基于MIDAS/Civil的纤维混凝土对桥梁下挠影响的有限元分析

Finite Element Analysis on Effect of Fiber Concrete on Bridge Down Deflection Based on MIDAS/Civil

以在建三跨连续梁桥为背景,采用通用有限元程序MIDAS/Civil对纤维混凝土梁桥的短期下挠进行仿真分析。以钢纤维、聚丙烯腈纤维为例进行分析,提出了纤维混凝土不同纤维体积率对桥梁下挠的影响规律。通过对主梁不同部位使用纤维混凝土对桥梁下挠影响的对比分析,得到了综合考虑使用性能和经济因素的最佳局部纤维混凝土梁桥方案。

Taking an under-construction three-span continuous bridge as an example, the simulation analysis of short-team down deflection of fiber reinforced concrete beam bridge is carried out by the general finite element program MIDAS/Civil. With the analysis of steel fiber and polyacrylonitrile fiber, the influence law of bridge down deflection with different fiber volume fractions is proposed. Though the comparative analysis of bridge down deflection by using fiber reinforced concrete in different part of main girder, the bestlocal fiber concrete girder bridge scheme is proposed by the comprehensive consideration of service performance and economic factor.