【摘要】 为提出宽幅空心板梁桥拓宽后新桥各主梁合理的沉降变形横向分布模式,以京沪高速公路(江苏段)扩建工程中某宽幅空心板简支梁桥为背景进行试验研究与有限元分析。制作1∶4实体缩尺试验模型,监测新旧桥基础沉降差分别为1,2,3mm时新桥各主梁的沉降变形,并利用Origin软件对沉降变形数据进行拟合分析处理;利用MIDAS FEA软件建立全桥体单元有限元模型,进一步分析并拟定该沉降变形横向分布状态的曲线方程。结果表明:宽幅空心板梁桥拓宽时,在新桥基础沉降作用下新桥各主梁的竖向沉降变形横向分布模式与以往假设为线性分布模式时偏差比较大,应予纠正;综合考虑相关性和精度问题,在新桥基础沉降作用下新桥各主梁的沉降变形横向分布模式假定为二阶曲线比较合理。更多还原

【Abstract】 To work out the rational transverse distribution pattern of settlement deformation of main beams of the widened new wide voided slab beam bridge,a simply-supported slab beam bridge of the same kind in the extension project of the Jiangsu Section of Beijing-Shanghai Expressway was taken as an example and the test study and finite element analysis were carried out.The scaled-down test model of 1∶4for the example bridge was prepared.The settlement deformation of the main beams of the new bridge was measured under condition that the foundation settlement differences of the old and new bridges were respectively 1,2and 3mm.The software Origin was used to fit and analyze the data of the settlement deformation,the software MIDAS FEA was used as well to set up the solid finite element model for the whole bridge of the bridge and to further analyze and develop the curve equation for the transverse distribution status of the settlement deformation.The results of the study indicate that in the process of widening of the wide voided slab beam bridge,under the action of the foundation settlement of the new bridge,the transverse distribution pattern of the vertical settlement deformation of the main beams of the new bridge has great differences from the previously assumed linear distribution pattern and the differences should be rectified.In comprehensive consideration of the issues of relevance and accuracy,it will be rational to assume the transverse distribution pattern of the settlement deformation of the main beams to be the quadratic curve.更多还原