Abstract：It is significant to develop the method of multi-scale modeling and damage analyses on structural deteriorating in order to maintain safe and reliable service of long-span bridges. This paper summarize recent works on multi-scale modeling and analyses of long-span bridges for the popurse of evaluating structural deterorating and damage by authors and their research group. The main outcomes include that, the methodology and strategy for concurrent finite element modeling of long-span bridges at the different scale levels have been developed for the purposes of analyses on structural deteriorating. The model updating techniques with concurrent multi-objective and multi-factor optimization technique were developed for concurrently updating the multi-scale model of the bridge. The proposed procedures of multi-scale model modeling, updating and verification were applied to the model verification of Runyang bridges and Tsing Ma Bridge as an actual engineering practice of the proposed procedures. The method of numerically simulating structural deteriorating and damage involution in multiple multiple temporal and spatial scales was developed based on the developed multi-scale model and applied to the analyses on long-span bridges under service loading. At last, it is suggested that, there are some key issues to be studied in the region, such as, how to explain the damage evolution from defects in meso-scale to local fracture and bridge failure, and to develop the theory and analyses method for a trans-scale damage evolution in long-span bridges.
2010, Vol. 31 
