摘要
针对宏观杆系有限元模型和精细化有限元模型在桥梁检测中存在的问题,利用多尺度建模的方法,提出将桥梁检测中控制截面进行精细化建模并通过合理方式连接到整体模型中,建立了可以精细化分析控制截面的多尺度有限元模型.通过矩形截面简支梁验证了多尺度模型中不同单元连接方式的正确性,表明刚性区(CERIG)法在混合单元模型中自动建立约束方程的方法是可行的;并通过3跨等截面连续梁进行实例分析.结果表明:多尺度有限元模型能够更好地描述应力及变形沿桥梁高度和宽度的变化趋势,计算结果更加贴近于实际情况,其在基频计算中也是足够精确的.
Aiming at the problems existing in macro bar system finite element model and finite element model refinement in bridge inspection,making use of multi-scale modeling method,the bridge control section in the detection of fine model and through the reasonable way to connect to the overall model is proposed,which can set up fine analysis,multi-scale finite element model of the control section.The connection modes of different elements in the multi-scale model are verified by a simple beam with rectangular cross section,which shows that the method of rigid zone(CERIG)is feasible to set up the constraint equation automatically in the model of mixed elements.Through an example of a three-span uniform cross-section continuous beam the practical example is analyzed.The results show that the multi-scale finite element model can better describe the variation trend of stress and deformation along the bridge height and width,and the calculation results are closer to the actual situation.The results of fundamental frequency calculation show that the multi-scale finite element model is accurate enough in fundamental frequency calculation.
作者
马万良
MA Wan-liang(Lanzhou Jiaotong University Engineering Testing Co.,Ltd.,Lanzhou 730070,China)
出处
《兰州工业学院学报》
2021年第1期39-43,共5页
Journal of Lanzhou Institute of Technology
关键词
有限元分析
多尺度有限元模型
桥梁检测
应力
挠度
finite element analysis
multiscale finite element model
bridge detection
stress
deflection
