Dynamic Effect of Railway Vehicle on Seismic Response of Railway Structure

Abstract eng:
The conventional seismic standard of Japan specifies that the seismic inertia force of trains is modeled as a uniformly-distributed load which has 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 have a complicated vibration system. The object of this paper is to evaluate the dynamic effect of railway vehicles on seismic response of structures, and to develop a reasonable modeling method of railway vehicles in seismic design. As the result of numerical simulations, following conclusions were obtained: 1) The frequency response function of railway vehicles exceeds 1 without phase lag when the frequency is less than about 1Hz, whereas, that marks below 1 with phase lag when the frequency is more than about 1Hz. 2) The frequency response function of the railway vehicles exceeds 1 without phase lag in the range of less than 1Hz, whereas, that marks below 1 with phase lag in the range of higher than 1Hz. 3) The dynamic effect of vehicles affects the structure response under earthquake motions, and the effect depends on the characteristics of earthquakes, the degree of the plastic behavior of structures and the yield frequency. The structure response varies in the range of -50~20% at its maximum due to the dynamic effect. 4) An estimation method using the equivalent weight rate βeq,V was proposed in order to evaluate the dynamic effect of railway vehicles.

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