长挑臂单箱多室宽体箱梁横向受力性能分析

随着城市发展对通行能力要求的提高,高架桥梁中越来越多地采用宽体箱梁结构形式。由于城市景观要求,以及桥下地面道路限制,下部结构常采用单柱或小间距双柱,使得长挑臂单箱多室箱梁部分箱室处于悬臂状态,箱梁横向受力空间效应明显。该文以德胜快速路标准段连续箱梁为研究对象,利用有限元结构程序ANSYS进行空间分析,计算箱梁结构在自重、二期恒载,以及汽车活载作用下横向变形和内力的分布规律,并将空间分析结果与目前简化分析方法进行对比分析,验证简化计算方法的适用性。

Analysis on Transverse Stress Performance of Long-cantilever Single-box Multi-chamber Wide-box Girder

With the improvement of traffic capacity for the urban development,the wide-box girder structure is more and more used in the elevated bridges.Owing to the requirements of urban landscape and the limits of ground roads under bridge,the single-column or small-spaced double-column structure is often used for the substructure to make the partial box chambers of long-cantilever single-box multi-chamber box Girder at the cantilever status,and the transverse stress space effect of box girder is obvious.Taking the continuous box girder of the typical section in Desheng Expressway as the study object,the article analyzes the space by using the finite element structural program ANSYS,calculates the distribution laws of the transverse deformation and the internal force of the box girder structure under the deadweight,two-stage constant load and vehicle live load,and compares and analyzes the space analysis result and the present simplified analysis method,and validates the applicability of the simplified calculation method.