Numerical analyses

Prediction analysis

By making use of the existing accurate thin-wall steel and CFT column numerical models developed up to the present (Goto et al. 1998, 2006, 2010, 2012), a detailed overall numerical model for the elevated girder bridges was constructed, as illustrated in Fig.4-1. This model can precisely considers the interaction between the piers, bearings and superstructures. After the shaking table test, it is expected that the accuracy of the numerical model will be improve by calibrating the model extensively, based on the experimental data. As a numerical example, a predicted ultimate deformation of the elevated girder bridge model in the shaking table test is schematically shown in Fig.4-2.

Fig.4-1 Overall elevated girder bridge model

a) Elevated girder bridge model with hollow circular piers (270% Tsugaru)

b) Elevated girder bridge model with hollow square piers (250% Tsugaru)

Fig. 4-2 Predicted ultimate deformation of elevated girder bridge model

Input acceleration wave: LG and TR components of the magnified Tsugaru wave observed at the Tsugaru Bridge during the 1983 Nihonkai-chubu earthquake.