基于预制累积损伤模型的大跨径梁桥损伤响应分析

Damage response analysis of long-span girder bridge based on precast accumulative damage model

针对大跨径PC梁桥建造过程中存在的局部损伤及构件损伤问题,提出预制累积损伤模型及基于此模型的大跨径PC梁桥结构损伤响应分析方法.考虑桥梁施工阶段两种累积损伤效应组合,建立基于预制累积损伤的两类累积损伤工况结构响应模型,对累积损伤导致的梁桥应力和变形状态影响效应做定量和定性分析研究.结果表明,大跨径梁桥在考虑钢筋锈蚀损伤参与组合时,预应力效应损伤引起结构位移明显上拱或下挠;箱梁应力变化影响亦受预应力损伤度控制.

Aimed at the problem of local damage and componential damage occurred in the process of con- struction of large span PC girder bridge, a precast accumulative damage model and an analysis method of structural damage response based on this model were presented for this bridge. Taking into account of combined effect of two kinds of damage case in construction stage, the structural damage response model was built up on the basis of the two kinds of accumulative damage regimes. The effect of the damage case on the stress and deformation of the bridge was researched quantitatively and qualitatively. The results demonstrated that the damage caused by prestressing force in the case of corrosion of steel bar would lead to remarkable arch-up or arch-down. The influence of stress variation in the girder would be controlled by the level of prestressing damage.