荷载列作用下曲线箱梁剪力滞空间有限元分析

Space Finite Element Analysis of Shear Lag in Curved Box Girder Under Series of Load

采用三维有限元仿真技术研究了车辆荷载作用下某城市立交匝道箱梁剪力滞效应。基于ANSYS程序建立钢筋混凝土曲线箱梁空间实体有限元模型,荷载分别考虑2种不同的作用位置和3种不同的移动速度(v=10 m/s、15 m/s、20 m/s),得到了荷载分别沿着内道与外道移动到跨中截面时剪力滞效应分布规律。结果表明:车辆荷载作用下,曲线箱梁翼板剪力滞效应显著,剪滞系数峰值高达3.0;荷载速度和荷载作用位置对曲线箱梁剪力滞效应均有影响,荷载速度对曲线箱梁剪力滞效应较为显著;保持荷载速度不变,荷载作用于内道时曲线箱梁剪力滞效应比荷载作用于外道时更明显。

A three-dimensional finite element simulation technology was used to investigate the shear lag effectof interchange ramp box girder in a city. A finite element model（FEM） of reinforced concrete curved boxgirder was built by using a ANSYS software. By considering three load speeds of 10 m/s,15 m/s and 20 m/sand two load positions,we obtained the distribution law of shear lag effect,where the load following movesalong the inner and outer passages to the cross-section. The result indicated that the effects of vehicle load onthe shear lag of curved box girder were significant,and the maximum shear lag coefficient was 3.0. Both loadspeed and load position had effects on shear lag of curved box girder,and the former had a greater impact.Theshear lag effect of load acting on the inside road was more obvious than that on the outside road when the loadspeed did not changed.