抄録
The conventional seismic standard specifies that the seismic inertia force acting on a train is modeled as a uniformly-distributed load which has the upper limit force of 30% of railway vehicle weight assuming that railway vehicles produce damping effects or do not always oscillate in the same phase as structures. However, the damping effect has not been specifically identified and the upper limit is unreliable, because actual railway vehicles and structures provide the complicated vibration system. The object of this paper is to evaluate dynamic effects of railway vehicle and concentrated load effects of the moving train on the maximum displacement response of structure during earthquakes, and to develop a reasonable modeling method of running railway vehicle in seismic design. As the result of numerical simulations, it was found out that the dynamic effect of vehicles affects the structure response during earthquakes, and the effect depends on the characteristics of the earthquake, the degree of the plastic behavior of the structure and the yield frequency. The structure response varies in the range of from -50 to 20% due to the dynamic effect of railway vehicles when the weight ratio of the structure to the vehicle is 1. In addition, the concentrated load effect of the moving train significantly increases the structure response in the case where the four wheelsets sandwiching the coupler are placed on the structure at the time of the maximum acceleration of earthquakes as compared to the case assuming train weight to the distributed load, although it is a rare case, and the displacement response varies in a range between -70 and + 100% approximately when the weight ratio of the structure to the vehicle is 1. Finally, an equivalent weight method that can evaluate the dynamic effect of the railway vehicle using the equivalent weight ratio β_<eq> was proposed for enabling a simple and reasonable modeling in practical seismic designs.
