| In the design situation considering large-scale seismic motion, it is assumed that non-linear and energy-absorbing members are used as part of the structural system. In general, when multiple nonlinear members are generated in a vibration system, response control becomes difficult, so this method is used only in limited cases. However, if the scope of application is clear and the seismic response characteristics can be evaluated appropriately through various verifications through experiments and analyses, it is considered possible to use multiple nonlinear members in combination.
The technical standards applied to Japanese highway bridges allow the design of seismic isolation bridges to be non-linear at two points: the seismic isolation bearings and the base of the piers. However, at present, no general method has been established to evaluate the scope of application and seismic response characteristics for structures where nonlinearity occurs at multiple locations other than seismic isolation bridges.
In particular, it is known that various variability affects the evaluation of the response to large-scale earthquakes, and it is considered essential to consider the variability in the evaluation of the response of a structural system that is nonlinear at multiple locations.
In this paper, we target a bridge with nonlinear piers and bearings, and perform a nonlinear dynamic analysis of a multi-mass frame model that extracts two middle piers of a continuous viaduct. We report the results of the analysis of the effects on the response of the entire bridge system and each member. |
