The detailed process of model updating and validating is discussed in terms of reduced scale specimen of the steel box girder in longitudinal stiffening truss of a long span bridge.

• 以实验室的大跨桥梁结构钢箱梁纵向加劲桁架缩尺试样为研究平台，具体讨论了多尺度模型修正和验证的实施过程。