基于管养数据的箱梁桥病害分析及监测指标的选取

Disease Analysis and Monitoring Index Selection of Box Girder Bridge Based on Pipe Data

本文首先分析了江苏省公路桥梁的病害信息,根据病害的分布特征确定组合箱梁的病害发生的主要构件是梁体,主要病害是裂缝,将底板横向裂缝、腹板竖向裂缝、翼板横向裂缝作为代表裂缝,并针对这三种裂缝选择中性轴指标作为监测指标。使用ANSYS建立箱梁模型,研究当跨中截面出现代表裂缝时对截面中性轴指标的影响。研究发现三种代表裂缝的长度和深度均会影响截面的中性轴指标,中性轴指标有作为组合箱梁裂缝的监测指标的潜力。

This paper first analyzes the disease information of highway Bridges in jiangsu province,and according to the distribution characteristics of the disease,determines that the main component of the composite box girder is the beam body,and the main disease is the crack.The transverse crack of the bottom plate,the vertical crack of the web and the transverse crack of the wing plate were taken as the representative cracks,and the neutral axis index was selected as the monitoring index for the three kinds of cracks.ANSYS was used to establish the box girder model to study the influence of representative crack on the neutral axis of cross section.It is found that the length and depth of the three representative cracks will affect the neutral axis index of the section,which has the potential to be used as the monitoring index of the composite box girder cracks.