：国家自然科学基金项目(51478120,51108087)
【分类号】：U441

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