子模型技术在混凝土箱梁悬臂板分析中的应用

结合子模型技术,通过大型有限元程序分别建立实体单元模型及板壳单元模型,进行数值仿真分析.研究子模型技术在混凝土箱梁悬臂板实体单元建模分析中的3种方法及实施技巧,考察悬臂板根部内力的影响因素:厚度、长度、箱梁畸变及荷载作用位置.结果表明:子模型区域宽度越接近悬臂板有效分布宽度,子步法和混合网格法计算结果越准确,效率高;对于有效梁段法,3倍于有效分布宽度的梁段为计算精度和计算时效的最佳尺度.实体单元建模综合考虑影响因素,其分析结果相对于板壳单元分析结果及其它算法更接近试验结果,子模型技术适合于混凝土箱梁悬臂板局部精细分析.

Application for Sub -model Technology in Analysis of Concrete Box Bridge Cantilever Plate

Combining the sub-model analysis technology,concrete box bridge cantilever can be carried on simulation analysis with solid and shell elements.In this essay the utility skill and three scheme of the sub-model are studied,meanwhile,influence factors of inner force are generalized.The results indicates that the analysis results for sub step and mixed mesh is effective when the sub-model field is similar to the effective distribution width,in order to get ideal results the length for the girder portion is equal to three times' of the effective width.Comparing to the test results,the analysis results by solid elements determine its applicability and accuracy under the condition of combining the sub-model technology relative to shell elements and other analysis methods.