考虑正应力空间效应斜拉桥后期荷载状态评估

Real-time Service Load Condition Assessment of Cable-Stayed Bridge Based on a consideration of the Spatial Effect of Stress Distribution

以宁波招宝山大桥为例,介绍了一种新的斜拉桥后期荷载受力状态评估方法.该方法考虑正应力空间效应,在将斜拉桥受力状态评估分为恒载受力状态评估和后期荷载受力状态评估的基础上,建立空间实体模型,得到测点响应理论包络,将其与测点实测响应进行比较来判断结构后期荷载作用下的状态.这种方法基于设计资料、施工资料,应用范围广,并能进行实时监控.

This paper develops a practical and user-friendly approach for real-time service load condition assessment of cable-stayed bridges. In this approach, the spatial effect of stress distribution is considered in the establishment of a 3D solid finite element model, and then the model is used to obtain the stress envelope. The real-time measurement data from the field and the theoretic stress envelope from simulation are used in the assessment of the service load condition. The design and field data are the basis of the assessment and this method can be applied widely in real engineering. A Case study has also been conducted, showing that the detailed procedure of the proposed method and results have advantages over the previous methods.