有限元梁格法在斜交空心板计算中的合理性分析

Rationality Analysis on Finite Element Grillage Method in Calculation of Skew Voided Slabs

采用正交网格和斜交网格划分梁格建模方式,利用有限元软件Midas/Civil805分析和比较斜交空心板桥受力情况.通过建模解析两种划分方式对斜交空心板桥在跨径为13m、16m、20m斜交角为15°、30°、45°和活载作用下结构中部弯矩的影响.研究结果表明:斜交网格在斜交角为15°和30°时可以作为划分梁格时较为简便的划分方式;跨径相同时,每根板的受力随斜交角的增大而减小;斜交角相同时,每根板的受力随跨径的增大而增大.这一合理性评估对以后进行类似试验和研究提供相应参考价值和指导意义.

The force conditions of skew voided slabs with finite element software Midas/Civil805 are examined and compared by using two grid partition patterns for grillage modeling, including the orthogonal grids and the oblique grids. The effect of these two patterns on the bending moments in the middle part of the skew voided slab bridges under live loads is viewed when the span is taken as 13m,16m,20m, respectively, with skew angle of 15°, 30°, 45°. The results indicate that the skew grids can be considered as a convenient grid partition pattern when the skew angle is at 15° and 30°, respectively ; the bending moments in each slab would decrease with the increase of skew angle when slab spans are the same, whereas they would increase with the span increasing of each slab beam when the skew angles are the same. Such a rationality evaluation is a valuable reference and contributes the practical significance to the design and study of loading test schemes for similar structures.